Biochemistry - Exam 1 Practice
In a bacterial cell, the DNA is in the:
A) cell envelope.
B) cell membrane.
C) nucleoid.
D) nucleus.
E) ribosomes. - CORRECT ANSWER-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 - CORRECT ANSWER-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. - CORRECT ANSWER-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 - CORRECT ANSWER-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 - CORRECT ANSWER-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 - CORRECT
ANSWER-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
D) ionic interactions
E) van der Waals interactions - CORRECT ANSWER-carbon-carbon bonds
Which one of the following is not among the four most abundant elements in
living organisms?
A) Carbon
B) Hydrogen
C) Nitrogen
D) Oxygen
E) Phosphorus - CORRECT ANSWER-Phosphorus
The four covalent bonds in methane (CH4) are arranged around carbon to give
which one of the
following geometries?
A) linear
B) tetrahedral
C) trigonal bipyramidal
D) trigonal planar
E) trigonal pyramidal - CORRECT ANSWER-tetrahedral
The macromolecules that serve in the storage and transmission of genetic
information are:
A) carbohydrates.
B) lipids.
C) membranes.
D) nucleic acids.
E) proteins - CORRECT ANSWER-nucleic acids
Stereoisomers that are nonsuperimposable mirror images of each other are
known as:
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