Monozygotic twins:a
occur when two eggs are ovulated.
b. may be of different sexes.
c. have different sets of genes.
d. are called identical twins.
e. result from the fertilization of two sperm cells.
D
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Sodium has one valence electron in its third energy level. To reach a stable energy configuration, sodium will tend
to____.
a. take up an electron from another atom b. move its valence electron to the second energy shell c. give up an electron to another atom d. share its valence electron with another atom e. move an electron from the second energy level to the valence shell
The chromatids detach from one another during
a. anaphase. b. metaphase. c. interphase. d. prophase. e. telophase.
Studies suggest that to become malignant, neoplasms must establish
a. contact inhibition. b. a blood supply. c. a nutrient source. d. a second genetic mutation. e. a mutation
The first plants evolved from an organism similar to today's
A. ferns. B. fungi. C. brown algae. D. green algae.