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Chapter 15 HW - Mastering Biology (1
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Chapter 15 HW - Mastering Biology (1
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Chapter 15 HW - Mastering BiologyPhage
This is a T2 phage, a type of phage that infects E. coli. - CORRECT ANSWER-
Who demonstrated that DNA is the genetic material of the T2 phage? - CORRECT
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 _____. - CORRECT
ANSWER-DNA
- 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. -
CORRECT ANSWER-35S
- 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. - CORRECT
ANSWER-labeled 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) . - CORRECT ANSWER-Both 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) . - CORRECT ANSWER-Telomerase 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).
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