bch 3025 exam 1 modules 1-5 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 - 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 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 - 0.3 micro meters to 100 micro meters
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 - chemo heterotroph.
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
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 - 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 - nucleic acids.
Stereoisomers that are nonsuperimposable mirror images of each other are known as
A) anomers.
B) cis-trans isomers.
C) diastereoisomers.
D) enantiomers.
E) geometric isomers - CORRECT ANSWER - enantiomers.
The enzyme fumarase catalyzes the reversible hydration of fumaric acid to l-malate, but it will
not catalyze the hydration of maleic acid, the cis isomer of fumaric acid. This is an example of:
A) biological activity.
B) chiral activity.
C) racemization.
D) stereoisomerization.
E) stereospecificity. - CORRECT ANSWER - stereo specificity.
Humans maintain a nearly constant level of hemoglobin by continually synthesizing and
degrading it. This is an example of a(n):
A) dynamic steady state.
B) equilibrium state.
C) exergonic change.
D) free-energy change.
E) waste of energy. - CORRECT ANSWER - dynamic steady state
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 - 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 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 - 0.3 micro meters to 100 micro meters
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 - chemo heterotroph.
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
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 - 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 - nucleic acids.
Stereoisomers that are nonsuperimposable mirror images of each other are known as
A) anomers.
B) cis-trans isomers.
C) diastereoisomers.
D) enantiomers.
E) geometric isomers - CORRECT ANSWER - enantiomers.
The enzyme fumarase catalyzes the reversible hydration of fumaric acid to l-malate, but it will
not catalyze the hydration of maleic acid, the cis isomer of fumaric acid. This is an example of:
A) biological activity.
B) chiral activity.
C) racemization.
D) stereoisomerization.
E) stereospecificity. - CORRECT ANSWER - stereo specificity.
Humans maintain a nearly constant level of hemoglobin by continually synthesizing and
degrading it. This is an example of a(n):
A) dynamic steady state.
B) equilibrium state.
C) exergonic change.
D) free-energy change.
E) waste of energy. - CORRECT ANSWER - dynamic steady state
