Section 4 Practice Test

Which of the following processes utilize the energy of the proton motive force to synthesize ATP? 1. Photophosphorylation; 2. substrate level phosphorylation; 3. oxidative phosphorylation; 4. catabolic phosphorylation; 5. fermentive phosphorylation

C) 1,3.

Which of the following molecules function as electron carriers that oxidize the energy source? 1. ADP; 2. ATP; 3. NAD+; 4. FAD; 5. NADP+

C) 3,4,5.

Which of the following statements about enzymes is FALSE? a. the part of the enzyme that binds with the substrate is called the active site. b. enzymes accelerate the conversion of one substance into another c. enzymes are lipids that function as biological catalysts d. enzyme interaction with substrate is very specific. more enzymes can bind with only a single substrate. e. without enzymes, energy-yielding reactions would still occur, but at a much slower rate.

C) Enzymes are lipids that function as biological catalysts.

The most common pathway that begins the breakdown of sugars is

C) glycolysis.

Humans and bacteria share the following metabolic feature(s): a. glycolysis b. fermentation c. TCA cycle d. electron transport chain E) All of these choices are correct.

E) All of these choices are correct.

Which of the following is a reason knowledge of microbial metabolism is useful to humans? a. many bacterial products commercially or medically important. b. bacteria can be useful in the production of foods such as yogurt and cheese c. waste products produced by bacteria can be useful in identification d. studying microbial metabolism metabolism has been useful in helping to understand similar pathways in eukaryotes. e. all of these choices are correct.

E) All of these choices are correct.

T or F If a starting compound has more free energy than the product and energy is released, this is an endergonic reaction.

False

T or F In prokaryotes, the electron transport chain is located in the inner mitochondrial membrane.

False

The use of energy to synthesize large molecules from smaller molecules is part of

anabolism.

The first set of reactions that occur during the catabolism of carbohydrates in cells is called?

glycolysis

Enzyme inhibition in which the inhibitor binds with the active site of the enzyme thereby preventing the binding of substrate to the active site is called

competitive inhibition.

Which microbial metabolism would be effective in taking up carbon dioxide pollution contributing to global climate change?

photosynthesis

Which of the following factors influence the level of enzyme activity? 1. substrate concentration; 2. temperature; 3. pH; 4. salt concentration; 5. presence of a cofactor

1,2,3,4,5.

Which of the following is TRUE with regard to ATP? 1. It is the energy currency of the cell; 2. It is composed of deoxyribose, adenine, and three phosphate groups; 3. The bond between the last two phosphate groups is a high-energy bond; 4. When ATP is hydrolyzed it produces ADP and P; 5. Cells can use ADP and P to reform ATP

1,2,3,4,5.

Which of the following substances are produced in the TCA cycle? 1. carbon dioxide; 2. NADH; 3. FADH 2; 4. ATP; 5. lactic acid

1,2,3,4.

Which of the following molecules are end products of fermentation? 1. lactic acid; 2. ethanol; 3. glucose 4. Carbon dioxide 5. propionic acid 6. Pyruvic acid

1,2,4,5.

Which of the following statements about enzymes is FALSE? a. the increase the rate of chemical reactions without being used up in the reactions b. They increase the rate of reactions by raising the activation energy for the reaction. c. the substance acted upon by an enzyme is called the substrate d. the substance produced after a chemical reaction is called the product e. without enzymes, chemical reactions in the body would occur too slowly or not at all.

b. They increase the rate of reactions by raising the activation energy for the reaction.

A metabolic process that consists of a sequential series of reactions is called a/an?

biochemical pathwawy

Which of the following statements about glycolysis is FALSE? a. it is a pathway that oxidizes glucose into pyruvic acid b. it is used in both anaerobic and aerobic respiration c. It generates approximately 36 ATP molecules per molecule of glucose. d. ATP is formed by substrate-level phosphorylation e. in addition to ADP, NADH is also formed

c. It generates approximately 36 ATP molecules per molecule of glucose.

Which of the following best describes the role of coenzymes such as NAD+ during metabolism? a. coenzymes are enzyme replacements b. coenzymes always bring energy to the reaction. c. coenzymes serve as electron and proton carriers during reactions d. coenzymes are a source of carbon during reactions e. none of these choices are correct

c. coenzymes serve as electron and proton carriers during reactions

Metabolic pathways in which large, energy rich molecules are broken down into smaller, lower energy products are called?

catabolism

Which of the following statements about enzymes is FALSE? a. enzymes increase the rate of chemical reactions without being used up in reactions b. enzymes increase the rate of reactions by lowering the activation energy for the reaction. c. the substance acted upon by an by an enzyme is called the substrate. d. the substance produced after a chemical reaction is called the product. e. enzymes are often used to slow metabolic processes.

e. enzymes are often used to slow metabolic processes

The process in which an inhibitor binds to a site other that the active site is called

noncompetitive inhibition.

T or F Allosteric enzymes have an allosteric site in addition to the active site. The binding of a regulatory molecule to the allosteric site causes the shape of the enzyme to change, altering the relative affinity of the enzyme for its substrate.

true