Neuropeptide neurotransmitters
a. can act as a direct neurotransmitter between neurons and muscle cells.
b. can act as a postsynaptic membrane inhibitors.
c. directly open K+ channels to inhibit neurons.
d. can act as pain reducers and initiate euphoria.
e. directly inhibit euphoria.
D
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Which of the following situations will lead to natural selection?
a. The seeds of two plants land near each other and grow to similar sizes. b. Two types of fish eat the same kind of food have the same number of offspring. c. Male lions compete for the right to mate with females, with only one possible winner. d. A drought in an agricultural area leads to a loss of different types of crops and plants.
There is a standing debate among biologists involved in looking for life on other planets as to how any alien organisms should be handled. Some feel that alien organisms should not be introduced on Earth; others feel that investigating these alien organisms will provide important information. What are some of the arguments on both sides?
What will be an ideal response?
Which of the following organelles is correctly
matched with its function? a. nucleus; protein synthesis b. ER; heredity c. Golgi bodies; packaging d. mitochondria; digestion e. chloroplasts; storage of lipids
Inhabitants of oceanic islands resemble forms of the nearest mainland but show some differences. This is an example of
A. biogeography. B. convergent evolution. C. development. D. the fossil record. E. homology.