Exam 16: The Molecular Basis of Inheritance

After mixing a heat-killed, phosphorescent strain of bacteria with a living nonphosphorescent strain, you discover that some of the living cells are now phosphorescent. Which observations would provide the best evidence that the ability to fluoresce is a heritable trait?

Which of the following represents the order of increasingly higher levels of organization of chromatin?

Which of the following help(s)to hold the DNA strands apart while they are being replicated?

What is meant by the description "antiparallel" regarding the strands that make up DNA?

Grains represent radioactive material within the replicating eye. -In an experiment, DNA is allowed to replicate in an environment with all necessary enzymes, dATP, dCTP, dGTP, and radioactively labeled dTTP (³H thymidine)for several minutes and then switched to nonradioactive medium. It is then viewed by electron microscopy and autoradiography. The figure above represents the results. Which of the following is the most likely interpretation?

The hydrolysis of the pyrophosphate in DNA replication is

Which of the following investigator(s)was/were responsible for the following discovery? In DNA from any species, the amount of adenine equals the amount of thymine, and the amount of guanine equals the amount of cytosine.

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

In trying to determine whether DNA or protein is the genetic material, Hershey and Chase made use of which of the following facts?

The enzyme telomerase solves the problem of replication at the ends of linear chromosomes by which method?

Which of the following statements describes chromatin?

An Okazaki fragment has which of the following arrangements?

You briefly expose bacteria undergoing DNA replication to radioactively labelled nucleotides. When you centrifuge the DNA isolated from the bacteria, the DNA separates into two classes. One class of labelled DNA includes very large molecules (thousands or even millions of nucleotides long), and the other includes short stretches of DNA (several hundred to a few thousand nucleotides in length). These two classes of DNA probably represent

Suppose you are provided with an actively dividing culture of E. coli bacteria to which radioactive thymine has been added. What would happen if a cell replicates once in the presence of this radioactive base?

One major difference in prokaryote replication versus eukaryote replication is

In a nucleosome, the DNA is wrapped around

In his transformation experiments, what did Griffith observe?

To repair a thymine dimer by nucleotide excision repair, in which order do the necessary enzymes act?

Use the following figure to answer the questions below. -In the late 1950s, Meselson and Stahl grew bacteria in a medium containing "heavy" nitrogen (¹⁵N)and then transferred them to a medium containing ¹⁴N. Which of the results in the figure above would be expected after one round of DNA replication in the presence of ¹⁴N?

The images above are of DNA at various levels of coiling and folding. Use this image to answer the questions below. -Which image shows scaffolding?