Question 1

In warm and dry conditions,when CO₂ levels fall and O₂ levels rise,photorespiration occurs as a result of plants closing their ________.

Accepted Answer

The answer of In warm and dry conditions,when CO₂ levels...

Question 2

The three stages of aerobic catabolism are

Accepted Answer

A)  photosynthesis, glycolysis, and oxidative phosphorylation. 
B)  glycolysis, the Krebs cycle, and oxidative phosphorylation. 
C)  glycolysis, fermentation, and the Krebs cycle. 
D)  photosynthesis, the Krebs cycle, and fermentation.

Question 3

If plants are able to capture energy from the sun,why do they need to pass that energy through the chemical reactions that are necessary to produce ATP?

Accepted Answer

A)  ATP enables the energy to be stored for later use or transferred to other chemical reactions. 
B)  Chloroplasts are unable to use the energy they capture from the sun. 
C)  Producing ATP enables the plant to destroy excess energy that was captured from the sun. 
D)  The mitochondria that capture the sun's energy are unable to use it for respiration.

Question 4

The molecular energy carrier that has less energy than other energy carriers but is more versatile because of its ability to be used in a larger variety of chemical reactions is ________.

Accepted Answer

The answer of The molecular energy carrier that has less...

Question 5

Which of the following molecules carries electrons that will be used to reduce other molecules in an electron transport chain?

Accepted Answer

A)  ATP 
B)  NADH 
C)  CO₂ 
D)  ADP

Question 6

What is the role of water in photosynthesis?

Accepted Answer

A)  It provides a phosphate group to ATP. 
B)  It captures light energy and transfers it to the electron transport chain. 
C)  It provides replacement electrons to the reaction center chlorophyll in photosystem II. 
D)  It combines with carbon dioxide (CO₂ ) to make glucose.

Question 7

Most people respond to a prolonged stay at high altitude by producing more hemoglobin,producing more and larger red blood cells,or both.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following statements describes the function of the electron transport chain (ETC)in photosynthesis?

Accepted Answer

A)  As electrons move through the ETC, they release energy that is used to concentrate protons in the thylakoid lumen. 
B)  As electrons move through the ETC, they catalyze the formation of ATP. 
C)  The ETC releases CO₂ from glucose. 
D)  The ETC captures and stores the electrons that are given off by NADPH.

Question 9

The process that converts NADH into NAD⁺ to keep glycolysis running under anaerobic conditions is called ________.

Accepted Answer

The answer of The process that converts NADH into NAD⁺...

Question 10

In C₄ plants,carbon fixation and the workings of rubisco are spatially separated.Carbon fixation occurs in the ________ cells,and then rubisco adds CO₂ to RuBP in ________ cells.

Accepted Answer

The answer of In C₄ plants,carbon fixation and the workings...

Question 11

You have shrunk to molecular size and find yourself in a mitochondrial chamber where protons are being pumped out of the chamber and across a membrane into another chamber.You are in the mitochondrion's ________.

Accepted Answer

The answer of You have shrunk to molecular size and...

Question 12

The number and arrangement of membranes inside a chloroplast are important to the chloroplast's functions.How would the absence of these membranes affect the manufacture of ATP in a chloroplast?

Accepted Answer

A)  The chloroplast would be unable to maintain the proton gradient required for ATP production. 
B)  The chloroplast would be unable to capture ATP directly from the sun. 
C)  The chloroplast would be unable to perform the Calvin cycle. 
D)  The chloroplast would be unable to perform anaerobic respiration.

Question 13

Most of the oxidation reactions that produce NADH in a cell take place in

Accepted Answer

A)  the Krebs cycle. 
B)  glycolysis. 
C)  photosynthesis. 
D)  the electron transport chain.

Question 14

During the process of photosynthesis,plants capture the kinetic energy of moving photons and transform it into potential energy in the form of

Accepted Answer

A)  pyruvate. 
B)  stroma. 
C)  chemical bonds. 
D)  thylakoid disks.

Question 15

Stomata admit CO₂ to the leaf interior but also facilitate the loss of water from the leaves; plants must regulate their stomata carefully or risk dehydration.A reasonable hypothesis associated with the global increase in atmospheric CO₂ is that plants will

Accepted Answer

A)  evolve lower stomatal densities to reduce the potential for desiccation. 
B)  grow smaller and more slowly than they do now. 
C)  keep their stomata closed most of the time to minimize carbon dioxide poisoning. 
D)  increase their stomatal densities to take advantage of the abundance of CO₂ .

Question 16

The most common cause of death by poisoning around the world is ________.

Accepted Answer

The answer of The most common cause of death by...

Question 17

NADH serves as an energy carrier in living organisms by coupling ________ with ________.

Accepted Answer

A)  oxygen production; the generation of carbon dioxide during cellular respiration 
B)  the synthesis of ATP; the synthesis of water 
C)  photosynthesis; metabolism 
D)  the catabolic aspects of cellular respiration; the synthesis of ATP

Question 18

The green pigment that is most commonly associated with photosynthesis is ________.

Accepted Answer

The answer of The green pigment that is most commonly...

Question 19

Biologists believe that Earth's early life-forms were exposed to an atmosphere that had no molecular oxygen and therefore had not yet evolved the Krebs cycle.If so,alcoholic fermentation would have been particularly critical to life,because without this pathway

Accepted Answer

A)  ethanol would not be available as a nutrient for other consumers. 
B)  lactic acid would accumulate and disable prokaryotic muscle cells. 
C)  carbon could not be recycled back into the biosphere for use by producers. 
D)  the only source of NADH for electron transport would be from glycolysis; therefore, ATP production would be greatly reduced.

Question 20

Several plant pigments have significant antioxidant qualities and can protect a cell from the damage inflicted on its biomolecules by free radicals.

Accepted Answer