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BIO 101 Exam 2

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Question 1

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Nucleic acids are polymers of 

Select one:

a. amino acids.

b. nucleotides.

c. glycerol.

d. monosaccharides.

e. fatty acids.

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Question 2

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Which molecules are the reactants or substrates for aerobic respiration?

Select one:

a. glucose and carbon dioxide

b. lactate and oxygen

c. carbon dioxide and water

d. oxygen and glucose

e. glucose and water

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Question 3

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Which of the following is NOT a correct statement about the second law of thermodynamics and entropy?

Select one:

a. The amount of disorder in the universe is always increasing.

b. To maintain organization of a cell, a continual input of energy is required.

c. Living cells without energy would become less organized.

d. While the total amount of energy in a system is unchanged, energy lost as heat is no longer useful to the cell in doing work.

e. Carbon dioxide and water form glucose without the input of energy.

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Question 4

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Which of the following is a byproduct of photosynthesis?

Select one:

a. carbon dioxide

b. water

c. oxygen

d. glucose

e. energy

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Question 5

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Which part of photosynthesis does not occur inside the thylakoid membrane?

Select one:

a. noncyclic electron pathway

b. cyclic electron pathway

c. electron transport chain

d. light reactions

e. Calvin cycle reactions

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Question 6

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How many membranes does a chloroplast have?

Select one:

a. one

b. two

c. three

d. four

e. five

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Question 7

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Which statement is not true about C3 and C4 plants? 

Select one:

a. C4
plants are more successful in hot climates than C3 plants.

b. C3
plants fix carbon dioxide in the mesophyll cells.

c. In C3
plants, O2 competes with CO2 for the active site of RuBP carboxylase.

d. C4
plants deliver CO2 to the Calvin cycle using bundle sheath cells sheltered from leaf air spaces.

e. CO2 is fixed at night to decrease water loss.

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Question 8

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The difference between 126C and 146C is 

Select one:

a. the number of electrons.

b. the number of protons.

c. the number of neutrons.

d. the number of carbon atoms.

e. the number of ionic bonds.

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Question 9

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We set up an experiment where the same species of plant is grown in boxes covered with plastic that only allows a single color of light. In which box would we expect the least plant growth and even perhaps the death of the plant to occur?

Select one:

a. white

b. blue

c. red

d. green

e. indigo

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Question 10

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Visible light has more energy than radio waves.

Select one:

True

False

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Question 11

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Water is a liquid at room temperature. This is due to 

Select one:

a. ionic bonding of the atoms in the water molecule.

b. covalent bonding in the water molecule.

c. covalent bonding between water molecules.

d. hydrogen bonding within the water molecule.

e. hydrogen bonding between water molecules.

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Question 12

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What type of bond will connect the amino acids in a protein? 

Select one:

a. peptide

b. triple covalent

c. polar covalent

d. ionic

e. double covalent

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Question 13

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The proposed cause of CJD and kuru in humans, mad cow disease, and scrapie in sheep is a change in a brain protein. Disease victims appear to have a protein that should normally contain alpha helices but instead they have changed into a protein made of beta pleated sheets. The disease appears to spread when the abnormal protein comes into contact with the normal protein, causing it to become deformed. Which level of protein structure is associated with these diseases? 

Select one:

a. primary

b. secondary

c. tertiary

d. quaternary

e. molecular

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Question 14

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In cellular respiration, what is the relationship between the energy content of the reactants (glucose and O2) and products (CO2 and H2O)? 

Select one:

a. The energy content of the reactants (glucose and O2) must equal the energy content of the products (CO2 and H2O).

b. The energy content of the reactants (glucose and O2) must be greater than the energy content of the products (CO2 and H2O).

c. The energy content of the reactants (glucose and O2) must be less than the energy content of the products (CO2 and H2O).

d. There is no relationship between the energy content of the reactants (glucose and O2) and the energy content of the products (CO2 and H2O).

e. There is no relationship between O2 and H2O, but the energy content of glucose is less than that of CO2.

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Question 15

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During an enzymatic reaction, what happens to the enzyme?

Select one:

a. It becomes the product.

b. It becomes the substrate.

c. It is used up.

d. The enzyme and the substrate form a permanent complex.

e. The enzyme and the substrate form a temporary complex.

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Question 16

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The ATP synthase complex is located in the

Select one:

a. cytoplasm outside the mitochondria.

b. matrix inside the mitochondria.

c. cristae of the mitochondria.

d. outer membrane of the mitochondria.

e. plasma membrane of the cell.

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Question 17

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What is a metabolic reaction called that involves one reaction releasing energy to provide energy for a second reaction that requires energy?

Select one:

a. an endergonic reaction.

b. an exergonic reaction.

c. a coupled reaction.

d. a reversible reaction.

e. anabolism.

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Question 18

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The final product of glycolysis is oxygen.

Select one:

True

False

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Question 19

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Which statement about photosynthesis and cellular respiration is not correct?

Select one:

a. Both will use the electron carrier NADH.

b. Both require ATP.

c. Both require a membrane.

d. Both require a cyclical enzymatic pathway.

e. Both require an electron transport chain.

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Question 20

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If an enzymatic reaction was controlled by feedback inhibition, we would expect it to stop

Select one:

a. only if the substrate was exhausted.

b. when the cofactors are exhausted.

c. when the product changed the pH.

d. as soon as a critical level of end product builds up.

e. only if a metabolic poison is added.

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Question 21

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Which of the following is not a property of water that results from hydrogen bonding? 

Select one:

a. The temperature of water changes very slowly.

b. Many polar substances dissolve in water.

c. Water molecules have cohesiveness.

d. Ice melts at -100°C.

e. Water has a high surface tension.

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Question 22

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Why does FADH2 result in fewer ATP than NADH + H+? 

Select one:

a. FADH2
only contains 1 electron.

b. FADH2
only contains 1 hydrogen ion.

c. FADH2
drops its electrons off lower on the electron transport chain.

d. FADH2
drops its electrons off higher on the electron transport chain.

e. FADH2
drops its electrons off to oxygen.

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If A has a free energy of 38 units, and C has a free energy of 45 units, and the reaction is exergonic, based on the calculation of free energy, which is the substrate and which is the product?

Select one:

a. A is the substrate and C is the product

b. C is the substrate and A is the product

c. it is impossible to tell with this information

d. both A and C are the products

e. both A and C are the substrates

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Question 24

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Hydrolysis of a fat results in the formation of 

Select one:

a. glycerol only.

b. fatty acids only.

c. glucose only.

d. two monosaccharides.

e. both glycerol and fatty acids.

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Question 25

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All of the ATP molecules formed by the complete oxidation of glucose result from the electron transfer chain.

Select one:

True

False

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