BIO chapter 13 dsm

One strand of a double-stranded DNA molecule has the base sequence 5' ATAGGT-3. The complimentary base sequence will be 3' ________-5'

TACCA

which of the following lists is in order from the entity with the smallest genome to the entity with the largest genome?

Virus, bacteria, eukaryote

Chargoff found that DNA samples, ____________.

the ratio of A to T is close to 1:1 and the ratio of G to C is close to 1:1

The unwinding of DNA at the replication fork causes twisting and strain in the DNA ahead of the fork, which is relieved by an enzyme called _______.

topoisomerase

Avery and his colleagues' 1944 experiment showed that DNA __________.

was the substance that transformed the bacteria in Griffith's experiment

The overall error rate in completed DNA molecule is approximately _______.

one error per 10,000,000,000

The two stands of a DNA double helix are antiparallel. This means that_____.

one strand runs in the 5' to 3' direction and the other runs in the 3' to 5' direction

the experiments of Meselson and Stahl showed that DNA ____________.

replicates in a semiconservative fashion

who is credited with discovering the DNA double helix?

Watson and Crick

the incorporation of an incorrect base into a DNA molecule during DNA replication ______________.

can be repaired by the mismatch repair system

During Griffith's experiments with Streptococcus pneumoniae in mice, material from __________ bacteria transformed __________ bacteria.

heat-killed virulent; living nonvirulent

DNA polymerase adds nucleotides to the __________ of the leading strands and to the __________ of the lagging strands (Okazaki fragments).

3' end; 3' end

What enzyme joins Okazaki fragments?

DNA ligase

which of the following components is required for DNA replication?

RNA Primers

once the DNA at the replication fork is unwound by helices, what prevents the two strands from coming back together to re-form a double helix?

Single-strand binding proteins bind the unwound DNA and prevent the double helix from re-forming.

A scientist assembles a bacteriophage with the protein coat of phage T2 and the DNA of phage T4. If this composite phage were allowed to infect a bacterium, the phages produced in the host cell would have __________.

The protein and DNA of T4

What technique was most helpful to Watson and Crick in developing their model for the structure of DNA

X-ray crystallography

in DNA, the two purines are _______, and the two pyrimidines are _____________.

adenine and guanine, cytosine and thymine

Which of the following statements concerning DNA is true?

adenine forms two hydrogen bonds with thymine; guanine forms three hydrogen bonds with cytosine

Why were many of the early experiments on DNA carried out on viruses and bacteria?

all of the listed responses are correct

which of the following statements about origins of replication is correct?

all of the listed responses are correct

the role of dan polymerases in DNA replication is to ______

attach free nucleotides to the new dna strand

what is the major difference between bacterial chromosomes and eukaryotes chromosomes?

bacteria have a singular circular chromosome, whereas eukaryotes have several linear chromosomes

The rate of elongation in prokaryotes is _____ the rate in eukaryotes.

much faster than

The "beads on a string" seen in interphase chromatin are

nucleosomes