Bio 212 Exam 2 review Questions and Answers
100% Solved
Which of the following methods is NOT used by eukaryotes to regulate gene expression?
specialized sigma proteins
Which of the following mutations would be most likely to have a harmful effect on an organism?
a single nucleotide insertion downstream of, and close to, the start of the coding sequence
Which statement is correct concerning DNA synthesis catalyzed by DNA polymerases?
The new DNA strand is synthesized in the 5'—>3' direction; the template strand is read in
the 3'—>5' direction.
A particular triplet of bases on the coding strand of DNA is 5'-CAG-3'. The anticodon on the
tRNA that binds the mRNA codon is _____. 3'-GUC-5'
There is a mutation in the repressor protein that results in a molecule known as a super-repressor
because it represses the lac operon permanently. Which of these would characterize such a
mutant? It cannot bind to the inducer.
, Bio 212 Exam 2 review Questions and Answers
100% Solved
You are studying the gene expression of an unknown cell. You are able to conclude that a
specific gene is under negative control by a repressor that binds close to the gene promotor and
later, you identify that the translated protein must be phosphorylated in order to be deactivated.
With this knowledge, which of the following is most likely to be true? The cell could be
either a bacterial cell or a eukaryotic cell
A mutation is known to affect the cell's ability to open the double helix during DNA replication.
Which of the following proteins is likely affected? Helicase
Consider the mutation on the section of a gene from a template strand of DNA shown below
(assume three complete codons are shown). What would this type of mutation be called and what
would be the effect on the phenotype?
Original DNA --> Mutated DNA
3' ...TACCGTAGA... 5' 3' ...TACCGTAGC... 5' Silent mutation, Ser added in each case
100% Solved
Which of the following methods is NOT used by eukaryotes to regulate gene expression?
specialized sigma proteins
Which of the following mutations would be most likely to have a harmful effect on an organism?
a single nucleotide insertion downstream of, and close to, the start of the coding sequence
Which statement is correct concerning DNA synthesis catalyzed by DNA polymerases?
The new DNA strand is synthesized in the 5'—>3' direction; the template strand is read in
the 3'—>5' direction.
A particular triplet of bases on the coding strand of DNA is 5'-CAG-3'. The anticodon on the
tRNA that binds the mRNA codon is _____. 3'-GUC-5'
There is a mutation in the repressor protein that results in a molecule known as a super-repressor
because it represses the lac operon permanently. Which of these would characterize such a
mutant? It cannot bind to the inducer.
, Bio 212 Exam 2 review Questions and Answers
100% Solved
You are studying the gene expression of an unknown cell. You are able to conclude that a
specific gene is under negative control by a repressor that binds close to the gene promotor and
later, you identify that the translated protein must be phosphorylated in order to be deactivated.
With this knowledge, which of the following is most likely to be true? The cell could be
either a bacterial cell or a eukaryotic cell
A mutation is known to affect the cell's ability to open the double helix during DNA replication.
Which of the following proteins is likely affected? Helicase
Consider the mutation on the section of a gene from a template strand of DNA shown below
(assume three complete codons are shown). What would this type of mutation be called and what
would be the effect on the phenotype?
Original DNA --> Mutated DNA
3' ...TACCGTAGA... 5' 3' ...TACCGTAGC... 5' Silent mutation, Ser added in each case
