BCH3025 Exam 1 UPDATED ACTUAL
Exam Questions and CORRECT Answers
In a bacterial cell, the DNA is in the:
A) cell envelope.
B) cell membrane.
C) nucleoid.
D) nucleus.
E) ribosomes. - CORRECT ANSWER - 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. - CORRECT ANSWER - E) 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 - 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. - CORRECT ANSWER - 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 - CORRECT ANSWER - B) Archaea
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 - 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 - CORRECT ANSWER - 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
E) van der Waals interactions - CORRECT ANSWER - 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 - CORRECT ANSWER - 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 - CORRECT ANSWER - B) Tetrahedral
What functional groups are present on this molecule?
A) Ether and aldehyde
B) Hydroxyl and aldehyde
C) Hydroxyl and carboxylic acid
D) Hydroxyl and ester
E) Hydroxyl and ketone - CORRECT ANSWER - B) Hydroxyl and aldehyde
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 - D) nucleic acids
Stereoisomers that are nonsuperimposable mirror images of each other are known as:
A) anomers.
B) cis-trans isomers.
Exam Questions and CORRECT Answers
In a bacterial cell, the DNA is in the:
A) cell envelope.
B) cell membrane.
C) nucleoid.
D) nucleus.
E) ribosomes. - CORRECT ANSWER - 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. - CORRECT ANSWER - E) 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 - 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. - CORRECT ANSWER - 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 - CORRECT ANSWER - B) Archaea
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 - 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 - CORRECT ANSWER - 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
E) van der Waals interactions - CORRECT ANSWER - 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 - CORRECT ANSWER - 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 - CORRECT ANSWER - B) Tetrahedral
What functional groups are present on this molecule?
A) Ether and aldehyde
B) Hydroxyl and aldehyde
C) Hydroxyl and carboxylic acid
D) Hydroxyl and ester
E) Hydroxyl and ketone - CORRECT ANSWER - B) Hydroxyl and aldehyde
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 - D) nucleic acids
Stereoisomers that are nonsuperimposable mirror images of each other are known as:
A) anomers.
B) cis-trans isomers.
