Biology Chapter 16 Test Review

In a nucleosome, the DNA is wrapped around

histones

In analyzing the number of different bases in a DNA sample, which result would be consistent with the base-pairing rules?

A+G=C+T

A biochemist isolates, purifies and combines in a test tube a variety of molecules needed for DNA replication. When she adds some DNA to the mixture, replication occurs, but with each DNA molecule consists of a normal strand paired with numerous segments of DNA a few hundred nucleotides long. What has she probably left out of the mixture?

DNA ligase

What is the basis for the difference in how the leading and lagging strand of DNA molecules are synthesized?

DNA polymerase can join new nucleotides only to the 3' end of a pre-existing strand

The elongation of the leading strand during DNA synthesis

depends on the action of DNA polymerase

The spontaneous loss of amino groups from adenine in DNA results in hypoxanthine, an uncommon base, opposite thymine. What combination of proteins could repair such damage?

nuclease, DNA polymerase and DNA ligase

In his work with pneumonia-causing bacteria and mice, Griffith found that?

some substance from pathogenic cells was transferred to nonpathogenic cells, making them pathogenic