IAG_14.docx IAG_14.docx IAG_14.docx
OpenStax Biology 2e Instructor Answer Guide
Biology 2e
Unit 3: Genetics
Chapter 14: DNA Structure and Function
Visual Connection Questions
1. In eukaryotic cells, DNA and RNA synthesis occur in a separate compartment from protein
synthesis. In prokaryotic cells, both processes occur together. What advantages might there be
to separating the processes? What advantages might there be to having them occur together?
Compartmentalization enables a eukaryotic cell to divide processes into discrete steps so it can
build more complex protein and RNA products. But there is an advantage to having a single
compartment as well: RNA and protein synthesis occurs much more quickly in a prokaryotic
cell.
2. You isolate a cell strain in which the joining together of Okazaki fragments is impaired and
suspect that a mutation has occurred in an enzyme found at the replication fork. Which enzyme
is most likely to be mutated?
DNA ligase, as this enzyme joins together Okazaki fragments.
IAG_14.docx IAG_14.docx IAG_14.docx
, IAG_14.docx IAG_14.docx IAG_14.docx
OpenStax Biology 2e Instructor Answer Guide
3. A frameshift mutation that results in the insertion of three nucleotides is often less
deleterious than a mutation that results in the insertion of one nucleotide. Why?
If three nucleotides are added, one additional amino acid will be incorporated into the protein
chain, but the reading frame wont shift.
Review Questions
4. If DNA of a particular species was analyzed and it was found that it contains 27 percent A,
what would be the percentage of C?
c. 23 percent
5. The experiments by Hershey and Chase helped confirm that DNA was the hereditary material
on the basis of the finding that:
d. radioactive phosphorus was found in the cell
6. Bacterial transformation is a major concern in many medical settings. Why might health care
providers be concerned?
d. All of the above.
7. DNA double helix does not have which of the following?
d. uracil
8. In eukaryotes, what is the DNA wrapped around?
d. histones
9. Meselson and Stahl's experiments proved that DNA replicates by which mode?
b. semi-conservative
IAG_14.docx IAG_14.docx IAG_14.docx
OpenStax Biology 2e Instructor Answer Guide
Biology 2e
Unit 3: Genetics
Chapter 14: DNA Structure and Function
Visual Connection Questions
1. In eukaryotic cells, DNA and RNA synthesis occur in a separate compartment from protein
synthesis. In prokaryotic cells, both processes occur together. What advantages might there be
to separating the processes? What advantages might there be to having them occur together?
Compartmentalization enables a eukaryotic cell to divide processes into discrete steps so it can
build more complex protein and RNA products. But there is an advantage to having a single
compartment as well: RNA and protein synthesis occurs much more quickly in a prokaryotic
cell.
2. You isolate a cell strain in which the joining together of Okazaki fragments is impaired and
suspect that a mutation has occurred in an enzyme found at the replication fork. Which enzyme
is most likely to be mutated?
DNA ligase, as this enzyme joins together Okazaki fragments.
IAG_14.docx IAG_14.docx IAG_14.docx
, IAG_14.docx IAG_14.docx IAG_14.docx
OpenStax Biology 2e Instructor Answer Guide
3. A frameshift mutation that results in the insertion of three nucleotides is often less
deleterious than a mutation that results in the insertion of one nucleotide. Why?
If three nucleotides are added, one additional amino acid will be incorporated into the protein
chain, but the reading frame wont shift.
Review Questions
4. If DNA of a particular species was analyzed and it was found that it contains 27 percent A,
what would be the percentage of C?
c. 23 percent
5. The experiments by Hershey and Chase helped confirm that DNA was the hereditary material
on the basis of the finding that:
d. radioactive phosphorus was found in the cell
6. Bacterial transformation is a major concern in many medical settings. Why might health care
providers be concerned?
d. All of the above.
7. DNA double helix does not have which of the following?
d. uracil
8. In eukaryotes, what is the DNA wrapped around?
d. histones
9. Meselson and Stahl's experiments proved that DNA replicates by which mode?
b. semi-conservative
IAG_14.docx IAG_14.docx IAG_14.docx
