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Questions and Answers
Why did Avery, MacLeod, and McCarty's transformation experiment only show DNA as the hereditary molecule?
Why did Avery, MacLeod, and McCarty's transformation experiment only show DNA as the hereditary molecule?
- The experiment was conducted without proper controls
- They used living organisms instead of in vitro conditions
- Protein was removed as a possible transformation factor (correct)
- RNA was removed as a possible transformation factor
What was the significance of using radioactive isotopes of sulfur and phosphorus in the Hershey and Chase experiment?
What was the significance of using radioactive isotopes of sulfur and phosphorus in the Hershey and Chase experiment?
- To observe which molecules enter bacterial cells during infection
- To determine the toxicity of radioactive elements on bacteria
- To track the involvement of sulfur and phosphorus in DNA and protein synthesis (correct)
- To understand how radioactive elements transform DNA
Based on the Griffith experiments, which scenario would NOT support the conclusion of a transformation factor responsible for heredity?
Based on the Griffith experiments, which scenario would NOT support the conclusion of a transformation factor responsible for heredity?
- Isolation of living S-iii from a blood sample
- Heated S-iii and living R-II resulted in mouse death
- Living R-II bacteria coexisting with non-heated S-iii bacteria (correct)
- S-iii bacteria transforming into R-II bacteria upon contact
What role did bacterial cultures play in the Hershey and Chase experiment?
What role did bacterial cultures play in the Hershey and Chase experiment?
In the Hershey and Chase experiment, why was it important that sulfur is only present in proteins and not in DNA?
In the Hershey and Chase experiment, why was it important that sulfur is only present in proteins and not in DNA?
Which statement best summarizes the outcome of Griffith's experiments regarding the transformation factor?
Which statement best summarizes the outcome of Griffith's experiments regarding the transformation factor?
What is the name of the bond that joins one nucleotide to another in the DNA strand 5'-ATCGACCTGATC-3'?
What is the name of the bond that joins one nucleotide to another in the DNA strand 5'-ATCGACCTGATC-3'?
What is the sequence of the other strand in the DNA duplex with the sequence 5'-ATCGACCTGATC-3'?
What is the sequence of the other strand in the DNA duplex with the sequence 5'-ATCGACCTGATC-3'?
What term is used to describe the pattern of base pairing between one DNA strand and its partner in a duplex?
What term is used to describe the pattern of base pairing between one DNA strand and its partner in a duplex?
In the DNA fragment 5'-ACGTAGAGTGCTC-3' 3'-TGCATCTCACGAG-5', how many covalent bonds are present between nucleotides?
In the DNA fragment 5'-ACGTAGAGTGCTC-3' 3'-TGCATCTCACGAG-5', how many covalent bonds are present between nucleotides?
Which normal major event of DNA replication can the temperature-sensitive mutant 2 complete at 40°C?
Which normal major event of DNA replication can the temperature-sensitive mutant 2 complete at 40°C?
Which molecule is most likely carrying the temperature-sensitive mutation in temperature-sensitive mutant 1?
Which molecule is most likely carrying the temperature-sensitive mutation in temperature-sensitive mutant 1?
What is the polarity of the leading and lagging strands in a DNA replication fork?
What is the polarity of the leading and lagging strands in a DNA replication fork?
What is the sequence and polarity of the DNA duplex fragment deduced from the dideoxy DNA sequencing gel?
What is the sequence and polarity of the DNA duplex fragment deduced from the dideoxy DNA sequencing gel?
Which model of DNA replication was excluded by Meselson and Stahl's experiment?
Which model of DNA replication was excluded by Meselson and Stahl's experiment?
Which normal major event of DNA replication can the temperature-sensitive mutant 1 complete at 40°C?
Which normal major event of DNA replication can the temperature-sensitive mutant 1 complete at 40°C?
What is the primary reason why eukaryotic genomes, like Drosophila, require multiple origins of replication, while bacterial genomes, like E. coli, have only a single origin?
What is the primary reason why eukaryotic genomes, like Drosophila, require multiple origins of replication, while bacterial genomes, like E. coli, have only a single origin?
What is the primary reason for the shortening of telomeres in each replication cycle?
What is the primary reason for the shortening of telomeres in each replication cycle?
What is the primary function of the enzyme telomerase?
What is the primary function of the enzyme telomerase?
If a double-stranded DNA sample contains 20% cytosine, what is the percentage of thymine in the sample?
If a double-stranded DNA sample contains 20% cytosine, what is the percentage of thymine in the sample?
In the family pedigree described, what is the genetic term that best describes the pattern of inheritance of the DNA marker?
In the family pedigree described, what is the genetic term that best describes the pattern of inheritance of the DNA marker?
If DNA replication in early Drosophila embryos occurs every 5 minutes, and the Drosophila genome contains approximately 1.8 x 10^8 base pairs, approximately how many origins of replication are required for this rate of replication?
If DNA replication in early Drosophila embryos occurs every 5 minutes, and the Drosophila genome contains approximately 1.8 x 10^8 base pairs, approximately how many origins of replication are required for this rate of replication?
If DNA polymerase III lost its 5' to 3' polymerase activity due to a mutation, what would be the effect on DNA replication?
If DNA polymerase III lost its 5' to 3' polymerase activity due to a mutation, what would be the effect on DNA replication?
If DNA polymerase III lost its 3' to 5' exonuclease activity due to a mutation, what would be the effect on DNA replication?
If DNA polymerase III lost its 3' to 5' exonuclease activity due to a mutation, what would be the effect on DNA replication?
What is the sequence composition of telomeres in most eukaryotic organisms?
What is the sequence composition of telomeres in most eukaryotic organisms?
Why is telomerase generally active in germ-line cells but not in somatic cells?
Why is telomerase generally active in germ-line cells but not in somatic cells?
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