Bio Chapter 8 quiz Flashcards


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1

The splitting of molecules into smaller components is referred to as:

catabolism.

2

Which of the following statements concerning anabolic reactions is FALSE?

they may split complex molecules into their components

3

Aerobic respiration, anaerobic respiration, and fermentation:

release free energy.

4

Cellular respiration is most accurately described as a(n) __________ process.

catabolic

5

Select the anaerobic pathway.

fermentation

6

The overall reaction for the aerobic respiration of glucose is summarized as:

C6H12O6 + 6 O2 + 6 H2O 6 CO2 + 12 H2O + Energy.

7

In aerobic respiration, glucose is completely

oxidized to carbon dioxide

8

Aerobic respiration is classified as:

a redox process

9

The transfer of electrons from glucose to oxygen during aerobic respiration takes place in a stepwise fashion through a number of intermediates rather than by direct transfer. This is because:

the energy of the electrons can be used to make ATP

10

In aerobic respiration, the electrons associated with the hydrogen atoms in glucose are ultimately transferred to:

oxygen in a series of steps.

11

Which of the following is not one of the four stages of the aerobic respiration of glucose?

hydrolysis

12

If conditions are aerobic, pyruvate flows directly into the __________ where some of its atoms are converted next to __________.

mitochondia; acetyl coenzyme A

13

Which of the following is an end product of glycolysis?

ATP

14

Which process does not match the location in a typical eukaryotic cell?

glycolysis-mitochondrion

15

In eukaryotes, glycolysis occurs in the:

cytosol

16

During chemiosmosis, __________ are transferred from NADH and FADH2to electron acceptor molecules, and the energy released is used to create a(n) __________ gradient across the inner mitochondrial membrane.

electrons; protons

17

Which of the following statements concerning decarboxylation reactions is FALSE?

they involve the removal of two protons and two electrons

18

In glycolysis, a six-carbon glucose molecule is converted to two three-carbon molecules of:

pyruvate

19

Glycolysis yields a net energy profit of __________ ATP molecules per molecule of glucose.

2

20

The chemical reaction illustrated in the figure is:

the first step in the citric acid cycle.

21

Considering only glycolysis and the conversion of pyruvate molecules to acetyl CoA molecules, how many NADH molecules will be produced from one glucose molecule?

four

22

One product of the initial (first) reaction of the citric acid cycle is:

citrate

23

During the citric acid cycle, each acetyl group entering the cycle yields:

1 ATP, 3 NADH, and 1 FADH2.

24

In the citric acid cycle, two acetyl CoA molecules are metabolized to:

4 CO2 + 6 NADH + 2 FADH2 + 2 ATP.

25

A glucose molecule that is metabolized via aerobic respiration has been completely broken down and released as CO2 by the end of:

the citric acid cycle.

26

In the electron transport chain, exergonic redox processes drive the endergonic reaction in which:

ATP is produced by phosphorylation of ADP

27

Coenzyme Q:

transfers electrons

28

The role of the oxygen molecules required for aerobic respiration is:

to accept the low energy electrons at the end of the electron transport chain.

29

During aerobic respiration, oxygen is:

reduced

30

A drowning death would be most directly due to:

The lack of oxygen to accept hydrogen.

31

Organismal body heat is a:

by product of exergonic reactions

32

Peter Mitchell demonstrated ATP production by aerobic bacteria by placing the bacteria in:

an acidic environment.

33

Which of the following statements about the electron transport chain is true?

the proton gradient established during electron transport is a form of potential energy

34

When hydrogen ions (protons) are pumped across the inner mitochondrial membrane, they form a proton gradient. ATP is then formed by a process known as:

chemiosmosis.

35

In chemiosmosis, ATP is produced as hydrogen ions (protons) pass through:

ATP synthase

36

Select the processes that are matched with the incorrect amount of ATP produced by that process per glucose molecule.

citric acid cycle-4 ATP

37

When one molecule of glucose is completely oxidized in aerobic respiration, the net amount of ATP produced is:

36 to 38.

38

In the skeletal muscle cells of vertebrates, as many as __________ molecules of ATP are produced from one molecule of glucose. This is less than might be expected, because electrons from NADH produced during glycolysis must be shuttled through the ____________ membrane at a cost.

36; mitochondrial

39

One important regulation point in the aerobic respiration of mammals occurs in glycolysis at the site of the enzyme phosphofructokinase, which is:

inhibited by high levels of ATP

40

Deamination of amino acids in mammals yields amino groups that are converted to __________, which is(are) excreted, and __________, which is(are) converted to one of the reactants of glycolysis or the citric acid cycle.

urea; carbon chains

41

One gram of __________ contains more than twice the amount of energy of a gram of glucose.

lipids

42

Which of the following molecules can provide energy through cellular respiration?

glucose, lipids and proteins

43

Saturated fatty acids store more energy than unsaturated fatty acids. Based on your knowledge of aerobic respiration, you draw this conclusion because saturated fatty acids:

are more highly reduced.

44

Anaerobic respiration differs from aerobic respiration in that anaerobic respiration:

can utilize NO3 - as the terminal electron acceptor.

45

The production of alcohol or lactate from pyruvate during __________ occurs as a means of regenerating __________ from __________.

fermentation, NAD, from NADH

46

During fermentation, the immediate fate of the electrons in NADH is that they:

are transferred to an organic molecule.

47

Select the molecule that contains the most stored chemical energy:

lactate.

48

Select the molecule that contains the least stored chemical energy:

oxygen

49

The ability of some bacteria to produce lactate is exploited by humans to make:

yogurt and sauerkraut.

50

Which of the following statements is not correct about lactic acid fermentation?

oxygen is the final electron acceptor of this pathway