Quiz 3

Question 1

1. Enzymes help chemical reactions proceed in cells because they lower
Select one:
 a. product energy
 b. exothermic energy
 c. starter energy
 d. activation energy  
 e. ATP synthase

Answer 1

d. activation energy

Question 2

2. Removal of the gallbladder may cause difficulty digesting
Select one:
 a. polysaccharides
 b. steroids
 c. lipids  
 d. starch
 e. proteins

Answer 2

c. lipids

Question 3

3. If you wanted to increase the rate of an enzyme catalyzed reaction, you could
   Select one:
   a. shake it vigorously
   b. add more product
   c. boil the reaction
   d. increase the concentration of enzyme
   e. add concentrated acid to the solution

Answer 3

d. increase the concentration of enzyme

Question 4

4. Minerals such as iron and magnesium are important parts of diet because they are often
   Select one:
   a. found in cell membranes
   b. broken down to generate energy in the body
   c. cofactors of enzymes
   d. easy to synthesize in cells
   e. found in the center of structural proteins

Answer 4

body

c. cofactors of enzymes

Question 5

5. Which association is incorrect?
Select one:
 a. protein and pepsin
 b. fats and urease  
 c. polypeptide and protease
 d. maltose and disaccharidase
 e. starch and amylase

Answer 5

b. fats and urease

Question 6

6. The function of the light reaction in photosynthesis is to
   Select one:
   a. fix CO2 with ribulose-1,5-bisphosphate
   b. speed up the Calvin-Benson cycle
   c. convert light energy into usable forms of chemical energy
   d. concentrate carbon dioxide
   e. synthesise carbohydrate

Answer 6

c. convert light energy into usable forms of chemical energy

Question 7

7. Why are plant leaves generally green?
   Select one:
   a. they reflect yellow and blue wavelengths of light
   b. carotenoid pigments are green
   c. they only absorb green light
   d. they do not absorb green light, so it is reflected
   e. they reflect nearly all light wavelengths

Answer 7

d. they do not absorb green light, so it is reflected

Question 8

8. Which of these organs of the digestive system participates least in the actual digestion of food?
Select one:
 a. stomach
 b. pancreas
 c. esophagus  
 d. small intestine
 e. mouth

Answer 8

c. esophagus

Question 9

9. Which types of human cells carry out the most fermentation?
Select one:
 a. stomach cells
 b. brain cells
 c. fat cells
 d. skeletal muscle cells
 e. epithelial cells

Answer 9

d. skeletal muscle cells

Question 10

10. Which of these substances could be absorbed directly without the need for digestion?
Select one:
 a. DNA
 b. cellulose
 c. fat
 d. glucose  
 e. protein

Answer 10

d. glucose

Question 11

11. Glycolysis
    Select one:
    a. synthesizes pyruvate from carbon dioxide
    b. takes place in mitochondria
    c. generates two ATP molecules per glucose
    d. oxidizes glucose to water and carbon dioxide
    e. is more efficient than aerobic respiration
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Answer 11

c. generates two ATP molecules per glucose

Question 12

12. The end products of photosynthesis are
Select one:
 a. chlorophyll and energy
 b. ATP and oxygen
 c. oxygen and carbohydrates  
 d. carbon dioxide and water
 e. oxygen and water

Answer 12

c. oxygen and carbohydrates

Question 13

13. The Krebs cycle occurs in the
Select one:
 a. cell cytoplasm
 b. thylakoids of the cristae
 c. electron transport chain
 d. intermembrane space
 e. mitochondrial matrix

Answer 13

e. mitochondrial matrix

Question 14

14. What structure stops food entering the trachea?
Select one:
 a. the soft palate
 b. border patrol
 c. the epiglottis  
 d. the esophageal sphincter
 e. the larynx

Answer 14

c. the epiglottis

Question 15

15. The end products of aerobic cellular respiration are
Select one:
 a. carbon dioxide and water  
 b. water and carbohydrates
 c. ATP and oxygen
 d. oxygen and water
 e. cytochromes and energy

Answer 15

a. carbon dioxide and water