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BCH3025 Exam 1 Questions with Detailed
Verified Answers
In a bacterial cell, the DNA is in the:
A) cell envelope.
B) cell membrane.
C) nucleoid.
D) nucleus.
E) ribosomes.
Ans: C) 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.
Ans: E) the nucleus
In eukaryotes, the nucleus is enclosed by a double membrane called the:
A) cell membrane.
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B) nuclear envelope.
C) nucleolus.
D) nucleoplasm.
E) nucleosome.
Ans: B) 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 m to 10 m.
B) 0.3 m to 30 m.
C) 0.3 m to 100 m.
D) 1 m to 100 m.
E) 1 m to 300 m.
Ans: C) 0.3 m to 100 m.
Which group of single-celled microorganisms has many members found growing in
extreme environments?
A) Bacteria
B) Archaea
C) Eukaryotes
D) Heterotrophs
E) None of the above
Ans: B) Archaea
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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.
Ans: B) 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
Ans: B) 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
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E) van der Waals interactions
Ans: A) 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
Ans: E) 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
Ans: B) Tetrahedral
What functional groups are present on this molecule?
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BCH3025 Exam 1 Questions with Detailed
Verified Answers
In a bacterial cell, the DNA is in the:
A) cell envelope.
B) cell membrane.
C) nucleoid.
D) nucleus.
E) ribosomes.
Ans: C) 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.
Ans: E) the nucleus
In eukaryotes, the nucleus is enclosed by a double membrane called the:
A) cell membrane.
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B) nuclear envelope.
C) nucleolus.
D) nucleoplasm.
E) nucleosome.
Ans: B) 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 m to 10 m.
B) 0.3 m to 30 m.
C) 0.3 m to 100 m.
D) 1 m to 100 m.
E) 1 m to 300 m.
Ans: C) 0.3 m to 100 m.
Which group of single-celled microorganisms has many members found growing in
extreme environments?
A) Bacteria
B) Archaea
C) Eukaryotes
D) Heterotrophs
E) None of the above
Ans: B) Archaea
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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.
Ans: B) 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
Ans: B) 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
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E) van der Waals interactions
Ans: A) 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
Ans: E) 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
Ans: B) Tetrahedral
What functional groups are present on this molecule?
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