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

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

Question 2

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

Question 3

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 4

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

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

Question 5

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

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

Question 6

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

A	Methane
B	Ethane
C	Butane
D	Benzene

Question 7

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

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

Question 8

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

Question 9

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

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

Question 10

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

Question 10 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 11

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

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

Question 12

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

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

Question 13

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

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

Question 13 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 14

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

Question 15

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

Question 16

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

A	20
B	50
C	Millions
D	35
E	100

Question 17

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

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

Question 18

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

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

Question 19

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

Question 19 Explanation: 

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

Question 20

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

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

Question 21

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 slow down chemical reaction by participating in the reaction.
D	They speed up chemical reactions by participating in the reaction.

Question 22

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

A	Temperature is a long term quantitative measurement of energy while heat is a short term measurement of energy.
B	Heat is the amount of energy associated with movement of atoms while temperature 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 the amount of energy associated with movement of atoms while heat is the intensity of heat (average speed of atoms).

Question 23

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

Question 24

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

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

Question 24 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 25

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

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

Question 25 Explanation: 

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

Question 26

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

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

Question 27

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

A	Cellulose
B	Glycogen
C	Carboxylic acids
D	Starch

Question 28

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	Light Microscope (LM)
C	Electron Microscope (EM)
D	Transmission Electron Microscope (TEM)

Question 29

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

A	Fructose
B	Glucose
C	Maltose
D	Cellulose

Question 30

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 31

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

A	They are composed of globular proteins that are assembled and disassembled in different regions of the cell to form hollow pathways.
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 only found in plant cells because animal cells with movement cannot maintain the structure.

Question 32

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

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

Question 33

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

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

Question 34

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	Cell theory
D	Theory of inheritance

Question 35

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

A	Flagella
B	Glucose
C	Chitin
D	Peptidoglycan

Question 36

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

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

Question 37

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

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

Question 38

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

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

Question 39

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

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

Question 40

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

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

Question 41

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

Question 42

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

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

Question 43

What is chemotaxis? (ID-B03-64)

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

Question 43 Explanation: 

This is how Bacteria sense food.

Question 44

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

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

Question 45

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

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

Question 45 Explanation: 

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

Question 46

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

Question 47

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

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

Question 48

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

Question 49

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

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

Question 50

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

A	Lipids
B	Nucleic Acids
C	Proteins
D	Carbohydrates

Question 51

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

A	4
B	2
C	5
D	6
E	3

Question 52

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

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

Question 53

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

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

Question 54

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

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

Question 55

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

A	Heating
B	ATP injection
C	Protein pumps
D	Hydrolysis

Question 56

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

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

Question 57

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

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

Question 58

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

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

Question 59

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

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

Question 59 Explanation: 

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

Question 60

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

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

Question 61

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

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

Question 62

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

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

Question 63

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

Question 64

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

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

Question 65

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

A	True
B	False

Question 65 Explanation: 

Water can dissolve ionic compounds and polar molecules.

Question 66

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

A	Lipids
B	Cellulose
C	Starch
D	Glycogen
E	Chitin

Question 67

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

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

Question 68

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

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

Question 68 Explanation: 

pH = -log₁₀[H⁺]
[H⁺] = 10^-pH

Question 69

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

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

Question 70

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

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

Question 71

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 changes in pH by accepting or donating hydrogen irons.
D	A substance that prevent genetic mutations.
E	A substance that resists genetic mutations.

Question 72

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

A	7
B	8
C	14
D	6

Question 73

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 74

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	Vital hormone producing reactions
C	Chemical precipitation reactions
D	Acid-base reactions

Question 75

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

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

Question 76

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

A	True
B	False

Question 77

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

A	3
B	2
C	4
D	5
E	6

Question 78

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

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

Question 78 Explanation: 

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

Question 79

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

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

Question 80

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

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

Question 80 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 81

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

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

Question 81 Explanation: 

In plants, this function is carried out by chloroplasts.

Question 82

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

Question 83

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

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

Question 83 Explanation: 

Note all prokaryotic cells have cell walls.

Question 84

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

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

Question 85

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

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

Question 86

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

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

Question 87

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

A	3
B	2
C	4
D	5

Question 87 Explanation: 

They are mRNA, tRNA and rRNA.

Question 88

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

A	lipid
B	disaccharide
C	protein
D	polysaccharide
E	monsaccharide

Question 89

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 90

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	10 electrons.
D	13 electrons.
E	5 electrons.

Question 90 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.

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