Chapter 15 HW - Mastering Biology Questions with Solutions

Chapter 15 HW - Mastering Biology

Phage
This is a T2 phage, a type of phage that infects E. coli. - answer

Who demonstrated that DNA is the genetic material of the T2 phage? - answer Hershey
and Chase

- Hershey and Chase did a series of classic experiments demonstrating that DNA is the
genetic material of the T2 phage.

The radioactive isotope 32P labels the T2 phage's _____. - answerDNA

- The T2 phage consists of a protein coat and DNA. It is the DNA that contains P.

Hershey and Chase used _____ to radioactively label the T2 phage's proteins. -
answer35S

- Hershey and Chase used radioactive sulfur to label the phage's proteins.

After allowing phages grown with bacteria in a medium that contained 32P and 35S,
Hershey and Chase used a centrifuge to separate the phage ghosts from the infected
cell. They then examined the infected cells and found that they contained _____, which
demonstrated that _____ is the phage's genetic material. - answerlabeled DNA...DNA

- Since the phage DNA entered the infected cell, it makes sense that DNA is the genetic
material.

RNA primers must be present on which strand during DNA synthesis? See Section 15.3
(Page) . - answerBoth leading and lagging strands

- The spacing between primers is different on the two strands, however.

Why does telomerase have to have a built-in template for DNA synthesis? See Section
15.4 (Page) . - answerTelomerase is involved in adding DNA to the end of the lagging
strand.

- At the ends of linear chromosomes (telomeres), telomerase uses its built-in RNA
template to extend the parent DNA template near the end of the lagging strand,
providing room for an RNA primer so that lagging strand synthesis can be completed to
the end of the chromosome (Figure 15.13).