________ differ from one another in their number of neutrons and atomic mass
A) Electrolytes
B) Cations
C) Anions
D) Free radicals
E) Isotopes
E
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Which one of the following is not a characteristic of the endocrine system?
A) releases chemical messengers called hormones B) produces a more rapid response than the nervous system C) produces effects that last for days or longer D) produces an effect that involves several organs or tissues at the same time E) important homeostatic system
In children, it is nearly impossible to tell the sex of a skeleton
Indicate whether the statement is true or false.
The erectile tissue that extends down into the glans penis is the
A) corpus spongiosum. B) corpora cavernosa. C) preputial glands. D) smegma. E) crus of penis.
Proteins that are embedded within, and extend across, the phospholipid bilayer are called _____ proteins
A. catalytic B. integral C. cytoskeleton D. peripheral