NURS251 Exam Questions And Accurate Answers 100% Pass
A point mutation that changes a codon specifying an amino acid into a stop codon is
known as a
frameshift mutation.
nonsense mutation.
missense mutation.
deletion mutation. - Answer 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 - Answer CAU, GUA
What is the relationship among genes, DNA, and proteins?
DNA in helical shape double strands are made of nitrogenous bases called proteins.
A segment of DNA that supplies information for making a specific protein is called a
gene.
Protein is comprised of DNA arranged into exact sequences called genes and are also
,known as amino acids.
DNA is a sequence of amino acids that contain instructions to make proteins. -DNA
contains a sequence of amino acids that spell out directions to synthesize a particular
protein.
What effect would occur from a "nonsense" point mutation?
No amino acid change and no effect on protein composition
Replacement of an amino acid codon with a "stop" codon, yielding a truncated protein
product
Complete destruction of the gene reading frame, no protein produced
Replacement of one amino acid with another in the final gene product - Answer
Replacement of an amino acid codon with a "stop" codon, yielding a truncated protein
product
What is ribosomes or ribosomal RNA role in the synthesis of proteins?
Provides a transport molecule that can transport a particular amino acid to the site of
protein synthesis-where the peptide chain is elongated-in the proper sequence
Provides the mechanism that coordinates the proper reading of the mRNA and
placement of the proper amino acid in the sequence provided by the tRNAs
Allows for interpretation of the two strands of DNA as to which is the "sense" strand and
,which is the "antisense" strand
Allows further processing of synthesized proteins post-translational modification so that
the final product is physiologically active Answer The coordinator mechanism that
allows proper reading of the mRNA and placement of the correct amino acid in the
sequence by the tRNAs
Which of the following is not required for DNA transcription?
Ribosome
Enzymes
Nucleotides
DNA - Answer Ribosome
Frameshift mutations
relates to the reading frame, or sequence of codons being altered.
can occur when one of more nucleotides is deleted from a DNA sequence.
can occur when one or more nucleotides are inserted into a DNA sequence.
can result in a completely new codon sequence that results in the production of
non-functional proteins.
all of the above - Answer all of the above
Which of the following is a stop codon?
UGU
CAG
UUA
AUG
, UAA - Answer UAA
Generally speaking, which of the following best describes the "Central Dogma" of
protein synthesis?
Correct
DNA --> transcription --> RNA --> translation --> protein.
DNA --> RNA --> translation --> transcription--> protein.
DNA --> translation --> RNA --> transcription--> protein.
DNA --> RNA --> transcription --> translation--> protein. - Answer DNA --> transcription
--> RNA --> translation --> protein.
Which of the following are components of nucleotides? Choose all that are correct
A. deoxyribose
B. amino acids
C. phosphate
D. enzymes
E. organic bases - Answer A. deoxyribose
C. phosphate
E. organic bases
DNA molecules are formed from?
A point mutation that changes a codon specifying an amino acid into a stop codon is
known as a
frameshift mutation.
nonsense mutation.
missense mutation.
deletion mutation. - Answer 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 - Answer CAU, GUA
What is the relationship among genes, DNA, and proteins?
DNA in helical shape double strands are made of nitrogenous bases called proteins.
A segment of DNA that supplies information for making a specific protein is called a
gene.
Protein is comprised of DNA arranged into exact sequences called genes and are also
,known as amino acids.
DNA is a sequence of amino acids that contain instructions to make proteins. -DNA
contains a sequence of amino acids that spell out directions to synthesize a particular
protein.
What effect would occur from a "nonsense" point mutation?
No amino acid change and no effect on protein composition
Replacement of an amino acid codon with a "stop" codon, yielding a truncated protein
product
Complete destruction of the gene reading frame, no protein produced
Replacement of one amino acid with another in the final gene product - Answer
Replacement of an amino acid codon with a "stop" codon, yielding a truncated protein
product
What is ribosomes or ribosomal RNA role in the synthesis of proteins?
Provides a transport molecule that can transport a particular amino acid to the site of
protein synthesis-where the peptide chain is elongated-in the proper sequence
Provides the mechanism that coordinates the proper reading of the mRNA and
placement of the proper amino acid in the sequence provided by the tRNAs
Allows for interpretation of the two strands of DNA as to which is the "sense" strand and
,which is the "antisense" strand
Allows further processing of synthesized proteins post-translational modification so that
the final product is physiologically active Answer The coordinator mechanism that
allows proper reading of the mRNA and placement of the correct amino acid in the
sequence by the tRNAs
Which of the following is not required for DNA transcription?
Ribosome
Enzymes
Nucleotides
DNA - Answer Ribosome
Frameshift mutations
relates to the reading frame, or sequence of codons being altered.
can occur when one of more nucleotides is deleted from a DNA sequence.
can occur when one or more nucleotides are inserted into a DNA sequence.
can result in a completely new codon sequence that results in the production of
non-functional proteins.
all of the above - Answer all of the above
Which of the following is a stop codon?
UGU
CAG
UUA
AUG
, UAA - Answer UAA
Generally speaking, which of the following best describes the "Central Dogma" of
protein synthesis?
Correct
DNA --> transcription --> RNA --> translation --> protein.
DNA --> RNA --> translation --> transcription--> protein.
DNA --> translation --> RNA --> transcription--> protein.
DNA --> RNA --> transcription --> translation--> protein. - Answer DNA --> transcription
--> RNA --> translation --> protein.
Which of the following are components of nucleotides? Choose all that are correct
A. deoxyribose
B. amino acids
C. phosphate
D. enzymes
E. organic bases - Answer A. deoxyribose
C. phosphate
E. organic bases
DNA molecules are formed from?
