West Los Angeles College » Biology » Biology 006 - Genera Biology I » Spring 2021

Biology 006 - Genera Biology I » Spring 2021 » Exam 3

Need help with your exam preparation?

Existing Quiz Clients Login here

Question #1

In a catabolic reaction, electrons from food are…

A. added by reduction and stored in ATP.

B. added by reduction and stored in NADH.

C. added by oxidation and stored in ATP.

D. removed by reduction and stored in NADH.

E. removed by oxidation and stored in NADH.

Question #2

Once ATP donates its phosphate to a substrate it becomes ADP. This ADP can be converted back to ATP in a(an) ____________________________________reaction.

A. endergonic

B. denaturation

C. fermentation

D. oxidative phosphorylation

Question #3

Which occurs only in anaerobic metabolism of glucose?

A. glycolysis

B. citric acid cycle

C. lactate fermentation

D. oxidative phosphorylation

E. acetyl CoA formation

Question #4

CAM (crassulacean acid metabolism) plants such as cacti and succulents differ from standard C4 plants such as corn in which of the following ways?

A. CAM plants use both mesophyll and bundle sheath leaf cells for photosynthesis whereas C4 plants do not.

B. CAM plants are limited to producing CO2 for the Calvin cycle during the day, while C4 plants produce CO2 for the Calvin cycle both during the day and at night.

C. CAM plants minimize photorespiration whereas C4 plants do not.

D. CAM plants produce a 4-carbon molecule in the first step of carbon fixation, but C4 plants do not.

E. CAM plants are more efficient at producing sugar than C4 plants regardless of environmental conditions.

Question #5

In eukaryotes, most proteins contain short stretches of amino acid sequences called sorting signals which direct the protein to the correct cellular location.

A. TRUE

B. FALSE

Question #6

The charge on the amino acids found the active site of an enzyme would be affected by ________.

A. antibiotics

B. temperature

C. pH

D. substrate concentration

E. salt concentration

Question #7

Two glucose molecules undergo cellular respiration. Match the end-products of the citric acid cycle with their correct numbers that would result from the breakdown of these two glucose molecules by cellular respiration. ATP

A. 2

B. 8

C. 4

D. 12

Question #8

A. 4

B. 12

C. 16

D. 8

Question #9

A. 8

B. 4

C. 2

D. 12

Question #10

A. 4

B. 8

C. 2

D. 12

Question #11

A fabric company wants to create a new material for the army based on cell research. This fabric will be able to bear high levels of tension efficiently. What cellular structure could the army mimic to create this kind of fabric?

A. Centrioles.

B. Microtubules.

C. pili

D. Intermediate filaments.

E. Thick filaments.

Question #12

The amount of available energy that can be used to do work is called

A. kinetic energy.

B. entropy.

C. free energy.

D. heat.

E. enthalpy.

Question #13

For a reaction to be spontaneous it must show a net decrease in both free energy and entropy.

A. FALSE

B. TRUE

Question #14

Your liver produces 90% of the cholesterol found in your body. When cholesterol levels get too high, the first enzyme in the pathway of cholesterol synthesis is inhibited. This is an example of:

A. Feedback inhibition

B. A coenzyme

C. Denaturation

D. Positive feedback

E. Equilibrium

Question #15

The Endosymbiosis theory best describes the origins of peroxisomes in eukaryotes.

A. FALSE

B. TRUE

Question #16

Which statement regarding events in the functioning of photosystem II is false?

A. The splitting of water yields molecular oxygen as a by-product.

B. Light energy excites electrons in accessory pigments found in the harvesting complex

C. The missing electrons of P680 are filled by electrons derived from water.

D. The energy of sunlight is passed along to P680 chlorophyll.

E. The P680 chlorophyll donates a pair of protons to NADPH, which is then converted to NADP+.

Question #17

Which of the following are produced during the citric acid cycle resulting from the breakdown of one glucose molecule?

A. 2 CO2 and Oxygen.

B. 1 FADH2 and Oxygen.

C. 3 NADH

D. 6 NADH

E. 2 FADH2

F. 2 FADH2, 6 NADH, 4 CO2, and 2 ATP

Question #18

Which of the following statements is/are true about protein translocation

A. proteins must be completely synthesized before entering the ER lumen

B. proteins must by glycosylated before entering the ER

C. proteins must be appropriately targeted to the ER by an amino-terminal signal sequence

D. proteins must bind to a translocon pore in the ER membrane

E. an SRP is required, proteins must be appropriately targeted to the ER by an amino-terminal signal sequence, and proteins must bind to a translocon pore in the ER membrane

F. an SRP is required

Question #19

Altering the three-dimensional structure of an enzyme might

A. prevent the enzyme from adding energy to a reaction.

B. prevent the substrate from binding the enzyme's active site.

C. change the amount of energy needed for a reaction.

D. change the type of substrate that binds the enzyme's active site.

E. change the type of product produced in the reaction.

Question #20

In the citric acid cycle, succinate is oxidized to form ________

A. succinate dehydrogen ase

B. FADH2

C. fumarate

Question #21

This step is catalyzed by _______

A. fumarate

B. succinate dehydrogen ase

C. FADH2

Question #22

The electron carrier __________ is produced

A. fumarate

B. succinate dehydrogen ase

C. FADH2

Question #23

Which of the following processes will NOT occur in the absence of oxygen?

A. glycolysis and pyruvate oxidation

B. pyruvate oxidation

C. citric acid cycle, electron transport chain, oxidative phosphorylation, and pyruvate oxidation

D. oxidative phosphorylation and pyruvate oxidation

E. electron transport chain

F. citric acid cycle

Question #24

What would you predict about this reaction: Pi + ADP --> ATP ?

A. It has a change in free energy that is greater than 0, and hence can be used to drive endergonic reactions.

B. It can be used to drive endergonic reactions.

C. It yields energy.

D. It has a change in free energy that is less than 0.

E. It has a change in free energy that is greater than 0.

Question #25

When scientists placed ATP Synthase linked to a fluorescent actin protein on a microscope slide and then added ATP to the synthase, the actin could be seen spinning counterclockwise. If this experiment could be replicated in a cell going through oxidative phosphorylation what would happen?

A. The actin would spin clockwise because ATP would be hydrolyzed.

B. The actin would spin counterclockwise because ATP would be produced instead of hydrolyzed.

C. The actin would spin counterclockwise because ATP would be hydrolyzed.

D. The actin would spin clockwise because ATP would be produced instead of hydrolyzed.

Question #26

From your understanding of the Calvin cycle, which of the following statements would be correct when 6 CO2 molecules are introduced into this cycle?

A. 1 RuBP would be used

B. 18 ATP would be required and 3 ATP would be produced

C. 3 ATP would be produced

D. 3 NAPDH would be required

E. two G3P molecules would be removed from the cycle

F. 18 ATP would be required and two G3P molecules would be removed from the cycle

Need help with your exam preparation?

Existing Quiz Clients Login here