Nonnative plant invaders, such as the alfalfa plant bug, are extremely invasive and hard to control because
A. they arrive in new locations where natural predators are not present.
B. their populations evolve faster than the plants they attack.
C. they tap into the xylem of a plant while seeking carbohydrates.
D. cause the plants' stomates to become unevenly distributed within the epidermis.
E. they cause the plants' axillary buds to grow out.
Answer: A
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Differences between the amino acid sequence of human cytochrome c and that of 5 other species are given in the choices below. Based on these data, humans are most closely related to
A) bullfrogs: 20 amino acid differences. B) pigeons: 12 amino acid differences. C) fruit flies: 24 amino acid differences. D) yeast: 42 amino acid differences.
The increasing concentration of fat-soluble toxins at successive trophic levels is known as ________.
a. trophic cascade b. biomagnification c. energy flow d. gross primary productivity
Tears, milk, sweat, and oil are secreted by glands made of what tissue?
a. epithelial b. loose connective c. lymphoid d. nervous e. adipose
An inhibitory post-synaptic impulse (IPSP):
a. brings a neuron to a more positive voltage. b. brings the neuron further away from firing. c. occurs when Cl- ion channels close. d. occurs when Na+ ion channels open. e. occurs when K+ ion channels close.