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
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Birds may bite but typically do not cause major injuries
Indicate whether the statement is true or false
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
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
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.