Severe neural tube defects in the embryo can
be mostly avoided if the mother takes vitamin
a. D.
b. Bs.
c. C.
d. E.
e. K.
B
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In certain plants, tall is dominant to short. If a heterozygous plant is crossed with a homozygous tall plant, what is the probability that the offspring will be short?
A) 1 B) 1/2 C) 1/4 D) 1/6 E) 0
Scientists began to question the perfection of the
Chain of Being because of a. the discovery of new organisms in new parts of the world. b. the presence of body parts with no apparent function in some organisms. c. the existence of fossil forms. d. similarities in the structures found in different forms of life. e. all of these.
One of the most significant steps in the evolution of true cells from macromolecular assemblages was the evolution of:
a. electronegativity. b. covalent bonding. c. hydrogen bonding. d. valence electrons. e. molecular reproduction
All atoms of an element have the same number of ________
A) protons plus neutrons B) protons C) electrons D) neutrons