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Biology 101-09 Practice Questions - ProProfs Quiz

source : proprofs.com

Biology 101-09 Practice Questions – ProProfs Quiz

1. 

A major function of the mitochondrial inner membrane is the conversion of energy from electrons to the stored energy of the phosphate bond in ATP. To accomplish this function, this membrane must have all of the following features except

A.&nbsp

Proteins to accept electrons from NADH

B.&nbsp

The electron transport chain of proteins.

C.&nbsp

High permeability to protons

D.&nbsp

Proton pumps embedded in the membrane

E.&nbsp

Integral, transverse ATP synthase

2. 

In mitochondria, chemiosmosis translocates protons from the matrix into the intermembrane space, whereas in chloroplasts, chemiosmosis translocates protons from

A.&nbsp

The stroma into the thylakoid compartment

B.&nbsp

The light reactions to the Calvin cycle

C.&nbsp

The matrix to the stroma

D.&nbsp

The stroma to the chlorophyll

E.&nbsp

The intermembrane space to the matrix

3. 

The first law of thermodynamics states that energy can be neither created nor destroyed. For living organisms, which of the following is an important consequence of the first law?

A.&nbsp

The energy content of an organism is constant

B.&nbsp

Organisms are unable to transform energy

C.&nbsp

Life does not obey the first law of thermodynamics

D.&nbsp

The entropy of an organism decreases with time as the organism grows in complexity

E.&nbsp

The organism ultimately must obtain all of the necessary energy for life from its environment

4. 

Consider the following: Succinic acid dehydrogenase catalyzes the reaction of succinic acid to fumaric acid. The reaction is inhibited by malonic acid, which resembles succinic acid by cannot be catalyzed by succinic dehydrogenase. Increasing the ratio of succinic acid to malonic acid reduces the inhibitory effect of malonic acid. Which of the following is correct?

A.&nbsp

Succinic acid dehydrogenase is the enzyme, and fumaric acid is the substrate

B.&nbsp

Fumaric acid is the product and malonic acid is a non competitive inhibitor

C.&nbsp

Succinic acid dehydrogenase is the enzyme, and malonic acid is the substrate

D.&nbsp

Malonic acid is the product, and fumaric acid is a competitive inhibitor

E.&nbsp

Succinic acid is the substrate, and fumaric acid is the product

5. 

The next questions are based on the following information. A series of enzymes catalyze the reaction X→Y→Z→A. Product A binds to the enzyme that converts X to Y at a position remote from its active site. This binding decreases the activity of the enzyme.Substance A functions as

A.&nbsp

A coenzyme

B.&nbsp

An intermediate

C.&nbsp

A competitive inhibitor

D.&nbsp

The substrate

E.&nbsp

An allosteric inhibitor

6. 

Some photosynthetic organisms contain chloroplasts that lack photosystem II, yet are able to survive. The best way to detect the lack of photosystem II in these organisms would be

A.&nbsp

To test for CO2 fixation in the dark

B.&nbsp

To determine if they have thylakoids in the chloroplasts

C.&nbsp

To test for production of either sucrose or starch

D.&nbsp

To test for liberation of O2 in the light

E.&nbsp

To do experiments to generate an action spectrum

7. 

Use the following information to answer the question below. Thomas Engelmann illuminated a filament of algae with light that passed through a prism, thus exposing different segments to algae to different wavelengths of light. He added aerobic bacteria and then noted in which areas the bacteria congregated. He noted that the largest groups were found in the areas illuminated by the red and blue light.An outcome of this experiment was to help determine

A.&nbsp

The relationship between heterotrophic and autotrophic organisms

B.&nbsp

The relationship between wavelengths of light and the rate of aerobic respiration

C.&nbsp

The relationship between the concentration of carbon dioxide and the rate of photosynthesis

D.&nbsp

The relationship between wavelengths of light and the oxygen released during photosynthesis

E.&nbsp

The relationship between wavelengths of light and the amount of heat released

8. 

Correct statements regarding ATP includeI. ATP serves as a main energy shuttle inside cells.II. ATP drives endergonic reaction in the cell by the enzymatic transfer of the phosphate group to specific reactants.III. The regeneration of ATP from ADP and phosphate is an endergonic reaction

A.&nbsp

B.&nbsp

C.&nbsp

D.&nbsp

I and III only

E.&nbsp

I, II, and III

9. 

Because bundle-sheath cells are relatively protected from atmospheric oxygen, the level of __________ is held to a minimum in C4 plants.

A.&nbsp

Photosynthesis

B.&nbsp

Photorespiration

C.&nbsp

Glycolysis

D.&nbsp

Decarboxylation of malic acid

E.&nbsp

Oxidative phosphorylation

10. 

The question below is based on the stages of glucose oxidation listed below.A. stage I: glycolysisB. stage II: oxidation of pyruvate to acetyl CoAC. stage III: Krebs cycleD. stage IV: oxidative phosphorylation (chemiosmosis)Carbon dioxide is release during which stage(s)?

A.&nbsp

Stage III only

B.&nbsp

Stages III and IV

C.&nbsp

Stages I, II, and III

D.&nbsp

Stages II and III

E.&nbsp

Stages II, III, and IV

11. 

Carbon dioxide (CO2) is released during which of the following stages of cellular respiration?

A.&nbsp

Fermentation and glycolysis

B.&nbsp

Glycolysis and the oxidation of pyrubate to acetyl CoA

C.&nbsp

The citric acid cycle and oxidative phosphorylation

D.&nbsp

Oxidation of pyruvate to acetyl CoA and the citric acid cycle

E.&nbsp

Oxidative phosphorylation and fermentation

12. 

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

A.&nbsp

The electron vacancies in P680 are filled by electrons derived from water

B.&nbsp

The excitation is pased along to a molecule of P680 chlorophyll in the photosynthetic unit

C.&nbsp

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

D.&nbsp

Light energy excites electrons in an antenna pigment in a photosynthetic unit

E.&nbsp

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

13. 

CAM plants can keep stomates closed in daytime, thus reducing loss of water. They can do this because they

A.&nbsp

Use the enzyme phosphofructokinase, which outcompetes rubisco for CO2

B.&nbsp

Fix CO2 into organic acids during the night

C.&nbsp

Fix CO2 into sugars in the bundle-sheath cells

D.&nbsp

Use photosystems I and II at night

E.&nbsp

Fix CO2 into pyruvic acid in the mesophyll cells

14. 

A young relative of yours has never had much energy. He goes to a doctor for help and is sent to the hospital for some tests. There they discover his mitochondria can use only fatty acids and amino acids for respiration, and his cells produce more lactate than normal. Of the following, which is the best explanation of his condition>

A.&nbsp

His cells contain something that inhibits oxygen use in his mitochondria

B.&nbsp

His cells cannot move NADH from glycolysis into the mitochondria

C.&nbsp

His cells have a defective electron transport chain, so glucose goes to lactate instead of to acetyl CoA

D.&nbsp

His cells lack the enzyme in glycolysis that forms pyruvate

E.&nbsp

His mitochondria lack the transport protein that moves pyruvate across the outer mitochondrial membrane

15. 

The electron transport chain energy is used to pump H+ ions into which location?

A.&nbsp

B.&nbsp

Mitochondrial outer membrane

C.&nbsp

Mitochondrial inner membrane

D.&nbsp

Mitochondrial intermembrance space

E.&nbsp

Mitochondrial matrix

16. 

Chemical equilibrium is relatively rare in living cells. Which of the following could be an example of a reaction at chemical equilibrium in a cell?

A.&nbsp

A chemical reaction in which both the reactants and products are only used in a metabolic pathway that is completely inactive

B.&nbsp

An endergonic reaction in a active metabolic pathway where the energy for that reaction is supplied only by heat from the environment

C.&nbsp

A chemical reaction in which the entropy change in the reaction is just balanced by an opposite entropy change in the cell’s surroundings

D.&nbsp

A reaction in which the free energy at equilibrium is higher than the energy content at any point away from equilibrium

E.&nbsp

There is no possibility of having chemical equilibrium in any living cell

17. 

All of the following statements are true except:

A.&nbsp

Thylakoid membranes contain the photosynthetic pigments

B.&nbsp

The O2 released during photosynthesis comes from water

C.&nbsp

Glyceraldehyde phosphate is produced only in the light reactions of photosynthesis

D.&nbsp

When chlorophyll is reduced, it gains electrons

E.&nbsp

The light reactions of photosynthesis provide the energy for the Calvin cycle

18. 

Assume a thylakoid is somehow punctured so that the interior of the thylakoid is no longer separated from the stroma. This damage will have the most direct effect on which of the following processes?

A.&nbsp

The reduction of NADP+

B.&nbsp

The synthesis of ATP

C.&nbsp

The flow of electrons from photosystem II to photosystem I

D.&nbsp

The splitting of water

E.&nbsp

The absorption of light energy by chlorophyll

19. 

All of the following statements are representative of the second law of thermodynamics except

A.&nbsp

Systems tend to rearrange themselves toward greater entropy

B.&nbsp

Every time energy changes form, there is a decrease in entropy

C.&nbsp

Highly organized systems require energy for their maintenance

D.&nbsp

Energy transfers are always accompanied by some loss

E.&nbsp

Heat energy represents lost energy to most systems

20. 

All of the following statements are correct regarding the Calvin cycle of photosynthesis except:

A.&nbsp

One of the end products is glyceraldehyde phosphate

B.&nbsp

The 5-carbon sugar RuBP is constantly being regenerated

C.&nbsp

These reactions begin soon after sundown and end before sunrise

D.&nbsp

The energy source utilized is the ATP and NADPH obtained through the light reaction

21. 

A new flower species has a unique photosynthetic pigment. The leaves of this plant appear to be reddish yellow. What wavelengths of visible light are not being absorbed by this pigment?

A.&nbsp

Green and yellow

B.&nbsp

Blue, green, and red

C.&nbsp

Blue and violet

D.&nbsp

Red and yellow

E.&nbsp

Green, blue and violet

22. 

During aerobic respiration, electrons travel downhill in which sequence?

A.&nbsp

Food→NADH→electron transport chain→oxygen

B.&nbsp

Food→Krebs cycle→ATP→NAD+

C.&nbsp

Food→glycolysis→Krebs cycle→NADH→ATP

D.&nbsp

Glucose→ATP→oxygen

E.&nbsp

Glucose→ATP→electron transport chain→NADH

23. 

ATP is often an allosteric inhibitor of key enzymes in catabolic pathways. Which of the following statements in inconsistent with the role of ATP?

A.&nbsp

When ATP Levels are low in the cell, there is no inhibition of the catabolic pathway and ATP production is at a maximum

B.&nbsp

Increasing availability of ATP increases the energy available to drive endergonic reactions

C.&nbsp

When ATP levels are high in the cell, it is an indication that energy supply from catabolic reactions exceeds energy demand by anabolic reactions

D.&nbsp

The binding of ATP to allosteric sites on enzymes of the catabolic pathway decreases the production of ATP by the pathway.

E.&nbsp

ATP couples energy prodcution in catabolic pathways to energy demand in anabolic pathways.

24. 

Muscle cells in oxygen deprivation convert pyruvate to ________ and in this step gain

A.&nbsp

Lactate…ATP

B.&nbsp

Alcohol…ATP

C.&nbsp

Lactate…NAD+

D.&nbsp

Alcohol…CO2

E.&nbsp

ATP…NAD+

25. 

Which of the following is true regarding catabolic pathways?

A.&nbsp

They lead to the synthesis of catabolic compounds

B.&nbsp

They consume energy to build up polymers from monomers

C.&nbsp

They release energy as the degrade polymers to monomers

D.&nbsp

They do not depend on enzymes

E.&nbsp

Both A and B are correct

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