What are the two structures that ensure the reproductive success of angiosperms?
a. flowers and fruit
b. cones and leaves
c. carpels and gametes
d. radicles and cotyledons
a. flowers and fruit
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The bald eagle became an endangered species because of
a. hunting. b. pesticide use. c. droughts. d. hunting and pesticide use.
Which of the following statements best supports the claim that organisms share fundamental processes as a result of evolution?
(A) All organisms that are introduced into new environments have the capacity to fill vacant ecological roles. (B) All organisms have the ability to utilize oxygen to harness energy from the chemical breakdown of organic compounds. (C) All organisms share a genetic code organized into triplet codons, making it possible for one organism to express a gene from another organism. (D) All organisms possess structures such as chloroplasts and mitochondria within their cells that reflect past symbiotic relationships between prokaryotic precursors.
Which of the following is/are true of antibiotic usage and the development of antibiotic resistance?
A. Antibiotics select for resistant mutants and bacteria possessing R-plasmids, increasing their frequency in the population. B. Antibiotics increase the rate of bacterial transformation, conjugation, and transduction, and thus increase the spread of antibiotic resistance. C. Antibiotics cause mutations (antibiotics are mutagens), thus resulting in increasingly resistant bacterial populations. D. Antibiotics cause R-plasmids to form and cause their transfer, spreading antibiotic resistance. E. All of these choices are correct.
The overall role that a species serves in a community is its
A. population. B. niche. C. biome. D. habitat. E. community.