Which correctly describes the structure of an atom?
A. There are the same number of protons and neutrons.
B. The number of protons, neutrons, and electrons never changes.
C. There are the same number of neutrons and electrons.
D. There are never the same number of neutrons and protons.
E. There are the same number of protons and electrons.
Answer: E
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Which of the following anchors the conceptus to the uterine wall?
A. Cytotrophoblast B. Syncytiotrophoblast C. Embryoblast D. Blastomere E. Yolk sac
The reaction rates of many chemical reactions that occur in the body are controlled by special protein molecules called ________.
Fill in the blank(s) with the appropriate word(s).
When a neuron changes its ion permeability from the resting state,
A) a variety of gated ion channels may open or close, Na+ channels may open, allowing Na+ to enter the cell, and K+ channels must open, allowing K+ to enter the cell. B) a variety of gated ion channels may open or close. C) K+ channels must open, allowing K+ to enter the cell. D) Na+ channels may open, allowing Na+ to enter the cell. E) only a variety of gated ion channels may open or close and Na+ channels may open, allowing Na+ to enter the cell.
Paracortical zone is typical for:
(a) thymus (b) lymph node (c) spleen (d) bone marrow