Question 1

Linus Pauling proposed at one time that the DNA molecule was,in fact,a triple helix.If so,how would this situation affect cellular division?

Accepted Answer

A)  The triple-helix DNA could be replicated and passed on to daughter cells as it normally would.
B)  The triple-helix DNA could be replicated normally in mitosis but not meiosis.
C)  Sperm and eggs produced by triple-helix DNA would be more fertile.
D)  The fact that the DNA had three nucleotide strands would make it difficult to replicate the DNA and reassemble the copies.E) A) and B)
F) A) and C)

Question 2

Telomerase activity relies upon ________________ for appropriate priming.

Accepted Answer

A)  RNA primase
B)  a short,telomeric RNA sequence that is carried within its structure
C)  a primosome subunit associated with the telomere structure
D)  a unique protein-based primer
E)  DNA polymerase III holoenzymeF) B) and E)
G) A) and B)

Question 3

Experiments on chromosome structure and function have shown that in eukaryotic chromatids:

Accepted Answer

A)  there are at least 50 DNA molecules per chromatid.
B)  there is more than one DNA replicating point per chromatid.
C)  DNA molecules duplicate conservatively rather than semiconservatively.
D)  DNA segregation to daughter chromatids occurs in a dispersive pattern.
E)  most DNA synthesis occurs during the M (mitosis) phase of the cell cycle.F) A) and B)
G) D) and E)

Question 4

If Escherichia coli,grown for a period of time in 15N,is transferred to 14N for one generation of DNA replication,the resulting DNA should have 14N added to all "new" DNA.If conservative replication is occurring,the 14N-containing "new" DNA will compose:

Accepted Answer

A)  one strand of all bacterial chromosomes.
B)  both strands of DNA in half of all bacterial chromosomes.
C)  regions dispersed throughout all bacterial DNA.
D)  none of the new DNA;it will only be found in the old DNA.
E)  All of the answer options are correct.F) None of the above
G) B) and C)

Question 5

Alfred Hershey and Martha Chase examined transformation using bacteriophage (bacterial DNA virus) and bacterial cells.In this experiment,how is transformation (altered phenotype) displayed?

Accepted Answer

A)  The bacteria are transformed (by phage DN
A)  into virus synthesizing cells.
B)  The bacteria are transformed from live to dead by the virus.
C)  The bacteria are transformed from rough to smooth by the virus.
D)  The bacteria are transformed into a virus.
E)  Transformation is not exhibited by a virus-infected bacterial cell.F) A) and B)
G) B) and E)

Question 6

If Escherichia coli,grown for a period of time in 15N,is transferred to 14N for one generation of DNA replication,the resulting DNA should have 14N added to all "new" DNA.If semiconservative replication is occurring,the 14N-containing "new" DNA will compose:

Accepted Answer

A)  one strand of all bacterial chromosomes.
B)  both strands of DNA in half of all bacterial chromosomes.
C)  regions dispersed throughout all bacterial DNA.
D)  none of the new DNA;it will only be found in the old DNA.
E)  None of the answer options are correct.F) None of the above
G) A) and D)

Question 7

Alfred Hershey and Martha Chase examined transformation using bacteriophage (bacterial DNA virus) and bacterial cells.In these experiments,they used radioactivity to label nucleic acids (in this case DNA) and proteins.What do radioactive sulfur and phosphate specifically label?

Accepted Answer

A)  Sulfur labels DNA,and phosphate labels protein.
B)  Sulfur labels both protein and DNA.
C)  Phosphate labels both protein and DNA.
D)  Sulfur labels protein,and phosphate labels DNA.
E)  None of the answer options are correct.F) A) and E)
G) A) and B)

Question 8

Which of the following conditions is/are associated with abnormal telomerase activity resulting in premature aging?

Accepted Answer

A)  Down syndrome
B)  Patau syndrome
C)  Cri-du chat syndrome
D)  Werner syndromeE) All of the above
F) C) and D)

Question 9

Alfred Hershey and Martha Chase examined transformation using bacteriophage (bacterial DNA virus) and bacterial cells.If phage are labeled with radioactive phosphate and allowed to infect bacterial cells,the radioactive phosphate will be localized to:

Accepted Answer

A)  the inside of infected cells (in phage DN
A)  .
B)  the outside of infected cells (in phage ghosts) .
C)  newly synthesized phage viruses in the host bacterial cell.
D)  No radioactivity will remain after infection.
E)  The phosphate will be metabolically consumed,and therefore the radioactivity will be destroyed.F) A) and C)
G) C) and E)

Question 10

When comparing the three key models of DNA replication,the model that included the synthesis of a brand new double-stranded DNA molecule from an original molecule was named:

Accepted Answer

A)  dispersive replication.
B)  conservative replication.
C)  semiconservative replication.
D)  liberal replication.
E)  None of the answer options are correct.F) B) and D)
G) A) and E)

Exam 7: Dna: Structure and Replication

Alfred Hershey and Martha Chase examined transformation using bacteriophage (bacterial DNA virus) and bacterial cells.In this experiment,how is transformation (altered phenotype) displayed?

Correct Answer
verified

Experiments on chromosome structure and function have shown that in eukaryotic chromatids:

Correct Answer
verified

Telomerase activity relies upon ________________ for appropriate priming.

Correct Answer
verified

Linus Pauling proposed at one time that the DNA molecule was,in fact,a triple helix.If so,how would this situation affect cellular division?

Correct Answer
verified

Alfred Hershey and Martha Chase examined transformation using bacteriophage (bacterial DNA virus) and bacterial cells.If phage are labeled with radioactive phosphate and allowed to infect bacterial cells,the radioactive phosphate will be localized to:

Correct Answer
verified

If Escherichia coli,grown for a period of time in ¹⁵N,is transferred to ¹⁴N for one generation of DNA replication,the resulting DNA should have ¹⁴N added to all "new" DNA.If semiconservative replication is occurring,the ¹⁴N-containing "new" DNA will compose:

Correct Answer
verified

Alfred Hershey and Martha Chase examined transformation using bacteriophage (bacterial DNA virus) and bacterial cells.In these experiments,they used radioactivity to label nucleic acids (in this case DNA) and proteins.What do radioactive sulfur and phosphate specifically label?

Correct Answer
verified

When comparing the three key models of DNA replication,the model that included the synthesis of a brand new double-stranded DNA molecule from an original molecule was named:

Correct Answer
verified

If Escherichia coli,grown for a period of time in ¹⁵N,is transferred to ¹⁴N for one generation of DNA replication,the resulting DNA should have ¹⁴N added to all "new" DNA.If conservative replication is occurring,the ¹⁴N-containing "new" DNA will compose:

Correct Answer
verified

Which of the following conditions is/are associated with abnormal telomerase activity resulting in premature aging?

Correct Answer
verified

Exam 7: Dna: Structure and Replication

Alfred Hershey and Martha Chase examined transformation using bacteriophage (bacterial DNA virus) and bacterial cells.In this experiment,how is transformation (altered phenotype) displayed?

Correct AnswerverifiedShow Answer

Experiments on chromosome structure and function have shown that in eukaryotic chromatids:

Correct AnswerverifiedShow Answer

Telomerase activity relies upon ________________ for appropriate priming.

Correct AnswerverifiedShow Answer

Linus Pauling proposed at one time that the DNA molecule was,in fact,a triple helix.If so,how would this situation affect cellular division?

Correct AnswerverifiedShow Answer

Alfred Hershey and Martha Chase examined transformation using bacteriophage (bacterial DNA virus) and bacterial cells.If phage are labeled with radioactive phosphate and allowed to infect bacterial cells,the radioactive phosphate will be localized to:

Correct AnswerverifiedShow Answer

If Escherichia coli,grown for a period of time in 15N,is transferred to 14N for one generation of DNA replication,the resulting DNA should have 14N added to all "new" DNA.If semiconservative replication is occurring,the 14N-containing "new" DNA will compose:

Correct AnswerverifiedShow Answer

Alfred Hershey and Martha Chase examined transformation using bacteriophage (bacterial DNA virus) and bacterial cells.In these experiments,they used radioactivity to label nucleic acids (in this case DNA) and proteins.What do radioactive sulfur and phosphate specifically label?

Correct AnswerverifiedShow Answer

When comparing the three key models of DNA replication,the model that included the synthesis of a brand new double-stranded DNA molecule from an original molecule was named:

Correct AnswerverifiedShow Answer

If Escherichia coli,grown for a period of time in 15N,is transferred to 14N for one generation of DNA replication,the resulting DNA should have 14N added to all "new" DNA.If conservative replication is occurring,the 14N-containing "new" DNA will compose:

Correct AnswerverifiedShow Answer

Which of the following conditions is/are associated with abnormal telomerase activity resulting in premature aging?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

If Escherichia coli,grown for a period of time in ¹⁵N,is transferred to ¹⁴N for one generation of DNA replication,the resulting DNA should have ¹⁴N added to all "new" DNA.If semiconservative replication is occurring,the ¹⁴N-containing "new" DNA will compose:

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

If Escherichia coli,grown for a period of time in ¹⁵N,is transferred to ¹⁴N for one generation of DNA replication,the resulting DNA should have ¹⁴N added to all "new" DNA.If conservative replication is occurring,the ¹⁴N-containing "new" DNA will compose:

Correct Answer
verified

Correct Answer
verified