Bi 112 Ch 15 Questions (2nd Batch)
A lack of amino acid availability would affect what stage in gene expression? -
ANS-Translation
\A mutation occurred in the third codon position of a gene, but the protein still functions
normally. How is this possible? - ANS-The genetic code is redundant, so that mutations in
the third position of the codon often result in the same amino acid being specified.
\A nucleotide deletion in DNA replication - ANS-causes the amino acids inserted after the
deletion to be incorrect.
\a. RNA is used as a template to make a complementary strand of DNA.
b. DNA is used as a template to make a complementary strand of DNA.
c. RNA is used as a template to make a complementary strand of RNA.
d. DNA is used as a template to make a complementary strand of RNA.
e. RNA is used as a template to make a polypeptide. - ANS-a. Reverse transcription
b. DNA replication
c. None
d. Transcription
e. Translation
\All codons code for amino acids. - ANS-False
\An addition or deletion that alters the codons downstream from the mutation. -
ANS-Frameshift Mutation
\An addition or deletion that alters the codons upstream from the mutation. - ANS-None of
these
\At what point in gene expression do molecules go from being information storage molecules
to metabolic and structurally functional molecules? - ANS-When RNA is translated into
protein
\AUG is a "start" codon or it can code for methionine. - ANS-True
\CCR5 is a cell surface receptor protein of white blood cells that attracts them to specific
tissue and organs to elicit an immune response. It is also the receptor to which R5 strains of
HIV bind to and enter T cells. Between 5-14% of people from Northern European descent
possess an allele known as CCR5-Δ32. In this allele, a 32 base pair section of the gene has
been deleted. What phenotype do people carrying the CCR5-Δ32 allele exhibit? -
ANS-People with CCR5-Δ32 will have impaired immune function, but they will exhibit
resistance to infection by HIV.
\Changes a codon for one amino acid into a codon for a different amino acid. -
ANS-Missense Mutation
\Changes a codon for one amino acid into a different codon for the same amino acid. -
ANS-Silent Mutation
\Changes a codon for one amino acid into a stop codon. - ANS-Nonsense Mutation
\Deleting a single base from an mRNA molecule usually alters one codon only. - ANS-False
\If a duplication occurs directly next to the original segment, it is termed a ________
duplication. - ANS-tandem
\If a frameshift mutation causes a stop codon to be inserted into the DNA sequence -
ANS-the resulting protein will be too short and non-functional.
A lack of amino acid availability would affect what stage in gene expression? -
ANS-Translation
\A mutation occurred in the third codon position of a gene, but the protein still functions
normally. How is this possible? - ANS-The genetic code is redundant, so that mutations in
the third position of the codon often result in the same amino acid being specified.
\A nucleotide deletion in DNA replication - ANS-causes the amino acids inserted after the
deletion to be incorrect.
\a. RNA is used as a template to make a complementary strand of DNA.
b. DNA is used as a template to make a complementary strand of DNA.
c. RNA is used as a template to make a complementary strand of RNA.
d. DNA is used as a template to make a complementary strand of RNA.
e. RNA is used as a template to make a polypeptide. - ANS-a. Reverse transcription
b. DNA replication
c. None
d. Transcription
e. Translation
\All codons code for amino acids. - ANS-False
\An addition or deletion that alters the codons downstream from the mutation. -
ANS-Frameshift Mutation
\An addition or deletion that alters the codons upstream from the mutation. - ANS-None of
these
\At what point in gene expression do molecules go from being information storage molecules
to metabolic and structurally functional molecules? - ANS-When RNA is translated into
protein
\AUG is a "start" codon or it can code for methionine. - ANS-True
\CCR5 is a cell surface receptor protein of white blood cells that attracts them to specific
tissue and organs to elicit an immune response. It is also the receptor to which R5 strains of
HIV bind to and enter T cells. Between 5-14% of people from Northern European descent
possess an allele known as CCR5-Δ32. In this allele, a 32 base pair section of the gene has
been deleted. What phenotype do people carrying the CCR5-Δ32 allele exhibit? -
ANS-People with CCR5-Δ32 will have impaired immune function, but they will exhibit
resistance to infection by HIV.
\Changes a codon for one amino acid into a codon for a different amino acid. -
ANS-Missense Mutation
\Changes a codon for one amino acid into a different codon for the same amino acid. -
ANS-Silent Mutation
\Changes a codon for one amino acid into a stop codon. - ANS-Nonsense Mutation
\Deleting a single base from an mRNA molecule usually alters one codon only. - ANS-False
\If a duplication occurs directly next to the original segment, it is termed a ________
duplication. - ANS-tandem
\If a frameshift mutation causes a stop codon to be inserted into the DNA sequence -
ANS-the resulting protein will be too short and non-functional.
