Lecture Quiz 4 (Ch. 7)

Question 1

Enzymes work by which of the following?
A. making exergonic reactions endergonic
B. making endergonic reactions exergonic
C. reducing activation energy
D. increasing activation energy

Answer 1

C. reducing activation energy

Question 2

In which form do plants generally store sugar molecules?
A. glycogen
B. chitin
C. cellulose
D. starch

Answer 2

D. starch

Question 3

molecules bearing both polar and nonpolar groups are said to be which of the following?
A. hydrophilic
B. amphipathic
C. hydrophobic
D. polyfunctional

Answer 3

B. amphipathic

Question 4

Monosaccharides may link together to form polysaccharides by forming which type of bond?
A. ionic
B. peptide
C. glycosidic
D. hydrogen

Answer 4

C. glycosdic

Question 5

Which of the following are organic molecules that help enzymes work correctly?
A. apoenzymes
B. holoenzymes
C. cofactors
D. coenzymes

Answer 5

D. coenzymes

Question 6

Which of the following bonds are not involved in tertiary structure?
A. hydrogen bonds
B. hydrophobic interactions
C. ionic bonds
D. peptide bonds

Answer 6

D. peptide bonds

Question 7

Which of the following groups varies among different amino acids?
A. carboxyl group
B. amino group
C. hydrogen atom
D. R group

Answer 7

D. R group

Question 8

Which of the following is an organism that obtains its energy from the transfer of electrons originating from chemical compounds and its carbon from an inorganic source?
A. chemoautotroph
B. chemoheterotroph
C. photoheterotroph
D. photoautotroph

Answer 8

A. chemoautotroph

Question 9

Which of the following molecules is reduced?
A. NAD+
B. O2
C. NADPH
D. FAD

Answer 9

C. NADPH

Question 10

Which of the following refers to the term metabolism?
A. all the reactions in a cell that break down molecules only
B. all the reactions in a cell that decompose molecules only
C. all the reactions in a cell that build new molecules only
D. all the reactions in a cell or organism

Answer 10

D. all the reactions in a cell or organism

Question 11

Which of these elements is not a micronutrient?
A. Ca
B. C
C. Cu
D. Co

Answer 11

B. C

Question 12

The sequence of amino acids in a protein is called its

Answer 12

primary structure

Question 13

processes in which cellular energy is used to make complex molecules from simpler ones are described as ___ reactions.

Answer 13

anabolic

Question 14

The loss of an electron from a molecule is called

Answer 14

oxidation

Question 15

The part of an enzyme to which a substrate binds is called the

Answer 15

active site