Basic concepts: molecular biology, DNA, RNAs, chemical bonds, importance of water, chemical reactions, organic compounds, carbohydrates, lipids, cholesterol, proteins, amino acids, fats, steroids, emulsifiers, etc.

Disclaimer: While every reasonable effort is made to ensure that the information provided is accurate, no guarantees for the currency or accuracy of information are made. It takes several proof readings and rewrites to bring the quiz to an exceptional level. If you find an error, please contact me as soon as possible. Please indicate the question ID-Number or description because server may randomize the questions and answers.

Go to: Midterm I | Midterm II | Final Exam

Biology 205 (BIOL 205-UCAL) Midterm III

Some questions have hints and explanations. Click Start to begin.

Start

Congratulations - you have completed Biology 205 (BIOL 205-UCAL) Midterm III.

You scored %%SCORE%% out of %%TOTAL%%. With incorrect multiple attempts your score is %%PERCENTAGE%%

Your performance has been rated as %%RATING%%

Your answers are highlighted below.

Question 1

What is chemotaxis? (ID-B03-64)

A	A digestive process used by herbivorous to break down the plant cells.
B	Production of proteins by the bone marrow to keep stable white blood cell count.
C	Process in which chemical difference between inside and outside the cell is maintained.
D	Movement of an organism in response to a chemical stimulus.

Question 1 Explanation: 

This is how Bacteria sense food.

Question 2

What is the function of flagella on prokaryotic cells? (ID-B03-59)

A	Protection from the outside environment.
B	DNA and RNA replication.
C	Locomotion.
D	Enzyme and proteins synthesis.
E	Provide structural support.

Question 3

How many different nitrogenous bases that made up of DNA structures? (ID-B03-39)

A	5
B	2
C	4
D	3
E	6

Question 4

How many different types of White Blood Cells (WBCs) have been identified? (ID-B03-87)

A	6
B	2
C	4
D	3
E	5

Question 5

An unknown element has 6 protons and 8 neutrons. Which of the following element is most likely fit this atomic description? (ID-B03-05)

A	Helium-4
B	Nitrogen-12
C	Carbon-13
D	Carbon-14
E	Carbon-12

Question 5 Explanation: 

By calculating the atomic mass number with the given data, the ONLY possible answer is Carbon-14.

Question 6

With the development of advanced microscopes, why would you still use a light microscope? (ID-B03-54)

A	Light microscopes are cheaper for a biologist to obtain.
B	The techniques used to study microscopic particles in cell biology has not changed since 1665.
C	Movement of organic material is magnified in advanced microscopes hence harder to study.
D	There is a world wide shortage of advanced microscopes.

Question 7

Which of the following occur during a chemical reaction? (ID-B03-11)

A	Produce molecules and compounds with polarity. Hint: Not always, but sometimes.
B	Neutrons and protons from different atoms react with each other.
C	Number of electrons within the structure increases. Hint: Not always, but sometimes.
D	Valance shell electrons react with other atoms to form bonds.

Question 8

Which of the following statement is incorrect about RNA? (ID-B03-42)

A	Only the tRNA structure is linear.
B	The tRNA carries amino acids with high energy bound for making proteins.
C	Only the mRNA structure is linear.
D	Coding of the proteins is done by mRNAs.

Question 9

Arrange the following chemical groups diagrams from Hydroxyl, Carbonyl, Carboxyl, Amino, Phosphate and Methyl in that order. (ID-B03-75)

Suggestion: Take your time to answer this question. It can be confusing with 6 types!

A	IV , VI , III , II , V and I
B	I , III , IV , V , II and VI
C	IV , I , VI , V , II and III
D	VI , IV , III , II , V and I
E	VI , IV , II , V , III and I
F	IV , VI , II , III , V and I

Question 10

All living things are composed of cells and that all cells come from other cells. What is this statement describing? (ID-B03-84)

A	Laws of inheritance
B	Molecular theory
C	Theory of evolution
D	Cell theory
E	Genetic theory

Question 11

The ___ is the site where ribosomal RNA (rRNA) is transcribed and where ribosomes are assembled. (ID-B03-74)

A	Golgi apparatus
B	Vesicles
C	Nucleolus
D	Centriole
E	Rough endoplasmic reticulum

Question 12

Proteins are bonded by __I__ and these linking bounds are known as __II__. (ID-B03-33)

A	I. ionic bonds II. nucleic bonds
B	I. ionic bonds II. peptide bonds
C	I. covalent bonds II. peptide bonds
D	I. covalent bonds II. nucleic bonds

Question 13

The chitin is a ____ and it is used by insects and crustaceans to build their exoskeleton. (ID-B03-35)

A	monsaccharide
B	lipid
C	protein
D	disaccharide
E	polysaccharide

Question 14

Which of the following integral membrane protein in Red Blood Cells (RBCs) provide gel-like barrier outside the cell? (ID-B03-89)

A	Ankrin protein
B	Glycophorin protein
C	Spectrin protein
D	Band 3 protein
E	Aquaporins protein

Question 15

If you want to increase the internal temperature of Canadian moose dung while cooking, what should you do? (ID-B03-16)

Note: Moose dung is a traditional Canadian delicacy. Yum yum 🙂

A	Decrease the humidity of the cook pot.
B	Increase the humidity of the cook pot.
C	Freeze the dung before cooking.
D	Add salts, ionic compounds, to the moose dung.

Question 16

Which of the following statement is correct about microfilaments in the cytoskeleton? (ID-B03-68)

A	They are only found in plant cells because animal cells with movement cannot maintain the structure.
B	They made the various fiberous proteins of α-helical coiled-coils that transport materials from one area to another.
C	They are composed of action and involved in cell movement and maintaining cell structure.
D	They are composed of globular proteins that are assembled and disassembled in different regions of the cell to form hollow pathways.

Question 17

You take a spoon full of cocoa powder and mix it in milk. Assuming no isolated reactions occurred, which of the statement is most likely describes your cocoa milk shake? (ID-B03-17)

A	The temperature of the mixture should have increased as the mixing progresses.
B	The mixing of the two most likely have broken down the molecular bounds of water and that resulted in reaction with cocoa powder.
C	Milk is the solvent while cocoa powder is the solute.
D	The milk acted as the solute which breaks down the chemical compounds in the cocoa powder.

Question 18

Isotopes of same element have different amounts of what subatomic particle(s)? (ID-B03-73)

A	Electrons
B	Protons and Electrons
C	Protons and Neutrons
D	Protons
E	Neutrons

Question 18 Explanation: 

Example; the Carbon-12 have 6 neutrons while Carbon-14 has 8. But both have exactly same amount of protons and if they are not at a charged state, same amount of electrons as well.

Question 19

Living cells have the amazing ability to distinguish different isotopes of the same element. (ID-B03-09)

A	True
B	False

Question 20

Polymers are broken down to monomers by what process? (ID-B03-79)

A	Hydrolysis
B	Protein pumps
C	ATP injection
D	Heating

Question 21

How many different amino acids are found in proteins? (ID-B03-36)

A	20
B	35
C	100
D	50
E	Millions

Question 22

A solution at pH 6 contains ___ than the same amount of solution at pH 4. (ID-B03-20)

A	10 times less H+
B	10 times more H+
C	100 times more H+
D	2 times more H+
E	100 times less H+

Question 22 Explanation: 

pH = -log₁₀[H⁺]
[H⁺] = 10^-pH

Question 23

Organic chemical reactions takes place... (ID-B03-76)

A	...always outside cell walls.
B	...in aqueous environment of cells.
C	...only by breaking covalent bonds because living cells cannot break down ionic bonds.
D	...by heating the reactants.

Question 24

Plants store polysaccharides as what compound? (ID-B03-30)

A	Starch
B	Carboxylic acids
C	Cellulose
D	Glycogen

Question 25

Which of the following statement is correct about vacuoles in Endomembrane System? (ID-B03-70)

A	They process materials and produce usable energy for eukaryotic cells.
B	In plants, they store toxins to protect them from predators.
C	They are the transport vesicles that deliver glycoprotein from ER membrane to Golgi apparatus.
D	In humans, they acts as the digestive compartments within cells.

Question 26

What is good for human health? (ID-B03-47)

A	More triglycerides within the lipoprotein, hence away from the blood.
B	More cholesterol within the lipoprotein, hence away from the blood.
C	A very high LDL to HDL ratio.
D	A very low LDL to HDL ratio.

Question 26 Explanation: 

Medical professionals do not measure the LDL or HDL levels when testing for cholesterol. They test the ratio of LDL/HDL. HDL is good for health and therefore lower the ratio, even if it very high, better it is for the body.

Question 27

What criterion is used to classify an element as "trace element" in humans by Biologists? (ID-B03-71)

A	The elemental abundance must be less than 0.1% of the human body weight.
B	The elemental abundance must be less than 0.01% of the human body weight.
C	The elemental abundance must be less than 0.2% of the human body weight.
D	The elemental abundance must be less than 0.4% of the human body weight.
E	The elemental abundance must be less than 1.0% of the human body weight.

Question 28

The fimbriae of a typical prokaryotic cell has what purpose? (ID-B03-60)

A	Locomotion.
B	Isolation from the outside; like a cell wall.
C	Facilitate active transport and diffusion.
D	Attaching to host surfaces.

Question 28 Explanation: 

It is composed of β-sheet type proteins with a sticky end.

Question 29

What is the length range (size range) for most animal and plant cells? (ID-B03-53)

A	10 to 100 micrometres
B	1.0 to 10 micrometres
C	0.1 to 1.0 micrometres
D	100 to 1000 micrometres

Question 30

What is the relative size of a typical eukaryotic cell? (ID-B03-58)

A	1/100th of a typical prokaryotic celll.
B	1/10th of a typical prokaryotic celll.
C	1/50th of a typical prokaryotic celll.
D	1/30th of a typical prokaryotic celll.
E	1/25th of a typical prokaryotic celll.

Question 31

What is the function of mitochondria in animal cells? (ID-B03-61)

A	Provide structural support for the nucleus.
B	Manufacture and distribution of molecules.
C	Genetic control of the cell.
D	Provide structural support for the cell wall.
E	Energy processing.

Question 31 Explanation: 

In plants, this function is carried out by chloroplasts.

Question 32

Alberta has considerable deposits of Uranium. What cancer causing gas is produced as a result of Uranium decay? (ID-B03-10)

A	Natural gas
B	Sulfur mustard gas
C	Thorium gas
D	Radon gas

Question 33

What type of blood cells are formed in a process called erythropoiesis? (ID-B03-69)

A	Serum
B	Red blood cells
C	Platelets
D	White blood cells

Question 34

Higher the electronegativity, ... (ID-B03-12)

A	...higher the radioactivity of the atom.
B	...lower the radioactivity of the atom.
C	...higher the pull of electrons towards its nucleus.
D	...more stable the atom.
E	...lower the pull of electrons towards its nucleus.

Question 35

Fats come from animals are generally... (ID-B03-44)

A	...contain more nutrition than plant based fats.
B	...unsaturated fats.
C	...good for human health/digestive system.
D	...solid at room temperature.

Question 36

What are the general parts of a nucleotide? (ID-B03-83)

A	5-carbin sugar, phosphate group and a adenine Hint: While it is true a adenine can be one, it is not a general part!
B	3-carbin sugar, phosphate group and a nitrogenous base
C	3-carbin sugar, phosphate group and a adenine
D	5-carbin sugar, phosphate group and a nitrogenous base

Question 37

Only the ionic compounds will effectively dissolve in water. (ID-B03-18)

A	False
B	True

Question 37 Explanation: 

Water can dissolve ionic compounds and polar molecules.

Question 38

Lactose intolerant is caused due to lack of lactase enzyme, which hydrolyse what glycosidic bonds? (ID-B03-26)

A	β−1-->4
B	α−1-->1
C	β−1-->1
D	α−1-->4

Question 39

A person who consumes a lot of fructose most likely experience... (ID-B03-27)

A	...obesity.
B	...diabetes.
C	...high cholesterol.
D	...thyroid problems.

Question 39 Explanation: 

Fructose that usually found in HFCS (corn syrup) increases the production of fats. Fructose does not give rise to an insulin response.

Question 40

The phospholipids that form the plasma membrane allow non-polar molecules such as oxygen to move across the cell membrane. How is the ionic and polar molecules move across the membrane? (ID-B03-56)

A	The difference in pH levels inside and outside the cell facilitates movement of ionic and polar molecules.
B	Transport proteins form channels which allow ions and polar molecules to move across.
C	Receptor proteins codes the ionic and polar molecules so that it will be accepted by the phospholipids.
D	Simple diffusion process.

Question 41

Why do manufactures use corn syrup derive fructose over glucose? (ID-B03-80)

A	There is more fructose naturally in corn syrup.
B	Fructose is cheaper than glucose.
C	Fructose is a polymer while glucose is a monomer.
D	Fructose is sweeter than glucose.

Question 42

What theory state that mitochondria and plastids, including chloroplasts, originated as prokaryotic cells engulfed by a host cell? (ID-B03-85)

A	Genetic theory
B	Endosymbiont theory
C	Theory of inheritance
D	Cell theory

Question 43

Hydrogen ion (H⁺) and hydroxide ion (OH^-) are highly reactive. They play a major role in what process? (ID-B03-19)

A	Hydrogen bonding
B	Acid-base reactions
C	Chemical precipitation reactions
D	Vital hormone producing reactions

Question 44

Which of the following class of biological molecules is responsible for the structure of water insoluble membranes? (ID-B03-23)

A	Proteins
B	Lipids
C	Nucleic Acids
D	Carbohydrates

Question 45

What is the most abundant organic compound on Earth? (ID-B03-31)

A	Chitin
B	Glycogen
C	Starch
D	Cellulose
E	Lipids

Question 46

The H-bonding networks in proteins is at what level of structure? (ID-B03-34)

A	Secondary structure
B	Primary structure:
C	Quaternary structure
D	Tertiary structure

Question 47

Which of the following that both prokaryotic and eukaryotic cells have? (ID-B03-57)

A	Organelles
B	Nucleus
C	Cell walls
D	DNA as genetic materials

Question 47 Explanation: 

Note all prokaryotic cells have cell walls.

Question 48

Why is the area/volume ratio has to be very small for biological cells to survive? (ID-B03-55)

A	To be able to stack together to form tissues.
B	To be able to communicate to the outside world.
C	To allow nutrients and gasses to pass across the cell surface.
D	To be able to process food and data.

Question 48 Explanation: 

Bit of tricky question because you may argue for few other answers listed above. However, there is a specific reason and that's what this question is asking for.

Question 49

Where are the hydrophilic and hydrophobic structures located on the following phospholipid diagram respectively? (ID-B03-48)

Image mod from: http://commons.wikimedia.org/wiki/File:0301_Phospholipid_Structure.jpg

A	I and IV
B	III and I
C	I and III
D	IV and I
E	III and IV

Question 50

What is the atomic mass number of 14
6 C? (ID-B03-04)

A	14
B	6
C	7
D	8

Question 51

During cell reproduction, chromatin fibers coil up into __I__ structures and when the cell is not dividing, chromatin fibers are in structures called __II__. (ID-B03-65)

A	I. chromosomes II. chromatin
B	I. chromosomes II. ribosomes
C	I. lysosomes II. nucleoli
D	I. ribosomes II. nucleoli
E	I. ribosomes II. lysosomes

Question 52

Which of the following hydrocarbon that has a cyclic (ring) structure? (ID-B03-78)

A	Ethane
B	Butane
C	Benzene
D	Methane

Question 53

Chemically why water is important to life? (ID-B03-14)

A	Very high electron transfer rate and high electrical conduction rate.
B	The chemical properties such as high cohesion and polarity.
C	Very high reaction rate.
D	The physical properties such as very low angles between the two H-atoms and the O-atom.

Question 54

What is the difference between temperature and heat? (ID-B03-15)

A	Heat is the amount of energy associated with movement of atoms while temperature is the intensity of heat (average speed of atoms).
B	Temperature is the amount of energy associated with movement of atoms while heat is the intensity of heat (average speed of atoms).
C	Heat is produced through instantaneous reactions such as boiling water. Temperature is the quantitative measurement of heat.
D	Temperature is a long term quantitative measurement of energy while heat is a short term measurement of energy.

Question 55

Atoms are split/sub-divided into how many subatomic particles? (ID-B03-07)

A	Two subatomic particles.
B	Five subatomic particles.
C	Three subatomic particles.
D	Hundreds of subatomic particles.

Question 55 Explanation: 

Although we have identified more than hundreds of subatomic particles, there are three important ones; Protons, Neutrons and Electrons. Read more at Wikipedia

Question 56

What is the abundance of most stable isotope of carbon, the Carbon-12, in nature? (ID-B03-08)

A	75%
B	50%
C	99%
D	65%
E	100%

Question 57

Which of the following statement is true about enzymes? (ID-B03-81)

A	They slow down chemical reaction by participating in the reaction.
B	They speed up chemical reactions without participating in the reaction.
C	They slow down chemical reaction by acting as a buffer.
D	They speed up chemical reactions by participating in the reaction.

Question 58

A Carbon-14 atom (atomic number 6) that has lost an electron. What is the number of electrons remains? (ID-B03-72)

A	8 electrons.
B	5 electrons.
C	13 electrons.
D	10 electrons.
E	5 electrons.

Question 58 Explanation: 

Atomic number represents protons (+). A neutral atom will have equal number of protons (+) and electrons (-). If an electron is lost, then it must have one less electron than the atomic number.

Question 59

Which of the following statements are true about protein structure? (ID-B03-82)

A	Some proteins only have α helix structures while others can have only β pleated sheet structures.
B	Hydrogen bonds are primary structures of proteins.
C	Protein structures have four levels of structures.
D	The α helix and the β pleated sheet structures are tertiary structure.

Question 59 Explanation: 

Note: Only some proteins have four levels while most have three levels of structures.

Question 60

There are ___ elements essential to life and the four most abundant includes hydrogen, oxygen, carbon and ___. (ID-B03-01)

A	15, iron
B	15 , nitrogen
C	25 , nitrogen
D	15 , sodium
E	22 , iron
F	22 , sodium

Question 61

Which of the following components/substances are present in Red Blood Cells (RBCs)? (ID-B03-88)

A	Ribosomes, organelles and hemoglobin.
B	Ribosomes, plasma membrane and hemoglobin.
C	Nucleus, ribosomes and hemoglobin.
D	Plasma membrane and hemoglobin.
E	Nucleus, plasma membrane and hemoglobin.

Question 61 Explanation: 

Red Blood Cells do not have nucleus, organelles or ribosomes.

Question 62

DNA is made in a process called __I__ while RNA is made in a process called __II__. (ID-B03-24)

A	I. transcription II. translation
B	I. replication II. transcription
C	I. translation II. transcription
D	I. translation II. replication
E	I. transcription II. replication
F	I. replication II. translation

Question 63

Association of multiple polypeptides are often found in what level of protein structure? (ID-B03-37)

A	Secondary structure
B	Primary structure
C	Quaternary structure
D	Tertiary structure

Question 64

Which of the following would you expect to observe on a person who is suffering from long term drug abuse? (ID-B03-66)

A	Increase production in glycoprotein.
B	Increase in rough endoplasmic reticulum.
C	Decrease production in glycoprotein.
D	Increase in smooth endoplasmic reticulum.

Question 65

Which of the organic compounds illustrated below has a double bond? (ID-B03-21)

Image mod from: http://en.wikipedia.org/wiki/Ethyl_group

A	III only
B	I, II and IV
C	II and IV
D	IV only
E	I only
F	II only

Question 66

Fundamentally, functions of proteins are determine by... (ID-B03-32)

A	...the type of translation.
B	...water solubility level.
C	...their orientation of the hydrogen atoms.
D	...their chemical structures.

Question 67

Which of the following statement is correct about saturated fats? (ID-B03-43)

A	They have the maximum number of hydrogens (alkanes) in the fats and lipid group.
B	They have kinks caused by double bonding of carbon atoms.
C	Compared to unsaturated fatty acids, they have a very high melting point.
D	They are often found in olive oil and vegetable oils.

Question 68

Choose the correct statement(s) from the following list. (ID-B03-13)

I. Covalent bonds are stronger than ionic bonds.
II. Chemical reactions always result in loss of electron(s).
III. Water is slightly polar.
IV. Ionic bonds are bound together with oppositely charged ions.

A	All of the above statements are correct.
B	I , II and III
C	II and IV
D	I , III and IV
E	I and III
F	I and II

Question 69

Iodine (I) is an essential trace element used to produce hormones by which gland? (ID-B03-06)

A	Salivary gland
B	Prostate gland
C	Pineal gland
D	Thyroid gland
E	Pituitary gland

Question 70

Cytoskeleton is composed of... (ID-B03-62)

A	...Microtubule, Intermediate filament and Microfilament.
B	...Lysosome and Centriole.
C	...Plasma membrane, Ribosomes and Lysosome.
D	...Ribosomes, Lysosome and Centriole.
E	...Centriole, Golgi apparatus and Ribosomes.

Question 71

Cells are the simplest collection of matter that can live. We use microscopes to study them. Which microscope would you use if you were to study intracellular structures? (ID-B03-52)

A	Light Microscope (LM)
B	Electron Microscope (EM)
C	Transmission Electron Microscope (TEM)
D	Scanning Electron Microscope (SEM)

Question 72

Which of the following statement is correct about DNA double helix? (ID-B03-40)

A	The base A pairs with base T while base G pairs with base T to form a double helix RNA.
B	The base A pairs with base C while base G pairs with base T to form a double helix DNA.
C	The base A pairs with base G while base C pairs with base T to form a double helix RNA.
D	The base A pairs with base C while base G pairs with base T to form a double helix RNA.
E	The base A pairs with base G while base C pairs with base T to form a double helix DNA.
F	The base A pairs with base T while base C pairs with base G to form a double helix DNA.

Question 73

Which of the following is the functional group of fatty acids? (ID-B03-90)

A	Amino group
B	Carboxyl group
C	Carbonyl group
D	Hydroxyl group
E	Phosphate group

Question 74

What is the primary function of RNAs? (ID-B03-45)

A	Develop new genetic codes for evolutionary adaptations.
B	Carry information of amino acid sequence from the genes to make proteins in cells.
C	Provide energy for the DNA structure by converting energy from cells into ATP and transferring it to the nucleus.
D	Protect the nucleus from genetic mutations, even though this always does not work.

Question 75

How is nitrogenous bases of RNA differ from that of DNA? (ID-B03-38)

A	RNA has Thymine (Thy) nitrogenous base instead of Cytosine (Cyt).
B	RNA has Thymine (Thy) nitrogenous base instead of Adenine (Ade).
C	RNA has Adenine (Ade) nitrogenous base instead of Cytosine (Cyt).
D	RNA has Cytosine (Cyt) nitrogenous base instead of Adenine (Ade).
E	RNA has Guanine (Gua) nitrogenous base instead of Cytosine (Cyt).
F	RNA has Uracil (Ura) nitrogenous base instead of Thymine (Thy).

Question 76

Which of the following is a polysaccharide? (ID-B03-28)

A	Glucose
B	Fructose
C	Cellulose
D	Maltose

Question 77

Communication between cells is maintained through allowing molecules to flow by what type of cell junctions? (ID-B03-67)

A	Gap junctions
B	Anchoring junctions
C	Membrane junctions
D	Tight junctions
E	Messenger junctions

Question 78

Why dissolution of CO₂ in ocean water result in ocean acidification? (ID-B03-77)

A	Because CO2 reacts with calcium to produce bicarbonate.
B	Because CO2 reacts with water to produce carbonic acid.
C	Because CO2 acts as a low pH buffer.
D	Because CO2 is an acid.

Question 79

Cell walls of bacteria is made up of what material? (ID-B03-63)

A	Peptidoglycan
B	Chitin
C	Glucose
D	Flagella

Question 80

Which of the following statement is true about monosaccharides? (ID-B03-25)

A	Most common two; glucose forms 5 membered structures while fructose forms 6 membered structure.
B	Their molecular formulas are usually multiples of CH2O2.
C	They usually characterized by three double bonded C-O structures.
D	They often form ring structures.

Question 81

What type of cell junction in animal cells provide the similar function as plasmodesmata in plant cells? (ID-B03-86)

A	Tight junctions
B	Anchoring junctions
C	Gap junctions
D	Fiber junctions

Question 82

The classification organic compounds is based on the presence of what elements? (ID-B03-03)

A	Carbon, Oxygen and Nitrogen
B	Hydrogen and Oxygen
C	Hydrogen, Carbon and Oxygen
D	Hydrogen, Oxygen and Nitrogen
E	Carbon and Hydrogen
F	Nitrogen and Oxygen

Question 83

How many different RNAs are discovered by biologists? (ID-B03-41)

A	3
B	5
C	4
D	2

Question 83 Explanation: 

They are mRNA, tRNA and rRNA.

Question 84

What is a chemical buffer? (ID-B03-49)

A	A substance that increase the pH level of a high pH solution while decrease the pH level of a low pH solution.
B	A substance that prevent changes in pH by accepting or donating hydrogen irons.
C	A substance that resists genetic mutations.
D	A substance that resists changes in pH by accepting or donating hydrogen irons.
E	A substance that prevent genetic mutations.

Question 85

Which of the following statement is true about biological cells? (ID-B03-51)

A	Biological cells have the ability to differentiate Carbon-12 from Carbon-14.
B	Majority of organic cells lacks nucleus.
C	Both animal and plant cells contains materials that move around (mobile).
D	Natural carbon is only produced by plant cells.
E	Only the animal cells that have materials that move around (mobile).

Question 86

The surface tension of water is vital to organisms. Why does water has high surface tension? (ID-B03-50)

A	The hydrogen bonds.
B	The high atomic mass.
C	Low radioactivity and polarity.
D	The very high electronegative nature of the molecule.

Question 87

All of the following chemical groups are hydrophilic except, (ID-B03-22)

A	Carbonyl group
B	Hydroxyl group
C	Phosphate group
D	Carboxyl group
E	Amino group
F	Methyl group

Question 88

What is the major function of phospholipids? (ID-B03-46)

A	Energy storage and release.
B	Synthesis of Amino acids, DNA and RNA.
C	Forms cell membranes.
D	Signaling molecules for sex hormones.

Question 89

How is lipids different from other large biological molecules? (ID-B03-29)

A	They are nonploar and therefore hydrophilic.
B	They do not form polymers.
C	They can form many different shapes with random orientations.
D	They are the largest biological molecules.

Question 90

What is the difference between a compound and a molecule? (ID-B03-02)

A	Compounds composed of two or more different elements while molecules composed of two or more atoms.
B	All organic matter is compounds while molecules are inorganic.
C	Molecules are always ionic while compounds could be either ionic or covalent.
D	Molecules easily react with organic matter therefore they often involved in chemical reactions. Compounds are stable entities and are often inert.
E	Molecules composed of two or more different elements while compounds composed of two or more atoms.

Once you are finished, click the button below. Any items you have not completed will be marked incorrect. Get Results

There are 90 questions to complete.

←

List

→

Return

Shaded items are complete.

1	2	3	4	5
6	7	8	9	10
11	12	13	14	15
16	17	18	19	20
21	22	23	24	25
26	27	28	29	30
31	32	33	34	35
36	37	38	39	40
41	42	43	44	45
46	47	48	49	50
51	52	53	54	55
56	57	58	59	60
61	62	63	64	65
66	67	68	69	70
71	72	73	74	75
76	77	78	79	80
81	82	83	84	85
86	87	88	89	90
End

Return

You have completed

questions

question

Your score is

Correct

Wrong

Partial-Credit

You have not finished your quiz. If you leave this page, your progress will be lost.

Correct Answer

You Selected

Not Attempted

Final Score on Quiz

Attempted Questions Correct

Attempted Questions Wrong

Questions Not Attempted

Total Questions on Quiz

Question Details

Results

Date

Score

Hint

Time allowed

minutes

seconds

Time used

Answer Choice(s) Selected

Question Text

All done

Need more practice!

Keep trying!

Not bad!

Good work!

Perfect!

You may download this exam as a PDF file here

If you get a question wrong, you can still click on the other answers. This will open up hints and explanations (if available), which will provide additional information.