Eukaryotes contain ________chromosomes, and prokaryotes contain a________ chromosome.
double-stranded linear; double-stranded circular
single-stranded circular; single-stranded linear
double-stranded circular; double-stranded linear
single-stranded linear; single-stranded circular
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?
Helicase
DNA Polymerase III
Topoisomerase
Ligase
DNA replicates by which of the following models?
None of these
Which enzyme is responsible for proofreading the nucleic acid bases and correcting potential errors?
Ligase
Helicase
Telomerase
DNA Polymerase
Which enzyme is responsible for infinite cell division in some cell lines?
Telomerase
DNA Polymerase
Helicase
Ligase
Use Chargaff's rule to explain the data in the table above.
Since the %A and the %T are approximately the same in each sample, adenine and thymine molecules must pair up in a double-stranded DNA molecule.
Since the %C and the %T add up to approximately 50 percent in each sample, cytosine and thymine molecules must both contain a single ring.
Since the %A and the %G add up to approximately 50 percent in each sample, adenine and guanine molecules must pair up in a double-stranded DNA molecule.
Since the %(A+T) is greater than the %(G+C) in each sample, DNA molecules must have a poly-A tail at one end.
If 40% of the nucleotides in a DNA molecule are guanine, then what percent are expected to be thymine?
40%
20%
10%
30%
Which of the following most accurately demonstrates DNA replication at the replication fork?
If DNA underwent 3 rounds of Replication, what percent of the total DNA present would be compromised of the original DNA molecule?
12.5%
0%
6.25%
25%
Which of the following sequences shown below would be the matching new strand of the following DNA sequence: 5'-GATTCAA-3'
5'-CTAAGUU-3'
3'-CTAAGTT-5'
5'-CTAAGUU-3'
3'-CUAAGUU-5'
Which of the following statements regarding DNA is NOT true?
Adenine and guanine are pyrimidines
One end of a single stranded molecule ends with a phospahte and the other end has a deoxyribose
The basic unit is a nucleotide that contains deoxyribose
Guanine and cytosine always form 3 hydrogen bonds
Below is a segment of replicating DNA.
Which Strand is the template for discontinuous (lagging) strand synthesis?