To prepare a microscope slide of mitosis, where would one most likely find examples of cell division in a plant?
A. anywhere in the mesophyll of a leaf
B. in a tree trunk, near the center
C. at the center of a root, back from the tip
D. near the root tip
Answer: D
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In humans, male-pattern baldness may be assumed to be controlled by an autosomal gene that occurs in two allelic forms. Allele B determines nonbaldness, and allele b determines pattern baldness. In males, because of the presence of testosterone, allele b
is dominant over B. If a man and woman both with genotype Bb have a son, what is the chance that he will eventually be bald? A) 0% B) 25% C) 33% D) 50% E) 75%
In a Pacific kelp forest, which is a keystone species?
a. Giant kelp b. Sea otters c. Humans d. Sea urchins
A life-threatening result of taking Ecstacy can
be
a. excessive fluid volume. b. increased body temperatures. c. organ system shut-down. d. internal bleeding. e. all of these
How many years did it take for the world population to go from one billion to six billion?
a. 100,000 b. 1 million c. 200 d. 10,000 e. 1 billion