BCH3025 Exam 1 | 301 Study Questions And Answers
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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.
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
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
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?
A) Ether and aldehyde
, B) Hydroxyl and aldehyde
C) Hydroxyl and carboxylic acid
D) Hydroxyl and ester
E) Hydroxyl and ketone ANS 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. ANS D) 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. ANS D) 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. ANS E) stereospecificity.
| Complete Solutions Rated A+
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.
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
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
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?
A) Ether and aldehyde
, B) Hydroxyl and aldehyde
C) Hydroxyl and carboxylic acid
D) Hydroxyl and ester
E) Hydroxyl and ketone ANS 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. ANS D) 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. ANS D) 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. ANS E) stereospecificity.
