BIOCHEM 423- UNIT 4 EXAM REVIEW
2026 ACTUAL QUESTIONS WITH
VERIFIED ANSWERS.
The genetic code is said to be degenerate because - correct
answer-more than one codon may code for a specific amino
acid.
One benefit of the degeneracy of the genetic code is that -
correct answer-it lessens the chance of deleterious mutations.
The translation process reads the mRNA in the _____ direction
and synthesizes the protein in the _____ direction. - correct
answer-5′-to-3′; amino-to-carboxyl
During attachment of an amino acid to its tRNA, how is ATP
required? - correct answer-The ATP forms an aminoacyl
adenylate that transfers the activated amino acid to the tRNA.
The codon AUG specifies either initiation of protein synthesis or
an internal methionine. What would be the sequence of the
,anticodon of a tRNA that binds to this codon? - correct answer-
5'-CAU-3'
Which statement is NOT true of tRNA? - correct answer-tRNA
contains a codon
Choose which characteristics are key features of the genetic
code. - correct answer-- The code is degenerate.
- The code has directionality.
- Three nucleotides encode an amino acid.
Select all the reaction steps required to form an
aminoacyl-tRNA. - correct answer-- formation of an aminoacyl
adenylate from an amino acid and ATP
- transfer of an aminoacyl group to a tRNA molecule
The role of the RNA-induced silencing complex (RISC) in RNA
interference is to - correct answer-disrupt gene expression by
cleaving mRNAs that are complementary to the guide strand of
the RNA duplex that was introduced.
, During ribosomal protein synthesis, the growing peptide chain
moves from the tRNA in the ____ site to the aminoacyl tRNA in
the ____ site - correct answer-P; A
Termination of protein synthesis occurs when a stop or
termination codon is in the A site. Termination occurs because -
correct answer-stop codons are recognized by specific proteins
that release the newly synthesized protein chain from the
ribosome.
How do microRNAs regulate gene transcription? - correct
answer-They bind to Argonaute proteins, forming complexes
that bind to mRNAs and cleave them.
Which statement is true of the tRNA-binding sites of the
ribosome? - correct answer-The A site is closer to the 3′ end of
the mRNA molecule being translated than the P site.
The____________binds the tRNA molecule that is attached to
the growing peptide chain. - correct answer-P site
2026 ACTUAL QUESTIONS WITH
VERIFIED ANSWERS.
The genetic code is said to be degenerate because - correct
answer-more than one codon may code for a specific amino
acid.
One benefit of the degeneracy of the genetic code is that -
correct answer-it lessens the chance of deleterious mutations.
The translation process reads the mRNA in the _____ direction
and synthesizes the protein in the _____ direction. - correct
answer-5′-to-3′; amino-to-carboxyl
During attachment of an amino acid to its tRNA, how is ATP
required? - correct answer-The ATP forms an aminoacyl
adenylate that transfers the activated amino acid to the tRNA.
The codon AUG specifies either initiation of protein synthesis or
an internal methionine. What would be the sequence of the
,anticodon of a tRNA that binds to this codon? - correct answer-
5'-CAU-3'
Which statement is NOT true of tRNA? - correct answer-tRNA
contains a codon
Choose which characteristics are key features of the genetic
code. - correct answer-- The code is degenerate.
- The code has directionality.
- Three nucleotides encode an amino acid.
Select all the reaction steps required to form an
aminoacyl-tRNA. - correct answer-- formation of an aminoacyl
adenylate from an amino acid and ATP
- transfer of an aminoacyl group to a tRNA molecule
The role of the RNA-induced silencing complex (RISC) in RNA
interference is to - correct answer-disrupt gene expression by
cleaving mRNAs that are complementary to the guide strand of
the RNA duplex that was introduced.
, During ribosomal protein synthesis, the growing peptide chain
moves from the tRNA in the ____ site to the aminoacyl tRNA in
the ____ site - correct answer-P; A
Termination of protein synthesis occurs when a stop or
termination codon is in the A site. Termination occurs because -
correct answer-stop codons are recognized by specific proteins
that release the newly synthesized protein chain from the
ribosome.
How do microRNAs regulate gene transcription? - correct
answer-They bind to Argonaute proteins, forming complexes
that bind to mRNAs and cleave them.
Which statement is true of the tRNA-binding sites of the
ribosome? - correct answer-The A site is closer to the 3′ end of
the mRNA molecule being translated than the P site.
The____________binds the tRNA molecule that is attached to
the growing peptide chain. - correct answer-P site
