An atom or molecule with an electrical charge is a(n)
A. isomer.
B. isotope.
C. ion.
D. neurotransmitter.
E. acid.
C. ion.
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In sea urchins, the "fast block" and the longer lasting "slow block" to polyspermy, respectively, are _____
A) the acrosomal reaction and the formation of egg white B) the cortical reaction and the formation of yolk protein C) the jelly coat of the egg and the vitelline membrane D) membrane depolarization and the cortical reaction E) inactivation of the sperm acrosome
A temporary change in the conformation of a nitrogenous base is called ______
A. Depurination B. A tautomeric shift C. Deamination D. None of the answers are correct
How many protons does a neutral carbon atom contain?
a. 2 b. 4 c. 6 d. 8
What term is used to indicate the ability of a cancer to invade other parts of the body and to produce secondary tumors?
a. Angiogenesis b. Metastasis c. Carcinogenesis d. all of the above