In humans, the stem cells from which all blood cells arise are found in the

A. peripheral circulation.
B. lymphatic vessels.
C. lymph nodes.
D. bone marrow.


D

Biology & Microbiology

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If goats are crossed with sheep, embryos will form but cease development and spontaneously abort. This is an example of

A. a prezygotic mechanism. B. hybrid inviability. C. hybrid sterility. D. hybrid breakdown. E. spermatic behavior.

Biology & Microbiology

Atmospheric pressure

What will be an ideal response?

Biology & Microbiology

Nucleic acids, proteins, and complex carbohydrates are all produced by

A) hydrolytic reactions. B) dehydration synthesis. C) exchange reactions. D) hydrogen bonding. E) catabolic reactions.

Biology & Microbiology

The majority of prokaryotes are capable of forming endospores

Indicate whether the statement is true or false

Biology & Microbiology