What would be the result for a patient if all his spermatogonia went through meiosis and proceeded to develop into spermatids?
A. After one round of sperm production he would no longer be able to produce sperm and would be infertile.
B. He would be entirely normal, since this is what usually happens.
C. He would produce twice as many sperm and would be protected against infertility from other causes.
D. He would produce twice as many sperm, which would crowd them during later development and lead to morphological defects.
Answer: A
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Nitrification of ammonia occurs when ammonia is first converted to nitrite and then is converted to nitrate by the nitrogen-fixing bacteria.
Answer the following statement true (T) or false (F)
In humans, an extra copy of chromosome 21 typically leads to moderate to severe mental retardation and sterility, as
well as to a greater likelihood of heart defects and other problems. This disorder is known as ____.
a. Turner syndrome b. Down syndrome c. cri-du-chat d. Triple-X syndrome e. Klinefelter syndrome
A trip to space finds a planet rich with green light. Scientists hope to introduce a photosynthetic organism to this planet. What sort of organism should they choose?
What will be an ideal response?
The grouping Protista is
A. A group of exclusively microscopic organisms B. A convenient grouping of eukaryotic organisms that have some similarity but are hard to classify C. a valid evolutionary grouping that includes organisms that are more closely related to each other than to other organisms