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80 multiple choice questions

If no oxygen is available to a cell, then the net ATP production resulting from the metabolism of a single glucose molecule is:

two ATP molecules

If glucose is metabolized under completely anaerobic conditions, then pyruvate:

is converted by fermentation to CO2 and ethanol or to lactate

NADPH is synthesized during which of the following reactions?

the light reactions only

In human muscle cells, fermentation (by itself) produces:

lactate

Which sequence accurately describes the flow of electrons in photosynthesis?

H20 -> photosystem II -> photosystem I -> NADP

Where does the synthesis of pyruvate occur during glycolysis?

fluid portion of the cytoplasm

The end product of glycolysis is:

two pyruvate molecules

The products of glycolysis are:

ATP, NADH, and pyruvate

(Picture1) Based on the information provided in this future, what event contributes directly to the creation of a proton gradient across the thylakoid membrane?

The flow of electron through electron transport chain II

Where does the O2 released during photosynthesis come from?

H2O

At the end of glycolysis, the original carbons of the glucose molecule form:

two molecules of pyruvate

What is the final electron acceptor in cellular respiration?

oxygen

All of the following are true statements about ATP EXCEPT that it is:

synthesized only within mitochondria

Oxygen is necessary for cellular respiration because oxygen:

combines with carbon dioxide and water to form glucose.

Which of the following processes occurs in the cytoplasm?

glycolysis

Which of the following is NOT true of chlorophyll?

It is found in mitochondria

The reactant in an enzyme-catalyzed reaction is the:

substrate

All of the following compounds are necessary constituents (reactants) for photosynthesis EXCEPT:

oxygen

Albino corn has no chlorophyll. You would expect albino corn seedlings to:

fail to thrive because they cannot capture light energy

Most reactants in the body occur too slowly to sustain life. This is because:

many reactions require large inputs of activation energy

The main function of cellular respiration is to produce:

ATP

The energy of the movement of electrons down a concentration gradient via electron transport within chloroplasts and mitochondria is used to generate molecules of:

ATP

Which of these statements regarding enzymes is FALSE?

Enzymes provide energy for the reactions they catalyze

In the cells, ____ of the chemical energy in a metabolized glucose molecule is used for ATP production and the rest is released as heat.

40%

From the beginning of glycolysis to the end of the Krebs cycle, what has the cell gained from the breakdown of each molecule of glucose?

four molecules of ATP, 10 of NADH, and two of FADH2

Which of the following most closely matches the correct order of the main events of cellular respiration?

glycolysis, Krebs cycle, ETC, major ATP production

Which of the following processes occurs in a membrane?

the electron transport chain

Triclosan is a broad-spectrum antibacterial agent used in many household products. It is structurally similar to polychlorobiphenylol, a substrate that binds to the active site of the enzyme sulfotransferase. Based on these facts, you can conclude that triclosan most likely:

is a competitive inhibitor

Which statement BEST describes the relationship between an enzyme and a reactant?

The relationship is temporary.

Which of the following is a common to both fermentation and cellular respiration?

glycolysis

During which step of aerobic respiration is oxygen used?

electron transport system

In the absence of oxygen, suppose a single a single yeast cell undergoes fermentation and uses 100 molecules of glucose. How many molecules of ATP will be generated?

200

Which of the following statements is TRUE of glycolysis when followed by fermentation?

It produces a net gain of ATP

When a high-energy bond of ATP is broken, primarily what happens to the released energy?

It drives endergonic reaction in the cell

Which of the following statements is TRUE about the light reactions?

Photosystem II generates ATP, while photosystem I generates NADPH

The optimum reaction rate of a particular enzyme occurs at pH 7.3 at 37°C. This reaction would probably proceed faster by:

increasing the temperature to 38°C and keeping the pH at 7.3

Which of the following processes requires oxygen?

the electron transport chain

The energy of the movement of electrons down a concentration gradient via electron transport within the thylakoid membrane is used to generate:

ATP

The ATP and NADPH synthesized during the light reactions are:

dissolved in the stroma

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