Nitrogen is
A. an important constituent of carbohydrates.
B. primarily fixed by fungi.
C. turned into ammonia by microorganisms.
D. ultimately used in making amino acids and nucleotides.
E. turned into ammonia by microorganisms AND ultimately used in making amino acids and nucleotides.
E. turned into ammonia by microorganisms AND ultimately used in making amino acids and nucleotides.
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Two parents who do not have sickle cell anemia have a child that has the disease. The parents are both:
A. homozygous for the sickle cell allele. B. heterozygous for the sickle cell allele. C. homozygous for the normal allele. D. epistatic for the sickle cell allele. E. pleiotropic for the sickle cell allele. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about sickle cell anemia? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Although most of the mechanisms of evolution are nonrandom, the one that is absolutely random is ________
A) sexual selection B) natural selection C) artificial selection D) genetic drift
Heirloom plants are treasured for their flavorful produce and true-breeding progeny that allow gardeners to avoid repeatedly purchasing seed from agribusiness conglomerates. What special effort is required to save seed from heirloom biennials such as carrots?
A. Biennials do not produce seed until the second year of growth. Although carrot roots are normally harvested after one season, they must be allowed to grow another year for seed collection. B. Since carrots are related to wild weeds, they are often cross-pollinated. The green top must be bagged to ensure self-pollination. C. Since carrots build up so much beta-carotene, they do not devote many resources to seed development. A yellow carrot variety will produce better seeds than a darker one. D. Since carrots produce large roots, they do not devote many resources to seed development. The roots must be trimmed before collecting seed.
Which of the following additives help preserve food as well as enhancing flavor?
A) cinnamon B) garlic C) salt D) salt and pepper E) cinnamon, garlic, and salt