AP BIOLOGY UNIT 6 TEST
What enhances the expression of a gene? - Correct Answers -the attachment of RNA
polymerase to DNA
Describe what happens when the lactose operon is turned on and transcribing. - Correct
Answers -Allolactose or lactose binds to and changes the shape of the repressor.
Genes A,B,C, and D are located on the same chromosome. Testcrosses show that the
recombination frequency between A and B is 36% and between A and C is 23%. The
recombination frequency between C and D is 5% and between A and D is 18%. What is
the correct sequence of the genes on the chromosome? - Correct Answers -ADCB
The number of active copies of a gene is important to proper development. Describe a
normal process to establish proper dosage in a cell. - Correct Answers -Methylation of
the X Chromosome
Which mutation would likely be most harmful to an organism? - Correct Answers -a
single nucleotide deletion close to the start of the coding sequence
In analyzing the number of different bases in a DNA sample, which result would be
consistent with the base-pairing rules? - Correct Answers -A + G = C + T
Why do we do Electrophoresis? - Correct Answers -to separate DNA molecules based
on size and charge
Why do we do Polymerase chain reaction (PCR)? - Correct Answers -to amplify (copy)
a piece of DNA very quickly
The findings from the Human Genome Project reveal that humans have only about
22,000 genes, the same as a roundworm. Explain the best you can why the more
complex humans have so few genes? - Correct Answers -More than one polypeptide
can be produced from one gene
What is the process by which DNA makes mRNA? - Correct Answers -Transcription
What is the process by which DNA is synthesized from a template strand? - Correct
Answers -Replication
What is the process by which foreign DNA is taken up by a bacterial cell? - Correct
Answers -Transformation
, What is the process by which a polypeptide strand is synthesized using mRNA as a
template? - Correct Answers -Translation
What is EcoRI? - Correct Answers -a restriction enzyme
What is the role of DNA polymerase during DNA Replication? - Correct Answers -To
build a new strand of DNA from 5' to 3'
What can DNA replication best be described as? - Correct Answers -semiconservative
Who discovered transformation in bacteria? - Correct Answers -Frederick Griffith
Who proved that DNA replicates by semiconservative replication? - Correct Answers -
Meselson and Stahl
Who proved that the nuclear material in a bacteriophage, not the protein coat, infects a
bacterium? - Correct Answers -Hershey and Chase
Who was the first to analyze DNA by X-ray crystallography? - Correct Answers -
Rosalind Franklin
If a segment of DNA is 5'-TGA AGA CCG-3', what will the RNA that results from the
transcription of the segment be? - Correct Answers -3'-ACT TCT GGC-5'
Once transcribed, eukaryotic mRNA typically undergoes substantial alteration. What
does it result from? - Correct Answers -removal of introns
Which of the following contain a pyrimidine and a purine?
(a) adenine and guanine
(b) uracil and thymine
(c) cytosine and uracil
(d) adenine and cytosine - Correct Answers -(d) adenine and cytosine
What happens when T7 bacteriophages are grown in radioactive phosphorus? - Correct
Answers -their DNA becomes radioactive
What acts as a primer that initiates the synthesis of a new strand of DNA? - Correct
Answers -RNA
if guanine makes up 28% of the nucleotides in a sample of DNA from an organism, then
what percentage of thymine would make up the nucleotides? - Correct Answers -22%
If AAU is the codon, what is the anticodon? - Correct Answers -UAA
What is the anticondon of AAA? - Correct Answers -AAA
What enhances the expression of a gene? - Correct Answers -the attachment of RNA
polymerase to DNA
Describe what happens when the lactose operon is turned on and transcribing. - Correct
Answers -Allolactose or lactose binds to and changes the shape of the repressor.
Genes A,B,C, and D are located on the same chromosome. Testcrosses show that the
recombination frequency between A and B is 36% and between A and C is 23%. The
recombination frequency between C and D is 5% and between A and D is 18%. What is
the correct sequence of the genes on the chromosome? - Correct Answers -ADCB
The number of active copies of a gene is important to proper development. Describe a
normal process to establish proper dosage in a cell. - Correct Answers -Methylation of
the X Chromosome
Which mutation would likely be most harmful to an organism? - Correct Answers -a
single nucleotide deletion close to the start of the coding sequence
In analyzing the number of different bases in a DNA sample, which result would be
consistent with the base-pairing rules? - Correct Answers -A + G = C + T
Why do we do Electrophoresis? - Correct Answers -to separate DNA molecules based
on size and charge
Why do we do Polymerase chain reaction (PCR)? - Correct Answers -to amplify (copy)
a piece of DNA very quickly
The findings from the Human Genome Project reveal that humans have only about
22,000 genes, the same as a roundworm. Explain the best you can why the more
complex humans have so few genes? - Correct Answers -More than one polypeptide
can be produced from one gene
What is the process by which DNA makes mRNA? - Correct Answers -Transcription
What is the process by which DNA is synthesized from a template strand? - Correct
Answers -Replication
What is the process by which foreign DNA is taken up by a bacterial cell? - Correct
Answers -Transformation
, What is the process by which a polypeptide strand is synthesized using mRNA as a
template? - Correct Answers -Translation
What is EcoRI? - Correct Answers -a restriction enzyme
What is the role of DNA polymerase during DNA Replication? - Correct Answers -To
build a new strand of DNA from 5' to 3'
What can DNA replication best be described as? - Correct Answers -semiconservative
Who discovered transformation in bacteria? - Correct Answers -Frederick Griffith
Who proved that DNA replicates by semiconservative replication? - Correct Answers -
Meselson and Stahl
Who proved that the nuclear material in a bacteriophage, not the protein coat, infects a
bacterium? - Correct Answers -Hershey and Chase
Who was the first to analyze DNA by X-ray crystallography? - Correct Answers -
Rosalind Franklin
If a segment of DNA is 5'-TGA AGA CCG-3', what will the RNA that results from the
transcription of the segment be? - Correct Answers -3'-ACT TCT GGC-5'
Once transcribed, eukaryotic mRNA typically undergoes substantial alteration. What
does it result from? - Correct Answers -removal of introns
Which of the following contain a pyrimidine and a purine?
(a) adenine and guanine
(b) uracil and thymine
(c) cytosine and uracil
(d) adenine and cytosine - Correct Answers -(d) adenine and cytosine
What happens when T7 bacteriophages are grown in radioactive phosphorus? - Correct
Answers -their DNA becomes radioactive
What acts as a primer that initiates the synthesis of a new strand of DNA? - Correct
Answers -RNA
if guanine makes up 28% of the nucleotides in a sample of DNA from an organism, then
what percentage of thymine would make up the nucleotides? - Correct Answers -22%
If AAU is the codon, what is the anticodon? - Correct Answers -UAA
What is the anticondon of AAA? - Correct Answers -AAA
