The number of sperm cells in an ejaculation averages

A) 2,000 to 6,000.
B) 20,000 to 60,000.
C) 200 to 600 million.
D) 200 to 600 billion.


C) 200 to 600 million.

Biology & Microbiology

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In vertebrates, which of the following endocrine organs serves as the first intermediary between the brain (which perceives sensory stimuli) and the rest of the endocrine system?

A. the hypothalamus B. the thyroid gland C. the anterior pituitary gland D. the posterior pituitary gland E. the adrenal glands

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A regression analysis predicts how much one variable will change in response to a change in a second variable

Indicate whether the statement is true or false

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When macrophages bind antigens, they secrete ____ to attract more phagocytic cells

a. more antigens b. MHC c. cytokines d. antibodies e. complement

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Eukaryotic chromosomes contain _______ DNA molecules.

a. single linear b. single circular c. multiple linear d. multiple circular

Biology & Microbiology