Question 1

How does histone acetylation affect chromatin?

Accepted Answer

A)  It loosens the chromatin and allows increased transcription.
B)  It allows DNA to become resistant to damage.
C)  It helps the histones have a greater affinity for DNA.
D)  It inhibits DNA replication by making it more difficult to separate the DNA strands.
E)  It causes the chromatin to become more condensed in preparation for metaphase.

Question 2

Which of the following has repetitive DNA and heterochromatin?

Accepted Answer

A)  Telomere
B)  Centromere
C)  Mitochondria
D)  Chloroplast
E)  Telomere and centromere

Question 3

DNA is said to be like a ladder where _____ connected by _____ bonds make up the sides of the ladder and the _____ connected by _____ bonds make up the rungs of the ladder.

Accepted Answer

A)  nitrogenous bases; covalent; sugar-phosphates; hydrogen
B)  sugar-phosphates; covalent; nitrogenous bases; hydrogen
C)  nitrogenous bases; hydrogen; sugar-phosphates; covalent
D)  sugar-phosphates; hydrogen; nitrogenous bases; covalent

Question 4

Which circle shows a bond that would also be found in an RNA transcribed from one strand of this DNA?

Accepted Answer

A)  Circle a
B)  Circle b
C)  Circle c
D)  Circle d

Question 5

While doing research on deep-sea vents, you discover a very simple new life form.After some initial analysis you find that this life form contains small fragments of DNA, small complementary RNA fragments, and proteins.Fortuitously, you collected two strains, one that is purple and one that is yellow.What experiments would you perform to determine which of these three cellular constituents serve as the genetic material in your new organism?

Accepted Answer

3'-TATCGTA...

Question 6

If a nucleic acid is found to contain 20% A and 20% T, the molecule is probably:

Accepted Answer

A)  single-stranded DNA.
B)  double-stranded DNA.
C)  single-stranded RNA.
D)  double-stranded RNA.

Question 7

A ribosomal RNA gene is an example of which type of DNA sequence in eukaryotes?

Accepted Answer

A)  Moderately repetitive DNA
B)  Highly repetitive DNA
C)  Short interspersed elements
D)  Long interspersed elements
E)  Unique-sequence DNA

Question 8

A double-stranded DNA molecule of 50 base pairs contains 15 cytosine bases (C) , how many thymine bases will it have?

Accepted Answer

A)  10
B)  15
C)  30
D)  35
E)  60

Question 9

A tRNA gene is an example of which type of DNA sequence in eukaryotes?

Accepted Answer

A)  Moderately repetitive DNA
B)  Highly repetitive DNA
C)  Short interspersed elements
D)  Long interspersed elements
E)  Unique-sequence DNA

Question 10

If a bacterial chromosome were inserted into a eukaryotic cell, would it be stable? Would it segregate like eukaryotic chromosomes do during mitosis and meiosis? Why or why not?

Accepted Answer

No, it would not be stable because: (1)i...

Question 11

Which diagram shows a nucleotide with a purine base?

Accepted Answer

A)  Diagram A
B)  Diagram B
C)  Diagram C
D)  Diagram D
E)  Diagram E

Question 12

Indicate which of the following statements is FALSE.

Accepted Answer

A)  Covalent bonds connect nucleotides in a strand; noncovalent interactions hold strands into a double-stranded structure.
B)  Uracil is similar to thymine except that uracil lacks a methyl group on the carbon at position 5 on the carbon-nitrogen ring.
C)  Frederick Griffith demonstrated that a transforming chemical from dead bacteria could change the genetic information of living bacteria.
D)  Avery, MacLeod, and McCarty showed that DNA is the genetic information of cells and that RNA is the genetic information of viruses.
E)  The pyrimidine bases in nucleic acids are cytosine, thymine, and uracil.

Question 13

Hershey and Chase determined whether DNA or protein was the genetic material in bacteriophages.What isotope did they use to label the viral protein?

Accepted Answer

A)  14C
B)  15N
C)  18O
D)  32P
E)  35S

Question 14

If a DNA molecule is 30% cytosine (C) , what is the percentage of guanine (G) ?

Accepted Answer

A)  30%
B)  60%
C)  35%
D)  70%
E)  15%

Question 15

Which of the following is an example of an epigenetic change in eukaryotes?

Accepted Answer

A)  A loss of an AT base pair from a gene
B)  The addition of methyl groups to cytosines in the promoter region of a gene
C)  The substitution of an AT base pair by a GC base pair in a gene as a result of a mistake during DNA replication
D)  A deletion that simultaneously removes two genes from the genome
E)  None of the above represents epigenetic changes.

Question 16

There are some genomes that have been reported to be positively coiled instead of negatively supercoiled, which is the status of most genomes that we have studied.The genomes that are positively supercoiled seem to belong to viruses and cells that exist at very high temperatures.Why might positive supercoiling be an advantage at high temperatures?

Accepted Answer

Negative supercoiling makes it easier fo...

Question 17

Imagine you forgot to cap your DNA sample and it became desiccated (dried out) .What form would the DNA take?

Accepted Answer

A)  A-DNA
B)  B-DNA
C)  C-DNA
D)  H-DNA
E)  Z-DNA

Question 18

How does the organization of the eukaryotic chromosome differ from the organization of a bacterial chromosome? Include in your

Accepted Answer

a.Bacterial chromosomes generally consis...

Question 19

Which of the following is NOT characteristic of A-form DNA compared to B- or Z-form DNA?

Accepted Answer

A)  Has right-handed helixes
B)  Exists when less water is present
C)  Is long and narrow
D)  Has 50% purines, 50% pyrimidines
E)  Has a deeper major groove and a narrower minor groove

Question 20

You are a research assistant in a lab that studies nucleic acids.Your advisor gave you four tubes for analysis.Each of these tubes differs in its contents by the source of its nucleic acids: mouse cytoplasm (single-stranded RNA) , yeast nuclei (double-stranded DNA) , rotavirus (double-stranded RNA) , and parvovirus (single-stranded DNA) .The approximate nucleotide base composition of each sample is given in the table below.  Which tube MOST likely contains mouse cytoplasm?

Accepted Answer

A)  Tube 1
B)  Tube 2
C)  Tube 3
D)  Tube 4

Exam 8: DNA- the Chemical Nature of the Gene

If a DNA molecule is 30% cytosine (C) , what is the percentage of guanine (G) ?

Correct Answer
verified

Which of the following is NOT characteristic of A-form DNA compared to B- or Z-form DNA?

Correct Answer
verified

DNA is said to be like a ladder where ___ connected by _ bonds make up the sides of the ladder and the _ connected by ___ bonds make up the rungs of the ladder.

Correct Answer
verified

Correct Answer
verified

How does histone acetylation affect chromatin?

Correct Answer
verified

Indicate which of the following statements is FALSE.

Correct Answer
verified

If a bacterial chromosome were inserted into a eukaryotic cell, would it be stable? Would it segregate like eukaryotic chromosomes do during mitosis and meiosis? Why or why not?

Correct Answer
verified
No, it would not be stable because: (1)i...
View Answer

Which of the following is an example of an epigenetic change in eukaryotes?

Correct Answer
verified

How does the organization of the eukaryotic chromosome differ from the organization of a bacterial chromosome? Include in your

Correct Answer
verified
a.Bacterial chromosomes generally consis...
View Answer

If a nucleic acid is found to contain 20% A and 20% T, the molecule is probably:

Correct Answer
verified

Correct Answer
verified
Negative supercoiling makes it easier fo...
View Answer

A double-stranded DNA molecule of 50 base pairs contains 15 cytosine bases (C) , how many thymine bases will it have?

Correct Answer
verified

Which circle shows a bond that would also be found in an RNA transcribed from one strand of this DNA?

Correct Answer
verified

Which diagram shows a nucleotide with a purine base?

Correct Answer
verified

A ribosomal RNA gene is an example of which type of DNA sequence in eukaryotes?

Correct Answer
verified

Correct Answer
verified
3'-TATCGTA...
View Answer

Which of the following has repetitive DNA and heterochromatin?

Correct Answer
verified

Imagine you forgot to cap your DNA sample and it became desiccated (dried out) .What form would the DNA take?

Correct Answer
verified

A tRNA gene is an example of which type of DNA sequence in eukaryotes?

Correct Answer
verified

Hershey and Chase determined whether DNA or protein was the genetic material in bacteriophages.What isotope did they use to label the viral protein?

Correct Answer
verified

Exam 8: DNA- the Chemical Nature of the Gene

If a DNA molecule is 30% cytosine (C) , what is the percentage of guanine (G) ?

Correct AnswerverifiedShow Answer

Which of the following is NOT characteristic of A-form DNA compared to B- or Z-form DNA?

Correct AnswerverifiedShow Answer

DNA is said to be like a ladder where _____ connected by _____ bonds make up the sides of the ladder and the _____ connected by _____ bonds make up the rungs of the ladder.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

How does histone acetylation affect chromatin?

Correct AnswerverifiedShow Answer

Indicate which of the following statements is FALSE.

Correct AnswerverifiedShow Answer

If a bacterial chromosome were inserted into a eukaryotic cell, would it be stable? Would it segregate like eukaryotic chromosomes do during mitosis and meiosis? Why or why not?

Correct AnswerverifiedNo, it would not be stable because: (1)i...View AnswerShow Answer

Which of the following is an example of an epigenetic change in eukaryotes?

Correct AnswerverifiedShow Answer

How does the organization of the eukaryotic chromosome differ from the organization of a bacterial chromosome? Include in your

Correct Answerverifieda.Bacterial chromosomes generally consis...View AnswerShow Answer

If a nucleic acid is found to contain 20% A and 20% T, the molecule is probably:

Correct AnswerverifiedShow Answer

Correct AnswerverifiedNegative supercoiling makes it easier fo...View AnswerShow Answer

A double-stranded DNA molecule of 50 base pairs contains 15 cytosine bases (C) , how many thymine bases will it have?

Correct AnswerverifiedShow Answer

Which circle shows a bond that would also be found in an RNA transcribed from one strand of this DNA?

Correct AnswerverifiedShow Answer

Which diagram shows a nucleotide with a purine base?

Correct AnswerverifiedShow Answer

A ribosomal RNA gene is an example of which type of DNA sequence in eukaryotes?

Correct AnswerverifiedShow Answer

Correct Answerverified3'-TATCGTA...View AnswerShow Answer

Which of the following has repetitive DNA and heterochromatin?

Correct AnswerverifiedShow Answer

Imagine you forgot to cap your DNA sample and it became desiccated (dried out) .What form would the DNA take?

Correct AnswerverifiedShow Answer

A tRNA gene is an example of which type of DNA sequence in eukaryotes?

Correct AnswerverifiedShow Answer

Hershey and Chase determined whether DNA or protein was the genetic material in bacteriophages.What isotope did they use to label the viral protein?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

DNA is said to be like a ladder where ___ connected by _ bonds make up the sides of the ladder and the _ connected by ___ bonds make up the rungs of the ladder.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
No, it would not be stable because: (1)i...
View Answer

Correct Answer
verified

Correct Answer
verified
a.Bacterial chromosomes generally consis...
View Answer

Correct Answer
verified

Correct Answer
verified
Negative supercoiling makes it easier fo...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
3'-TATCGTA...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified