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Brock Biology of Microorganisms Chapter 4 Exam Questions With Correct Answers
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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. - answerB) gene Which of the following statements is TRUE concerning mRNA? A) mRNA has a very short half-life. ...

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  • October 18, 2024
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  • 2024/2025
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©SIRJOEL EXAM SOLUTIONS
10/3/2024 9:54 PM


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. - 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. - 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 - 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.

, ©SIRJOEL EXAM SOLUTIONS
10/3/2024 9:54 PM

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. - 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. - 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. - 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. - 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.

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