Be has an atomic number of 4 and an atomic mass of 9. How many protons does it have?
A. 7
B. 5
C. 9
D. 4
E. 13
Answer: D
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In experiments to show that DNA is the genetic material, Hershey and Chase labeled DNA with radioactive
A) amino acids. B) sulfur. C) phosphorus. D) carbon.
Which of the following part of your immune system is activated in response to a particular antigen or pathogen?
a. adaptive immunity b. innate immunity c. complement proteins d. mucus membranes
The significance of the Hershey and Chase
experiments in which 32P and 35S were used is that a. DNA labeled with 35S and proteins labeled with 32P can be traced in the course of an experiment. b. they demonstrated that DNA labeled with 32P is transferred from the bacteriophage to the virus. c. they established that proteins labeled with 35S become deactivated and unable to be transferred. d. they demonstrated that bacteriophages transfer their DNA, not their protein coats, into their hosts. e. DNA may be the hereditary material; although, bacteriophages transfer both DNA and proteins into their hosts.
Transcription of structural genes in an inducible operon _____
A) occurs continuously in the cell B) starts when the pathway's substrate is present C) starts when the pathway's product is present D) stops when the pathway's product is present