Lack of which element can lead to goiter?
a. iron
b. iodine
c. calcium
d. zinc
e. magnesium
Answer: b
Biology & Microbiology
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Ciliate sexual reproduction by conjugation differs from sexual reproduction in most animals in that
A. both parents are converted into zygotes. B. the zygotic nucleus is diploid. C. cell fusion occurs during fertilization. D. meiosis occurs in both partners.
Biology & Microbiology
In contrast to ionic bonds, covalent bonds ____
a. hold atoms together b. have distinct, three-dimensional forms c. transfer electrons from one atom to another d. are rarely broken e. are transient
Biology & Microbiology
Olfactory centers are responsive to
a. touch. b. smell. c. taste. d. sound. e. sight.
Biology & Microbiology
What structure hold the DNA copies together?
A. Centrosomes B. histones C. spindle fibers D. TSG's
Biology & Microbiology