Chronic stress:a
is associated with elevated levels of glucocorticoids.
b. may lead to the excessive stimulation of neurons.
c. increases blood flow to the brain, especially the hippocampus.
d. results in lower levels of epinephrine and norepinephrine.
e. promotes the linear growth of the skeleton
a
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32P-end-labeled DNA fragment contains the AP-1–binding site sequence
The DNA was mixed with Fos, FosC (a fragment of Fos), or Jun (all of which would form a homodimer), or with a mixture of Fos and Jun or a mixture of FosC and Jun (both of which would form the two types of homodimer and the heterodimer). Reactions were analyzed by polyacrylamide gel electrophoresis, thenautoradiography. The results are shown in Figure 1. This technique is called: A. DNA footprinting. B. electrophoretic mobility shift assay. C. reporter gene assay. D. immunoprecipitation.
The direction of expansion for a plant cell is determined primarily by ____
a. location of the cell plate b. the direction of cell division c. the direction to the nearest meristem d. orientation of cellulose microfibrils e. gravity
Two brothers share ________ percent of their genes.
A) 10 B) 25 C) 50 D) 100
Which of the following would occur in a time of severe dehydration?
a. decreased water reabsorption b. increased urine production c. elevated ADH levels d. decreased aldosterone levels e. decreased renin production