Microbio Chapter 13 Exam 2024/2025 with 100% correct answers
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Microbio Chapter 13 E
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Microbio Chapter 13 E
Proteins that recognize unfolded polypeptides and help them fold into their proper conformations are called ______________.
chaperones
Some microbial proteins are spliced after translation in a reaction that results in removal of one or more internal intervening sequences called exteins.
F...
Proteins that recognize unfolded polypeptides and help them fold into their proper conformations are
called ______________. correct answerschaperones
Some microbial proteins are spliced after translation in a reaction that results in removal of one or more
internal intervening sequences called exteins. correct answersFALSE
Signal recognition particles (SRPs) are associated with the Sec translocation system. correct answersTRUE
When a protein is synthesized, cis- or trans-splicing of that protein occurs A. following translation. B.
between transcription and translation. C. during transcription. D. prior to transcription. correct answersA
What might be a reason for the accumulation of improperly folded protein complexes in the bacterial
cell cytoplasm following translation? A. A problem exists with the functioning of molecular chaperones.
B. The cell is synthesizing proteins too rapidly. C. Polysomes are forming on the mRNA. D. The proteins
are being transcribed but not translated. correct answersA
The Tat and Sec pathways are protein translocation systems. correct answersTRUE
The Sec system is used by A. both Gram-positive and Gram-negative bacteria. B. neither Gram-positive
nor Gram-negative bacteria. C. Gram-positive bacteria only. D. Gram-negative bacteria only. correct
answersA
During ____ proteins are moved from the cytoplasm to the membrane or periplasmic space, while
during _____ proteins are moved from the cytoplasm to the external environment. correct
answerstranslocation; secretion
A bacterial cell that secretes proteins by types II and V systems is most likely Gram-negative. correct
answersTRUE
, Prior to secretion, Gram-negative bacterial proteins are translocated across one membrane while Gram-
positive proteins are translocated across two membranes. correct answersFALSE
Secretion systems that are found in both Gram-positive and Gram-negative bacteria correct answersType
1; Type IV
The process by which the base sequence of an RNA molecule is used to direct the synthesis of a protein
is called A. replication. B. transcription. C. reverse transcription. D. translation. correct answersD
During translation elongation, which event happens last? A. A tRNA carrying an amino acid binds to the A
site. B. A peptide bond forms. C. A tRNA molecule translocates from the A site to the P site. D. A tRNA
molecule translocates from the P site to the E site. correct answersD
Which is true regarding translation in bacteria? A. Translation begins with formation of the 30S initiation
complex. B. Translation ends when the Shine-Delgarno sequence is reached. C. The 70S ribosome is
composed of a 20S and 50S subunit. D. All of the choices are correct. correct answersA
DNA polymerase and aminoacyl-tRNA synthase are similar in that both have proofreading ability, but
differ in the substrates that they act upon. correct answersTRUE
This initiator tRNA of the bacterium Escherichia is a modified form of the initiator tRNA used by the yeast
Saccharomyces. correct answersTRUE
If you wished to design an antimicrobial agent that prevented the formation of the 70S initiation
complex in bacterial translation, which molecule should be specifically be targeted? A. IF-3 B. mRNA C.
Peptidyl transferase D. EF-1 correct answersA
Aminoacyl-tRNA synthetases catalyze covalent addition of __________ __________ to tRNAs. correct
answersamino acids
What is the minimum number of aminoacyl-tRNA synthetase enzymes needed to attach amino acids to
all the various tRNA molecules? A. 20 B. 61 C. 64 D. As many as there are different tRNAs. correct
answersA
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