BIOL133 ACTUAL EXAM 2025
QUESTIONS AND VERIFIED ANSWERS|
100% CORRECT
______________ are parts of __________ molecules that do not contain information about a
protein's primary structure
a. intron; pre-mRNA
b. introns; mRNA
c. exons; pre-mRNA
d. exons; mRNA
A
The sequence of amino acids in a polypeptide is the proteins' primary structure.
The secondary structure of a protein is the regions of the molecule that are coiled or
folded (α helices or β pleated sheets) due to hydrogen bonds between amino acids. .
The tertiary structure of a protein is the overall shape of the protein due to
interactions between the side chains (R groups) of the amino acids. .
The quaternary structure of a protein refers to the joining together of 2 or more
polypeptide chains. .
nothing
All of the following are directly required for protein synthesis EXCEPT
_____________________.
a. DNA polymerase
b. tRNA
c. ribosomes
d. RNA polymerase
,A
Which of the following mutations would likely be most dangerous to a cell?
a. deletions of 3 nucleotides
b. deletion of 1 nucleotide
c. substitution of 1 nucleotide for another
B
Here is the amino acids sequence for a short piece of a protein:
Pro-Thr-Gln-Lys-Asn-Ser
Which of the following is the DNA TEMPLATE strand used to produce the mRNA that
encodes this protein sequence?
a. 5'AGAATTTTTTTGAGTAGG 3'
b. 5'GGATGAGTTTTTTTATCA 3'
c. 5'CCUACUCAAAAAAAUUCC 3'
d. 5'UUUUUAUCAUUGAGUAGG 3'
A
Which of the following DNA strands is the template strand for this molecule of mRNA?
5'AUUCGGCAUUCC 3'
a. 5'TAAGCCGTAAGG 3'
b. 5'GGAAUGCCGAAU 3'
c. 5'GGAATGCCGAAT 3'
d. 5'AUUCGGCAUUCC 3'
C
What type of mutation has occurred?
Original DNA: 3' AGCCGCATA 5'
Mutated DNA: 3' AGCCGCATC 5'
a. single amino acid replacement
b. shortened protein
, c. all amino acids in protein changed
d. no change (silent mutation)
B
Which characteristic of the genetic code lowers the likelihood of a mutation causing a
mutant phenotype?
a. universality
b. un-ambiguity
c. non-overlapping
d. redundancy
D
The CODING strand of a DNA molecule that encodes an mRNA molecule:
a. has the same nucleotide sequence as the template DNA strand.
b. has the complementary nucleotide sequence to the mRNA molecule (with Ts instead
of Us).
c. has the same nucleotide sequence as the template DNA strand except for the 3'/5' polarity.
d. has the same nucelotide sequence as the mRNA molecule (with Ts instead of Us).
D
The genetic code is said to be "redundant" because
_____________________________________.
a. one anticodon can attach to several amino acids
b. there is more than one start codon
c. one amino acid can have more than one codon
d. one codon can signify more than one amino acid
C
The genetic disease sickle cell anemia is due to a mutation in the �- globin gene
(a component of hemoglobin).
QUESTIONS AND VERIFIED ANSWERS|
100% CORRECT
______________ are parts of __________ molecules that do not contain information about a
protein's primary structure
a. intron; pre-mRNA
b. introns; mRNA
c. exons; pre-mRNA
d. exons; mRNA
A
The sequence of amino acids in a polypeptide is the proteins' primary structure.
The secondary structure of a protein is the regions of the molecule that are coiled or
folded (α helices or β pleated sheets) due to hydrogen bonds between amino acids. .
The tertiary structure of a protein is the overall shape of the protein due to
interactions between the side chains (R groups) of the amino acids. .
The quaternary structure of a protein refers to the joining together of 2 or more
polypeptide chains. .
nothing
All of the following are directly required for protein synthesis EXCEPT
_____________________.
a. DNA polymerase
b. tRNA
c. ribosomes
d. RNA polymerase
,A
Which of the following mutations would likely be most dangerous to a cell?
a. deletions of 3 nucleotides
b. deletion of 1 nucleotide
c. substitution of 1 nucleotide for another
B
Here is the amino acids sequence for a short piece of a protein:
Pro-Thr-Gln-Lys-Asn-Ser
Which of the following is the DNA TEMPLATE strand used to produce the mRNA that
encodes this protein sequence?
a. 5'AGAATTTTTTTGAGTAGG 3'
b. 5'GGATGAGTTTTTTTATCA 3'
c. 5'CCUACUCAAAAAAAUUCC 3'
d. 5'UUUUUAUCAUUGAGUAGG 3'
A
Which of the following DNA strands is the template strand for this molecule of mRNA?
5'AUUCGGCAUUCC 3'
a. 5'TAAGCCGTAAGG 3'
b. 5'GGAAUGCCGAAU 3'
c. 5'GGAATGCCGAAT 3'
d. 5'AUUCGGCAUUCC 3'
C
What type of mutation has occurred?
Original DNA: 3' AGCCGCATA 5'
Mutated DNA: 3' AGCCGCATC 5'
a. single amino acid replacement
b. shortened protein
, c. all amino acids in protein changed
d. no change (silent mutation)
B
Which characteristic of the genetic code lowers the likelihood of a mutation causing a
mutant phenotype?
a. universality
b. un-ambiguity
c. non-overlapping
d. redundancy
D
The CODING strand of a DNA molecule that encodes an mRNA molecule:
a. has the same nucleotide sequence as the template DNA strand.
b. has the complementary nucleotide sequence to the mRNA molecule (with Ts instead
of Us).
c. has the same nucleotide sequence as the template DNA strand except for the 3'/5' polarity.
d. has the same nucelotide sequence as the mRNA molecule (with Ts instead of Us).
D
The genetic code is said to be "redundant" because
_____________________________________.
a. one anticodon can attach to several amino acids
b. there is more than one start codon
c. one amino acid can have more than one codon
d. one codon can signify more than one amino acid
C
The genetic disease sickle cell anemia is due to a mutation in the �- globin gene
(a component of hemoglobin).
