Photosynthesis

Question 1

C6H12O6 + 6 O2 —> 6 CO2 + 6H2O + energy
Which statement describes the results of this reaction?

Answer 1

C6H12O6 is oxidized and O2 is reduced

Question 2

The oxygen consumed during cellular respiration is involved directly in which process or event?

Answer 2

Accepting electrons at the end of the electron transport chain (becomes water)

Question 3

The free energy for the oxidation of glucose to CO2 and water is -686 kcal/mole and the free energy for the reduction of NAD+ to NADH is +53 kcal/mole. Why are only 2 molecules of NADH formed during glycolysis when it appears that as many as a dozen could be formed?

Answer 3

Most of the free energy available from the oxidation of glucose remains in pyruvate, one of the products of glycolysis

Question 4

How many carbon atoms are fed into the citric acid cycle as a result of the oxidation of 1 molecule of pyruvate?

Answer 4

2 carbon atoms

Question 5

In chemiosmotic phosphorylation, what is the most direct source of energy that is used to convert ADP + Pi to ATP?

Answer 5

Energy released from movement of protons through ATP synthase

Question 6

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

Answer 6

Oxidation of pyruvate to acetyl CoA and the citric acid cycle

Question 7

Which of the following produces the most ATP when glucose (C6H12O6) is completely oxidized to carbon dioxide and water?

Answer 7

Oxidative phosphorylation (chemiosmosis)

Question 8

Approximately how many molecules of ATP are produced from the complete oxidation of 1 molecule of glucose (C6H12O6) in cellular respiration?

Answer 8

38 or 36

Question 9

Which of the following most accurately describes what is happening along this chain? (Electron transport chain)

Answer 9

Each electron carrier alternates between being reduced and being oxidized

Question 10

In the absence of oxygen, yeast cells can obtain energy by fermentation, resulting in the production of:

Answer 10

ATP, CO2, and ethanol (ethyl alcohol)

Question 11

When oxygen is released as a result of photosynthesis, it is a by-product of which of the following?

Answer 11

Splitting the water molecules

Question 12

What did Engelmann conclude about the congregation of bacteria in the red and blue areas?

Answer 12

Bacteria congregated in these areas because these areas had the most oxygen being released

Question 13

An outcome of this experiment was to help determine:

Answer 13

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

Question 14

Figure 10.1 shows the absorption spectrum for chlorophyll a and the action spectrum for photosynthesis. Why are they different?

Answer 14

Other pigments (antenna pigments) absorb light in addition to chlorophyll a

Question 15

Which statement describes the functioning of photosystem II?

Answer 15

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

Question 16

Which of the following statements best represents the relationships between the light reactions and the calvin cycle?

Answer 16

The light reactions provide ATP and NADPH to the calvin cycle
Cycle returns ADP, Pi, and NADP+ to the light reactions

Question 17

What is the primary function of the calvin cycle?

Answer 17

Synthesize simple sugars from carbon dioxide

Question 18

The pH of the inner thylakoid space has been measured, as have the pH of the stroma and of the cytosol of a particular plant cell. Which relationship would you expect to find?

Answer 18

The pH within the thylakoid is less than that of the stroma

Question 19

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

Answer 19

Fix CO2 into organic acids during the night

Question 20

Endergonic =

Answer 20

Anabolic

Question 21

Exergonic =

Answer 21

Catabolic

Question 22

Define hydrolysis

Answer 22

Adding water to break bond and extract energy

Question 23

Exergonic is _______ energy

Answer 23

Extracting

Question 24

Endergonic _______ and ______ energy

Answer 24

Requires and absorbs

Question 25

Catabolic processes are almost always…

Answer 25

Hydrolysis reactions

Question 26

Anabolic process are almost always…

Answer 26

Dehydration syntheses

Question 27

The ______ the concentration of enzyme, the ______ the rate of reaction

Answer 27

Higher/higher, lower/lower