When insulin is secreted from the pancreas and acts on muscle cells to increase glucose uptake, this is an example of
A. autocrine signaling.
B. paracrine signaling.
C. direct intercellular signaling.
D. endocrine signaling.
E. contact-dependent signaling.
Answer: D
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Some fish have electroreceptors that detect weak electrical signals. The function of these electroreceptors is to:
A. avoid dangerous situations. B. locate prey. C. identify potential mates. D. help photosensitive species avoid excessive light.
The zone that is exposed only during spring tides is called:
a. lower intertidal. b. subtidal. c. Laminaria. d. seagrass. e. splash.
Which of the following causes DNA to wrap tightly around histones, essentially shutting down transcription?
A. Methylation B. Acetylation C. Nitrogenation D. Dehydration E. Carbonation
Hormones responsible for the fight-or-flight response are produced in the ________
Fill in the blank(s) with correct word