BIO 148 EXAM 2 UKY QUESTIONS
AND ANSWERS
What do activators do? - Correct Answers -turn on transcription at the time & location
the mRNA needs to be made
Where do point mutations usually occur? - Correct Answers -the promoter (which
typically alters amount of gene expression)
What is created from mutations? - Correct Answers -alleles, which creates new proteins
& a new phenotype
Point mutation - Correct Answers -gene mutation in which a single base pair in DNA has
been changed
When do mutations occur? - Correct Answers -during DNA replication
Silent mutation - Correct Answers -A mutation that changes a single nucleotide, but
does NOT change the amino acid created
Missense mutation - Correct Answers -A base-pair substitution that results in a codon
that codes for a different amino acid
What determines the tertiary structure of proteins? - Correct Answers -genes determine
the amino acid sequence, which determine the tertiary structure
Two proteins w/ different amino acid sequence will have: - Correct Answers -different
primary and tertiary structures
Polypeptides is another name for: - Correct Answers -proteins
Nonsense mutation - Correct Answers -A mutation that changes an amino acid codon to
1 of the 3 stop codons, resulting in a shorter and usually nonfunctional protein "STOP
that nonsense!"
How many tRNA bonding sights do ribosomes have? - Correct Answers -3
tRNA - Correct Answers -an adapter molecule that holds acids in place, posses
anticodons that base pair w/ mRNA (antiparallel, complementary)
AND ANSWERS
What do activators do? - Correct Answers -turn on transcription at the time & location
the mRNA needs to be made
Where do point mutations usually occur? - Correct Answers -the promoter (which
typically alters amount of gene expression)
What is created from mutations? - Correct Answers -alleles, which creates new proteins
& a new phenotype
Point mutation - Correct Answers -gene mutation in which a single base pair in DNA has
been changed
When do mutations occur? - Correct Answers -during DNA replication
Silent mutation - Correct Answers -A mutation that changes a single nucleotide, but
does NOT change the amino acid created
Missense mutation - Correct Answers -A base-pair substitution that results in a codon
that codes for a different amino acid
What determines the tertiary structure of proteins? - Correct Answers -genes determine
the amino acid sequence, which determine the tertiary structure
Two proteins w/ different amino acid sequence will have: - Correct Answers -different
primary and tertiary structures
Polypeptides is another name for: - Correct Answers -proteins
Nonsense mutation - Correct Answers -A mutation that changes an amino acid codon to
1 of the 3 stop codons, resulting in a shorter and usually nonfunctional protein "STOP
that nonsense!"
How many tRNA bonding sights do ribosomes have? - Correct Answers -3
tRNA - Correct Answers -an adapter molecule that holds acids in place, posses
anticodons that base pair w/ mRNA (antiparallel, complementary)
