What is the first step in seed germination?
a. emergence of the embryonic root
b. diffusion of water into the seed
c. hydrolysis of starch
d. meristem cells divide rapidly
e. cotyledons emerge from the seed
ANSWER: b
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Greenhouse gases cause an increased temperature on the Earth’s surface because they
a. absorb solar radiation. b. help bounce long-wave radiation off of the Earth’s surface. c. trap heat in the atmosphere. d. More than one of these answers is correct
Which of the following linkage maps correctly shows the order and distance between the px, sp, and cn genes?
Females heterozygous for the recessive second chromosome mutations px, sp, and cn are mated to a male homozygous for all three mutations. The offspring are as follows:
A) sp——0.21 m.u.——px——30.01 m.u.——cn
B) sp——30.01 m.u.——px——0.21 m.u.——cn
C) sp——0.2 m.u.——px——30 m.u.——cn
D) px——0.2 m.u.——sp——30.2 m.u.——cn
E) px——30.2 m.u.——sp——0.2 m.u.——cn
Humans have the least number of which class of teeth?
a. molars b. premolars c. canines d. incisors e. pre-canines
For a healthy adult, which compartment contains the most fluid?
a. extracellular b. plasma c. interstitial d. intracellular e. pericardial