In the Hershey and Chase experiment, why was the pellet radioactive after bacteria had been infected with 32P-labelled viruses and centrifuged?
a. The bacteria had incorporated radioactive proteins into their cell membranes.
b. The virus particles had incorporated radioactive proteins from the bacterial DNA.
c. The bacteria had incorporated radioactive DNA.
d. The bacteria had incorpo
Ans: c. The bacteria had incorporated radioactive DNA.
You might also like to view...
____ will neither hurt nor help the individual's
chances of survival.
a. A beneficial mutation b. A neutral mutation c. A random mutation d. A lethal mutation e. None of these
A saprobe differs from a parasite in that
A. a saprobe derive nutrients from dead plants and animals, but a parasite derives nutrients from living plants and animals. B. a saprobe is a fungus, but a parasite can be any type of microbe. C. a saprobe does not harm a host that it lives on, whereas a parasite does harm a host. D. a saprobe cannot infect a human, but a parasite is always infectious.
In an experiment, the control group is:
a. not subjected to experimental error. b. exposed to experimental treatments. c. maintained under strict laboratory conditions. d. treated exactly the same as the experimental group, except for one variable. e. statistically the most important part of the experiment.
Movement of the chromosomes during anaphase would be most affected by a drug that prevents _____
A) nuclear envelope breakdown B) elongation of microtubules C) shortening of microtubules D) formation of a cleavage furrow