Brock Biology of Microorganisms Chapter 4
Exam Questions With Correct Answers
The functional unit of genetic information is the
| | | | | | |
A) nucleotide.
|
B) gene.
|
C) chromosome.
|
D) protein. - CORRECT ANSWER✔✔-B) gene
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Which of the following statements is TRUE concerning mRNA?
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A) mRNA has a very short half-life.
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B) mRNA has complex secondary structure.
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C) mRNA is catalytic.
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D) mRNA is the product of translation. - CORRECT ANSWER✔✔-A)
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mRNA has a very short half-life.
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DNA-binding proteins interact predominantly within which portion of a
| | | | | | | | |
double-stranded DNA helix? | |
A) major groove
| |
B) minor groove
| |
C) 3' end
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,D) supercoil - CORRECT ANSWER✔✔-A) major groove
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AT-rich DNA will denature/melt
| | |
A) at a higher temperature than GC-rich DNA.
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B) at a lower temperature than GC-rich DNA.
| | | | | | |
C) usually at the same temperature as GC-rich DNA, with some minor
| | | | | | | | | | | |
variations.
D) in accordance with the animal or plant from which it was taken. -
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CORRECT ANSWER✔✔-B) at a lower temperature than GC-rich DNA
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Supercoiling is important for DNA structure, because | | | | | |
A) it holds together the antiparallel strands of DNA in the double helix.
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B) it provides energy for transcription.
| | | | |
C) it condenses the DNA so that it can fit inside the cell.
| | | | | | | | | | | |
D) it prevents RNA from pairing with DNA in the double helix. - CORRECT
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ANSWER✔✔-C) it condenses the DNA so that it can fit inside the cell
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Many pharmaceutical drugs specifically inhibit transcription in Bacteria
| | | | | | | |
but not Archaea or Eukarya. Why would drugs that inhibit transcription
| | | | | | | | | | |
only affect Bacteria and not Archaea even though they are both
| | | | | | | | | | |
prokaryotes?
A) Archaea and Eukarya have very similar ribosomes that are different
| | | | | | | | | | |
than bacterial ribosomes.
| |
, B) Bacteria lack a nucleus.
| | | |
C) Archaea lack operons.
| | |
D) Archaea and Eukarya have very similar RNA polymerases that are
| | | | | | | | | | |
different than bacterial RNA polymerases. - CORRECT ANSWER✔✔-D)
| | | | | | | |
Archaea and Eukarya have very similar RNA polymerases that are
| | | | | | | | | |
different than bacterial RNA polymerases.
| | | |
How are plasmids different than chromosomes?
| | | | |
A) Plasmids are always small, linear pieces of DNA.
| | | | | | | |
B) Plasmids are composed of single-stranded DNA.
| | | | | |
C) Plasmids contain genes that are NOT essential for cellular growth and
| | | | | | | | | | | |
replication.
D) Plasmids carry unimportant genes that are of little significance for
| | | | | | | | | | |
the ecology and metabolism of an organism. - CORRECT ANSWER✔✔-C)
| | | | | | | | |
Plasmids contain genes that are NOT essential for cellular growth and
| | | | | | | | | | | |
replication.
Genes that encoded for polymerases, gyrases, ribosomal proteins, and
| | | | | | | | |
other proteins essential to replication, transcription, and translation are
| | | | | | | | |
present on |
A) chromosomes.
|
B) plasmids.
|
C) chromosomes and plasmids.
| | |
Exam Questions With Correct Answers
The functional unit of genetic information is the
| | | | | | |
A) nucleotide.
|
B) gene.
|
C) chromosome.
|
D) protein. - CORRECT ANSWER✔✔-B) gene
| | | | |
Which of the following statements is TRUE concerning mRNA?
| | | | | | | |
A) mRNA has a very short half-life.
| | | | | |
B) mRNA has complex secondary structure.
| | | | |
C) mRNA is catalytic.
| | |
D) mRNA is the product of translation. - CORRECT ANSWER✔✔-A)
| | | | | | | | | |
mRNA has a very short half-life.
| | | | |
DNA-binding proteins interact predominantly within which portion of a
| | | | | | | | |
double-stranded DNA helix? | |
A) major groove
| |
B) minor groove
| |
C) 3' end
| |
,D) supercoil - CORRECT ANSWER✔✔-A) major groove
| | | | | |
AT-rich DNA will denature/melt
| | |
A) at a higher temperature than GC-rich DNA.
| | | | | | |
B) at a lower temperature than GC-rich DNA.
| | | | | | |
C) usually at the same temperature as GC-rich DNA, with some minor
| | | | | | | | | | | |
variations.
D) in accordance with the animal or plant from which it was taken. -
| | | | | | | | | | | | | |
CORRECT ANSWER✔✔-B) at a lower temperature than GC-rich DNA
| | | | | | | |
Supercoiling is important for DNA structure, because | | | | | |
A) it holds together the antiparallel strands of DNA in the double helix.
| | | | | | | | | | | |
B) it provides energy for transcription.
| | | | |
C) it condenses the DNA so that it can fit inside the cell.
| | | | | | | | | | | |
D) it prevents RNA from pairing with DNA in the double helix. - CORRECT
| | | | | | | | | | | | |
ANSWER✔✔-C) it condenses the DNA so that it can fit inside the cell
| | | | | | | | | | | | |
Many pharmaceutical drugs specifically inhibit transcription in Bacteria
| | | | | | | |
but not Archaea or Eukarya. Why would drugs that inhibit transcription
| | | | | | | | | | |
only affect Bacteria and not Archaea even though they are both
| | | | | | | | | | |
prokaryotes?
A) Archaea and Eukarya have very similar ribosomes that are different
| | | | | | | | | | |
than bacterial ribosomes.
| |
, B) Bacteria lack a nucleus.
| | | |
C) Archaea lack operons.
| | |
D) Archaea and Eukarya have very similar RNA polymerases that are
| | | | | | | | | | |
different than bacterial RNA polymerases. - CORRECT ANSWER✔✔-D)
| | | | | | | |
Archaea and Eukarya have very similar RNA polymerases that are
| | | | | | | | | |
different than bacterial RNA polymerases.
| | | |
How are plasmids different than chromosomes?
| | | | |
A) Plasmids are always small, linear pieces of DNA.
| | | | | | | |
B) Plasmids are composed of single-stranded DNA.
| | | | | |
C) Plasmids contain genes that are NOT essential for cellular growth and
| | | | | | | | | | | |
replication.
D) Plasmids carry unimportant genes that are of little significance for
| | | | | | | | | | |
the ecology and metabolism of an organism. - CORRECT ANSWER✔✔-C)
| | | | | | | | |
Plasmids contain genes that are NOT essential for cellular growth and
| | | | | | | | | | | |
replication.
Genes that encoded for polymerases, gyrases, ribosomal proteins, and
| | | | | | | | |
other proteins essential to replication, transcription, and translation are
| | | | | | | | |
present on |
A) chromosomes.
|
B) plasmids.
|
C) chromosomes and plasmids.
| | |
