The spermatid is cell number

a. 2.
b. 3.
c. 4.
d. 5.
e. 6.


B

Biology & Microbiology

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Human stem cells are valuable in drug development because they can be used to

A) create experimental organisms, such as rats and mice. B) replace experimental animals such as rats and mice. C) grow human embryos in culture, on which drugs can be tested. D) study the latest stages of the disease that would have unfolded if the person hadn't died.

Biology & Microbiology

The skulls of infant chimpanzees and infant humans are remarkably similar in shape. As they mature

they become quite different due to

a. allometric growth b. paedomorphosis c. gradualism d. preadaptation e. heterochrony

Biology & Microbiology

Correns found that the inheritance of variegated color on the leaves of certain plants was determined only by the maternal parent. What phenomenon explains this pattern?

A) ribosome structure B) chloroplast inheritance C) genomic imprinting D) sex-linkage

Biology & Microbiology

Certain bacteria are capable of transforming atmospheric nitrogen into a form other organisms can use through a process known as

A. nitrogen reduction. B. nitrogen fixation. C. combustion. D. nitrogen oxidation.

Biology & Microbiology