Suppose that you performed a version of the Hershey and Chase experiment, this time using 32P-labeled viruses that
insert their double stranded DNA into the DNA of the cells that they infect. The viral DNA is then treated as part of the
cell's own DNA and is replicated during DNA replication and passed onto daughter cells when the cell divides. You infect
a population of cells with the 32P-labeled viruses, and then let the infected cells go through two generations of cell
divisions. If you then examine the cells, you should find 32P-labeled DNA in ____ of the cells.
a. none
b. about 1/4
c. about 1/2
d. about 3/4
e. all
ANSWER: c
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A. chickens B. cattle C. turkeys D. All of the choices are correct.
Variations in rates of growth for different parts of the body are referred to as:
a. allometric growth patterns. b. adaptive growth patterns. c. allopatric growth patterns. d. allopolyploidy. e. preadaptations
Which of the following changes in life history of the North Atlantic cod could have alerted scientists to the impending population crash?
A. A type I growth curve B. A shift to K-selection characterized by larger fish C. A shift to r-selection characterized by smaller fish D. Type I growth curve the first year and type II in years two and three E. Type I the first year, type II the second year, and type III the third year
The cephalic flexure indicates the ____ while the cervical flexure indicates the ____.
A. Forebrain-Midbrain Junction; Hindbrain-Spinal Cord Junction B. Forebrain-Midbrain Junction; Midbrain-Hindbrain Junction C. Hindbrain-Spinal Cord Junction; Forebrain-Midbrain Junction D. Midbrain Region; Hindbrain-Spinal Cord Junction E. Midbrain-Hindbrain Junction; Hindbrain-Spinal Cord Junction