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.

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Biology 205 (BIOL 205-UCAL) Midterm III

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Question 1

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

A	False
B	True

Question 2

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

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

Question 3

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 4

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

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

Question 4 Explanation: 

pH = -log₁₀[H⁺]
[H⁺] = 10^-pH

Question 5

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 sweeter than glucose.
C	Fructose is a polymer while glucose is a monomer.
D	Fructose is cheaper than glucose.

Question 6

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

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

Question 7

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

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

Question 7 Explanation: 

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

Question 8

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

A	False
B	True

Question 8 Explanation: 

Water can dissolve ionic compounds and polar molecules.

Question 9

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

Question 10

What is chemotaxis? (ID-B03-64)

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

Question 10 Explanation: 

This is how Bacteria sense food.

Question 11

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 11 Explanation: 

Note all prokaryotic cells have cell walls.

Question 12

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

Question 13

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

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

Question 14

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

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

Question 14 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 15

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

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

Question 16

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

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

Question 17

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

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

Question 18

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

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

Question 18 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 19

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

A	Glycogen
B	Starch
C	Carboxylic acids
D	Cellulose

Question 20

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

A	Lipids
B	Glycogen
C	Cellulose
D	Starch
E	Chitin

Question 21

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

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

Question 22

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

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

Question 23

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

Question 23 Explanation: 

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

Question 24

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

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

Question 24 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 25

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

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

Question 26

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

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

Question 27

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

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

Question 28

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

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

Question 29

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

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

Question 29 Explanation: 

In plants, this function is carried out by chloroplasts.

Question 30

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 , III and IV
C	I and III
D	I and II
E	II and IV
F	I , II and III

Question 31

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

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

Question 32

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	IV , VI , II , III , V and I
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	I , III , IV , V , II and VI

Question 33

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

Question 34

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

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

Question 35

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

Question 36

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

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

Question 37

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

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

Question 38

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

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

Question 38 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 39

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

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

Question 40

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 milk acted as the solute which breaks down the chemical compounds in the cocoa powder.
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 temperature of the mixture should have increased as the mixing progresses.

Question 41

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

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

Question 42

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

A	Benzene
B	Butane
C	Ethane
D	Methane

Question 43

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

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

Question 44

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

Question 45

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

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

Question 46

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

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

Question 47

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

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

Question 48

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

A	Cellulose
B	Fructose
C	Glucose
D	Maltose

Question 49

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

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

Question 50

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

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

Question 51

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

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

Question 52

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

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

Question 53

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

Question 54

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

Question 55

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

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

Question 55 Explanation: 

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

Question 56

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	They usually characterized by three double bonded C-O structures.
C	They often form ring structures.
D	Their molecular formulas are usually multiples of CH2O2.

Question 57

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

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

Question 57 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 58

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

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

Question 59

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

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

Question 60

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

A	polysaccharide
B	disaccharide
C	lipid
D	protein
E	monsaccharide

Question 61

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

A	3
B	4
C	2
D	5

Question 61 Explanation: 

They are mRNA, tRNA and rRNA.

Question 62

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

A	50
B	Millions
C	35
D	100
E	20

Question 63

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

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

Question 64

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

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

Question 64 Explanation: 

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

Question 65

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

Question 66

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

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

Question 67

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

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

Question 68

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	Carbohydrates
D	Nucleic Acids

Question 69

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

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

Question 70

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

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

Question 71

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

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

Question 72

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

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

Question 73

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

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

Question 74

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

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

Question 74 Explanation: 

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

Question 75

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

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

Question 76

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 are composed of action and involved in cell movement and maintaining cell structure.
C	They made the various fiberous proteins of α-helical coiled-coils that transport materials from one area to another.
D	They are composed of globular proteins that are assembled and disassembled in different regions of the cell to form hollow pathways.

Question 77

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

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

Question 78

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

Question 79

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

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

Question 80

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

A	Protein pumps
B	ATP injection
C	Heating
D	Hydrolysis

Question 81

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

A	3
B	2
C	6
D	5
E	4

Question 82

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

A	Glucose
B	Peptidoglycan
C	Flagella
D	Chitin

Question 83

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 84

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

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

Question 85

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

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

Question 86

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

Question 87

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

A	14
B	8
C	7
D	6

Question 88

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

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

Question 89

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

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

Question 90

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

A	4
B	6
C	2
D	3
E	5

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