Question 1

Which of the following statements is not true concerning the genetic code?

Accepted Answer

A)  It is an overlapping code.
B)  It is a "comma-less" code.
C)  It is an almost universal code.
D)  It is capable of wobble base pairing.
E)  It is a triplet code.F) C) and D)
G) D) and E)

Question 2

Amber mutations are mutations that create termination codons in the middle of an mRNA causing premature translation termination.

Accepted Answer

A) True 
 B)False

Question 3

Place the steps of translation elongation in the correct order.(1) Peptidyl transferase forms a peptide bond between the peptide in the P site and the newly arrived aminoacyl-tRNA in the A site.(2) EF-G,with GTP,translocates peptidyl-tRNA to the P site.(3) EF-Tu,with GTP,binds an aminoacyl-tRNA to the ribosomal A site.

Accepted Answer

A)  3,1,2
B)  3,2,1
C)  1,2,3
D)  1,3,2
E)  2,3,1F) B) and D)
G) D) and E)

Question 4

Both prokaryotes and eukaryotes rely on tmRNA to deal with aberrant termination.

Accepted Answer

A) True 
 B)False

Question 5

Peptidyl transferase activity can be inhibited in prokaryotic cells by penicillin.

Accepted Answer

A) True 
 B)False

Question 6

tmRNA is involved in rescuing the ribosome from non-stop translation.

Accepted Answer

A) True 
 B)False

Question 7

Ribosome recycling factor (RRF)is another RNA molecule that resembles tRNA.

Accepted Answer

A) True 
 B)False

Question 8

EF-Tu is an important protein in cells whose function is to

Accepted Answer

A)  properly fold proteins.
B)  ensure proper ribosome assembly.
C)  escort aminoacyl-tRNA to the ribosome.
D)  protect rRNA from degradation by RNases.
E)  stabilize mRNA within the ribosome.F) B) and E)
G) A) and B)

Question 9

Proteins are synthesized in the __________ to ____________ direction by the ribosome.

Accepted Answer

The answer of Proteins are synthesized in the __________ to...

Question 10

Which of the following characteristics is not a characteristic of a G protein?

Accepted Answer

A)  They bind GMP for activation.
B)  They have intrinsic GTPase activity.
C)  Binding of GTP activates their function.
D)  Cleavage of bound GTP to GDP inactivates them.
E)  They cycle between three conformational states.F) A) and C)
G) A) and E)

Question 11

tmRNA resembles tRNA except for the fact that it lacks a(n)_________ and a _____ loop.

Accepted Answer

The answer of tmRNA resembles tRNA except for the fact...

Question 12

The E site of the ribosome plays a critical role in the entrance of tRNA into the ribosome.

Accepted Answer

A) True 
 B)False

Exam 18: The Mechanism of Translation II: Elongation and Termination

Which of the following statements is not true concerning the genetic code?

Correct Answer
verified

The E site of the ribosome plays a critical role in the entrance of tRNA into the ribosome.

Correct Answer
verified

tmRNA is involved in rescuing the ribosome from non-stop translation.

Correct Answer
verified

Ribosome recycling factor (RRF)is another RNA molecule that resembles tRNA.

Correct Answer
verified

Amber mutations are mutations that create termination codons in the middle of an mRNA causing premature translation termination.

Correct Answer
verified

tmRNA resembles tRNA except for the fact that it lacks a(n)_____ and a _ loop.

Correct Answer
verified

Peptidyl transferase activity can be inhibited in prokaryotic cells by penicillin.

Correct Answer
verified

Correct Answer
verified

Which of the following characteristics is not a characteristic of a G protein?

Correct Answer
verified

EF-Tu is an important protein in cells whose function is to

Correct Answer
verified

Proteins are synthesized in the to __ direction by the ribosome.

Correct Answer
verified

Both prokaryotes and eukaryotes rely on tmRNA to deal with aberrant termination.

Correct Answer
verified

Exam 18: The Mechanism of Translation II: Elongation and Termination

Which of the following statements is not true concerning the genetic code?

Correct AnswerverifiedShow Answer

The E site of the ribosome plays a critical role in the entrance of tRNA into the ribosome.

Correct AnswerverifiedShow Answer

tmRNA is involved in rescuing the ribosome from non-stop translation.

Correct AnswerverifiedShow Answer

Ribosome recycling factor (RRF)is another RNA molecule that resembles tRNA.

Correct AnswerverifiedShow Answer

Amber mutations are mutations that create termination codons in the middle of an mRNA causing premature translation termination.

Correct AnswerverifiedShow Answer

tmRNA resembles tRNA except for the fact that it lacks a(n)_________ and a _____ loop.

Correct AnswerverifiedShow Answer

Peptidyl transferase activity can be inhibited in prokaryotic cells by penicillin.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following characteristics is not a characteristic of a G protein?

Correct AnswerverifiedShow Answer

EF-Tu is an important protein in cells whose function is to

Correct AnswerverifiedShow Answer

Proteins are synthesized in the __________ to ____________ direction by the ribosome.

Correct AnswerverifiedShow Answer

Both prokaryotes and eukaryotes rely on tmRNA to deal with aberrant termination.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

tmRNA resembles tRNA except for the fact that it lacks a(n)_____ and a _ loop.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Proteins are synthesized in the to __ direction by the ribosome.

Correct Answer
verified

Correct Answer
verified