To replicate this experiment, researchers only needed one population of bacteria, because bacterial populations contain millions of individuals.
a. true
b. false
Ans: b. false
(The unit of evolution is the population; therefore, the researchers needed multiple populations to replicate the experimental treatment.)
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Gnetophytes are of great interest to plant biologists because they have many traits more typical of angiosperms, such as:
A. living xylem cells. B. wind pollination. C. double fertilization. D. few, slow-growing leaves. E. cones.
Which one of the following statements is true?
A) Koch developed a rabies vaccine. B) Microorganisms are ubiquitous. C) Most microorganisms are harmful to humans. D) Pasteur conducted experiments that proved the theory of abiogenesis.
Drug toxicity occurs when an antimicrobial drug acts as antigen and stimulates an allergic response.
Answer the following statement true (T) or false (F)
A waxy layer secreted by the epidermal cells of a plant is the
A. stomata. B. cuticle. C. guard cell. D. xylem. E. phloem.