NURS 251 EXAM QUESTIONS WITH VERIFIED ANSWERS
A point mutation that changes a codon specifying an amino acid into a stop
codon is called a
frameshift mutation.
nonsense mutation.
missense mutation.
deletion mutation.
nonsense mutation
The triplet code of CAT in DNA is represented as ______ in mRNA and ______ in
tRNA, respectively.
Correct!
CAU, GUA
CAU, GTA
CAT, CAT
CAT, GAA
CAU, GUA
What is the relationship among genes, DNA, and proteins?
Proteins are the nitrogenous bases that form double strands of DNA in its helical
shape.
A gene is a section of DNA that provides the directions for synthesizing a specific
protein.
Protein is composed of DNA that is organized into specific gene sequences
called amino acids.
DNA is composed of a series of amino acids that provide the directions for
synthesizing proteins.
, A gene is a section of DNA that provides the directions for synthesizing a specific
protein.
What is the expected result of a "nonsense" point mutation?
No change in amino acid sequence and no change in the composition of the
protein product
Replacing an amino acid codon with a "stop" codon, resulting in a truncated
protein product
Total disruption of the gene reading frame, no production of protein
Replacement of one amino acid with another in the final gene product
Replacing an amino acid codon with a "stop" codon, resulting in a truncated protein
product
What is the function of ribosomes (also known as ribosomal RNA) in protein
synthesis?
Serves as a transport molecule able to move a specific amino acid to the site of
protein synthesis (peptide chain elongation) in the correct sequence
Serves as the coordinator mechanism to allow proper reading of the mRNA and
placement of the correct amino acid in the sequence by the tRNAs
Allows interpretation of the two strands of DNA to determine which is the "sense"
strand and which is the "antisense" strand
Allows further processing of synthesized proteins (post-translational
modification in order to ensure that the final product is physiologically active)
Serves as the coordinator mechanism to allow proper reading of the mRNA and
placement of the correct amino acid in the sequence by the tRNAs
Which of the following is not needed for DNA transcription?
Ribosome
Enzymes
A point mutation that changes a codon specifying an amino acid into a stop
codon is called a
frameshift mutation.
nonsense mutation.
missense mutation.
deletion mutation.
nonsense mutation
The triplet code of CAT in DNA is represented as ______ in mRNA and ______ in
tRNA, respectively.
Correct!
CAU, GUA
CAU, GTA
CAT, CAT
CAT, GAA
CAU, GUA
What is the relationship among genes, DNA, and proteins?
Proteins are the nitrogenous bases that form double strands of DNA in its helical
shape.
A gene is a section of DNA that provides the directions for synthesizing a specific
protein.
Protein is composed of DNA that is organized into specific gene sequences
called amino acids.
DNA is composed of a series of amino acids that provide the directions for
synthesizing proteins.
, A gene is a section of DNA that provides the directions for synthesizing a specific
protein.
What is the expected result of a "nonsense" point mutation?
No change in amino acid sequence and no change in the composition of the
protein product
Replacing an amino acid codon with a "stop" codon, resulting in a truncated
protein product
Total disruption of the gene reading frame, no production of protein
Replacement of one amino acid with another in the final gene product
Replacing an amino acid codon with a "stop" codon, resulting in a truncated protein
product
What is the function of ribosomes (also known as ribosomal RNA) in protein
synthesis?
Serves as a transport molecule able to move a specific amino acid to the site of
protein synthesis (peptide chain elongation) in the correct sequence
Serves as the coordinator mechanism to allow proper reading of the mRNA and
placement of the correct amino acid in the sequence by the tRNAs
Allows interpretation of the two strands of DNA to determine which is the "sense"
strand and which is the "antisense" strand
Allows further processing of synthesized proteins (post-translational
modification in order to ensure that the final product is physiologically active)
Serves as the coordinator mechanism to allow proper reading of the mRNA and
placement of the correct amino acid in the sequence by the tRNAs
Which of the following is not needed for DNA transcription?
Ribosome
Enzymes
