Biology 107 Final Exam Questions and
Answer
If DNA from an organism is analyzed it is found that the thymidine nucleobases
makes up 20% of the total. What % of the nucleobases are adenine? - ANSWER-
20%
It became apparent to Watson and Crick after completion of their model that the
DNA molecule could carry a vast amount of hereditary information in which of the
following? - ANSWER-Sequence of Bases
Which of the following descriptions best fits the class of molecules known as
nucleotides? - ANSWER-A nitrogenous base, a phosphate group, and a sugar.
Which of the following statements is consistent with the Watson and Crick model of
DNA? - ANSWER-The pyrimidine and purine in each base pair come from opposite
strands.
If radioactive thymidine is added to cells, what macromolecules will be labeled? -
ANSWER-DNA
What component of amino acid structure varies among different amino acids? -
ANSWER-The components of the R-group.
The chemical linkage between two amino acids is known as a... - ANSWER-Peptide
bond.
Which level of protein structure do the alpha-helix and beta-pleated sheet
represent? - ANSWER-Secondary
When amino acids polymerize to form a protein: - ANSWER-A covalent bond forms
between the amino group of one amino acid and the carboxylic acid of a second.
Which of the following nucleases is not used to encode information in the human
genome? - ANSWER-Uracil
(because uracil is not found in DNA)
Which of the following statements best describes the termination of transcription in
prokaryotes? - ANSWER-RNA polymerase transcribes to the terminator sequence,
causing the polymerase to separate from the DNA and release the transcript.
Which of the following statements about the genetic code is FALSE? - ANSWER-All
combinations of 3 bases in mRNA encode for an amino acid.
In the process of transcription: - ANSWER-the DNA template strand is being read
, According to the central dogma of molecular biology, what molecule should go in
the blank?
DNA -> mRNA -> _______ - ANSWER-protein
Which of the following is NOT a stage of transcription? - ANSWER-synthesis
Stages of Transcription - ANSWER-Initiation
Elongation
Termination
Alternate RNA splicing ________. - ANSWER-can allow the production of proteins of
different sizes and functions from a single mRNA.
Keratin is a protein that is made up of two compactly folded protein chains that
contain alpha helices. What is the HIGHEST level of protein structure observed in
Keratin? - ANSWER-Quaternary Structure.
Which of the following does not occur in prokaryotic gene expression, but does
occur in eukaryotic gene expression? - ANSWER-Introns are spliced out of the
mRNA.
Repressors for eukaryotic genes typically bind to sequences known as: - ANSWER-
Silencers
A neuron and a liver cell both contain the gene for the dopamine transporter, yet
the protein is only found in neurons. The main reason for this is: - ANSWER-Only
the neurons have the correct activator proteins for the dopamine transporter gene.
General transcription factors for eukaryotic genes typically bind to sequences
known as: - ANSWER-Promoters.
During transcription, which of the following steps is not observed? - ANSWER-RNA
polymerase reads the template strand in the 5' to 3' direction.
All of the following proteins involved in eukaryotic gene expression bind directly to
DNA EXCEPT: - ANSWER-Mediator proteins.
An Asn tRNA has all of the following elements in its folded structure EXCEPT: -
ANSWER-deoxyribose sugars
Which of the following, if missing, would usually prevent translation from initiating
in prokaryotes? - ANSWER-a ribosome binding sequence.
When does the termination of translation take place? - ANSWER-A stop codon is
reached.
Answer
If DNA from an organism is analyzed it is found that the thymidine nucleobases
makes up 20% of the total. What % of the nucleobases are adenine? - ANSWER-
20%
It became apparent to Watson and Crick after completion of their model that the
DNA molecule could carry a vast amount of hereditary information in which of the
following? - ANSWER-Sequence of Bases
Which of the following descriptions best fits the class of molecules known as
nucleotides? - ANSWER-A nitrogenous base, a phosphate group, and a sugar.
Which of the following statements is consistent with the Watson and Crick model of
DNA? - ANSWER-The pyrimidine and purine in each base pair come from opposite
strands.
If radioactive thymidine is added to cells, what macromolecules will be labeled? -
ANSWER-DNA
What component of amino acid structure varies among different amino acids? -
ANSWER-The components of the R-group.
The chemical linkage between two amino acids is known as a... - ANSWER-Peptide
bond.
Which level of protein structure do the alpha-helix and beta-pleated sheet
represent? - ANSWER-Secondary
When amino acids polymerize to form a protein: - ANSWER-A covalent bond forms
between the amino group of one amino acid and the carboxylic acid of a second.
Which of the following nucleases is not used to encode information in the human
genome? - ANSWER-Uracil
(because uracil is not found in DNA)
Which of the following statements best describes the termination of transcription in
prokaryotes? - ANSWER-RNA polymerase transcribes to the terminator sequence,
causing the polymerase to separate from the DNA and release the transcript.
Which of the following statements about the genetic code is FALSE? - ANSWER-All
combinations of 3 bases in mRNA encode for an amino acid.
In the process of transcription: - ANSWER-the DNA template strand is being read
, According to the central dogma of molecular biology, what molecule should go in
the blank?
DNA -> mRNA -> _______ - ANSWER-protein
Which of the following is NOT a stage of transcription? - ANSWER-synthesis
Stages of Transcription - ANSWER-Initiation
Elongation
Termination
Alternate RNA splicing ________. - ANSWER-can allow the production of proteins of
different sizes and functions from a single mRNA.
Keratin is a protein that is made up of two compactly folded protein chains that
contain alpha helices. What is the HIGHEST level of protein structure observed in
Keratin? - ANSWER-Quaternary Structure.
Which of the following does not occur in prokaryotic gene expression, but does
occur in eukaryotic gene expression? - ANSWER-Introns are spliced out of the
mRNA.
Repressors for eukaryotic genes typically bind to sequences known as: - ANSWER-
Silencers
A neuron and a liver cell both contain the gene for the dopamine transporter, yet
the protein is only found in neurons. The main reason for this is: - ANSWER-Only
the neurons have the correct activator proteins for the dopamine transporter gene.
General transcription factors for eukaryotic genes typically bind to sequences
known as: - ANSWER-Promoters.
During transcription, which of the following steps is not observed? - ANSWER-RNA
polymerase reads the template strand in the 5' to 3' direction.
All of the following proteins involved in eukaryotic gene expression bind directly to
DNA EXCEPT: - ANSWER-Mediator proteins.
An Asn tRNA has all of the following elements in its folded structure EXCEPT: -
ANSWER-deoxyribose sugars
Which of the following, if missing, would usually prevent translation from initiating
in prokaryotes? - ANSWER-a ribosome binding sequence.
When does the termination of translation take place? - ANSWER-A stop codon is
reached.
