Which of the following is TRUE regarding enzymes?

A. They are proteins.
B. They are reusable.
C. They speed up chemical reactions.
D. All of the choices are correct.


Answer: D

Anatomy & Physiology

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Birds may bite but typically do not cause major injuries

Indicate whether the statement is true or false

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When blood calcium levels are low

A. ostoclast activity increases. B. calcitonin secretion increases. C. bones produce more bone tissue. D. calcium absorption is reduced. E. osteoblast activity increases.

Anatomy & Physiology

Glucose enters some cells

a. through primary active transport b. through secondary active transport c. through facilitated diffusion d. all of the above processes e. through A and C only

Anatomy & Physiology

A joint that consists of two opposing flat surfaces of approximately equal size is a/an ________ joint.

A. ellipsoid B. plane C. hinge D. saddle E. pivot

Anatomy & Physiology