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bch 3025 exam 1 modules 1-5 Exam with complete solutions 2024_2025.
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bch 3025 exam 1 modules 1-5 Exam withcomplete solutions 2024/2025
In a bacterial cell, the DNA is in the:
A) cell envelope.
B) cell membrane.
C) nucleoid.
D) nucleus.
E) ribosomes. - 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. - 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 - 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. - 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. - 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 - 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 - 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 - 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 - 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 - 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. - 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 - 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. - 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. - ANSWER✓✓-dynamic steady state
If heat energy is absorbed by the system during a chemical reaction, the reaction
is said to be
A) at equilibrium.
B) endergonic.
C) endothermic.
D) exergonic.
E) exothermic. - ANSWER✓✓-Endothermic
If the free energy change delta G for a reaction is -46.11 kJ/mol, the reaction is:
A) at equilibrium.
B) endergonic.
C) endothermic.
D) exergonic.
E) exothermic. - ANSWER✓✓-Exergonic.
The major carrier of chemical energy in all cells is
A) acetyl triphosphate.
B) adenosine monophosphate.
C) adenosine triphosphate.
D) cytosine tetraphosphate.
E) uridine diphosphate - ANSWER✓✓-adenosine triphosphate
Enzymes are biological catalysts that enhance the rate of a reaction by:
A) decreasing the activation energy.
B) decreasing the amount of free energy released.
C) increasing the activation energy.
D) increasing the amount of free energy released.
E) increasing the energy of the transition state. - ANSWER✓✓-
decreasing the activation energy.
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