Which of the following best represents the central dogma of gene expression?
During transcription, DNA codes for polypeptides.
During transcription, DNA codes for mRNA, which codes for polypeptides during translation
During translation, DNA codes for mRNA, which codes for polypeptide during transcription
none of the above
A mutation prevents a gene from being transcribed into an mRNA. The mutation most likely disrupts
the promoter
the terminator
the start codon
the stop codon
both a and c
The functional product of a structural gene is
tRNA
mRNA
rRNA
a polypeptide
a, b, and c.
Which of the following is not a property of the genetic code?
It specifies the amino acids within a polypeptide
It is composed of codons, which are specific sequences of three bases.
It has a start codon, which specifies the starting point for polypeptide synthesis.
It has stop codons, which specify the end of polypeptide synthesis,
It determines the rate of transcription.
If a eukaryotic mRNA failed to have a cap attached to it 5' end, what would the negative consequence(s) be?
The mRNA would not properly exit the nucleus
The mRNA would not properly bind to a ribosome
The mRMA would not receive a Poly A tail.
The mRNA would not use the correct start codon.
Both a and b are correct
The small subunit of a ribosome is composed of
a protein
an rRNA molecule
many proteins
many rRNA molecules
many proteins and one rRNA molecule
The part of a tRNA that is complementary to a codon in an mRNA is the
acceptor stem
codon
peptidyl site
anticodon
adaptor loop
During the initiation of translation, the first codon, ________, enters the ___________ and associates with the initiator tRNA.
UAG, A site
AUG, A site
UAG, P site
AUG, P site
AUG, E site
The movement of the polypeptide from the tRNA in the P site to the tRNA in the A site is referred to as
peptide bonding
aminoacyl binding
translation
the peptidyl transfer reaction
elongation
During which stage of translation does the synthesis of a polypeptide occur?
initiation
termination
splicing
