Biochemistry - Exam 1 Practice
Questions and Answers 100% Pass
In a bacterial cell, the DNA is in the:
A) cell envelope.
B) cell membrane.
C) nucleoid.
D) nucleus.
E) ribosomes. ✔✔nucleoid
A major change occurring in the evolution of eukaryotes from prokaryotes was the development
of:
A) DNA.
B) photosynthetic capability.
C) plasma membranes.
D) ribosomes.
E) the nucleus ✔✔the nucleus
In eukaryotes, the nucleus is enclosed by a double membrane called the:
,A) cell membrane.
B) nuclear envelope.
C) nucleolus.
D) nucleoplasm.
E) nucleosome. ✔✔nuclear envelope
The dimensions of living cells are limited, on the lower end by the minimum number of
biomolecules necessary for function, and on the upper end by the rate of diffusion of solutes such
as oxygen. Except for highly elongated cells, they usually have lengths and diameters in the
range of:
A) 0.1 µm to 10 µm.
B) 0.3 µm to 30 µm.
C) 0.3 µm to 100 µm.
D) 1 µm to 100 µm.
E) 1 µm to 300 µm ✔✔0.3 µm to 100 µm
The bacterium E. coli requires simple organic molecules for growth and energy—it is therefore
a:
A) chemoautotroph.
, B) chemoheterotroph.
C) lithotroph.
D) photoautotroph.
E) photoheterotroph ✔✔chemoheterotroph
Which one of the following has the cellular components arranged in order of increasing size?
A) Amino acid < protein < mitochondrion < ribosome
B) Amino acid < protein < ribosome < mitochondrion
C) Amino acid < ribosome < protein < mitochondrion
D) Protein < amino acid < mitochondrion < ribosome
E) Protein < ribosome < mitochondrion < amino acid ✔✔Amino acid < protein < ribosome <
mitochondrion
The three-dimensional structure of macromolecules is formed and maintained primarily through
noncovalent interactions. Which one of the following is not considered a noncovalent
interaction?
A) carbon-carbon bonds
B) hydrogen bonds
C) hydrophobic interactions
Questions and Answers 100% Pass
In a bacterial cell, the DNA is in the:
A) cell envelope.
B) cell membrane.
C) nucleoid.
D) nucleus.
E) ribosomes. ✔✔nucleoid
A major change occurring in the evolution of eukaryotes from prokaryotes was the development
of:
A) DNA.
B) photosynthetic capability.
C) plasma membranes.
D) ribosomes.
E) the nucleus ✔✔the nucleus
In eukaryotes, the nucleus is enclosed by a double membrane called the:
,A) cell membrane.
B) nuclear envelope.
C) nucleolus.
D) nucleoplasm.
E) nucleosome. ✔✔nuclear envelope
The dimensions of living cells are limited, on the lower end by the minimum number of
biomolecules necessary for function, and on the upper end by the rate of diffusion of solutes such
as oxygen. Except for highly elongated cells, they usually have lengths and diameters in the
range of:
A) 0.1 µm to 10 µm.
B) 0.3 µm to 30 µm.
C) 0.3 µm to 100 µm.
D) 1 µm to 100 µm.
E) 1 µm to 300 µm ✔✔0.3 µm to 100 µm
The bacterium E. coli requires simple organic molecules for growth and energy—it is therefore
a:
A) chemoautotroph.
, B) chemoheterotroph.
C) lithotroph.
D) photoautotroph.
E) photoheterotroph ✔✔chemoheterotroph
Which one of the following has the cellular components arranged in order of increasing size?
A) Amino acid < protein < mitochondrion < ribosome
B) Amino acid < protein < ribosome < mitochondrion
C) Amino acid < ribosome < protein < mitochondrion
D) Protein < amino acid < mitochondrion < ribosome
E) Protein < ribosome < mitochondrion < amino acid ✔✔Amino acid < protein < ribosome <
mitochondrion
The three-dimensional structure of macromolecules is formed and maintained primarily through
noncovalent interactions. Which one of the following is not considered a noncovalent
interaction?
A) carbon-carbon bonds
B) hydrogen bonds
C) hydrophobic interactions
