Genetic variations in natural populations develop due to
A) individual activities.
B) environmental catastrophes.
C) changes in the environment.
D) random mutations of the DNA.
E) changes in diet.
D
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High production of coral reefs relative to the surrounding sea is attributed to:
a. the coral's ability to trap nutrients. b. the unique structure of the corals. c. the abundant phytoplankton surrounding the coral animals. d. the symbiotic relationship of coral animals and dinoflagellates.
What would be the result for a patient if all his spermatogonia went through meiosis and proceeded to develop into spermatids?
A. He would produce twice as many sperm and would be protected against infertility from other causes. B. He would produce twice as many sperm, which would crowd them during later development and lead to morphological defects. C. He would be entirely normal, since this is what usually happens. D. After one round of sperm production he would no longer be able to produce sperm and would be infertile.
Lipids and carbohydrates can both be used by animals to store energy.
Answer the following statement true (T) or false (F)
Transport of two different substances can be linked. If the transport is in the same direction it is called ________; if the transport is in opposite directions it is called ________.
What will be an ideal response?