If each nucleotide coded for a single amino acid, how many different types of amino acids could be combined to form proteins?
a. 4
b. 16
c. 20
d. 64
e. none of these
a
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How did Meselson and Stahl distinguish between semiconservative and dispersive replication in their experiment?
A. After one round of replication, only mixed DNA molecules were present in native gradients. B. After two rounds of replication, only mixed DNA molecules were present in the gradient. C. After two rounds of replication, both heavy and light DNA molecules were present in the gradient. D. After one round of replication, both heavy and light DNA single-strands were present in alkaline gradients. E. After two rounds of replication, only heavy DNA strands were present in alkaline gradients.
During a viticulturist's presentation on growing and managing grapes, why did he state that it is imperative to encourage the grapevine's natural tendency for positive thigmotropism?
A. To encourage the vine's response to move toward the early morning light as opposed to the late afternoon sun. B. To encourage the roots to grow deeper and spread out. C. To encourage the grapes to retain their sugar for a longer period of time. D. To encourage the twining stems to wrap around the supporting wires. E. To discourage early ripening of the fruit. 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 plant growth and thigmotropism? 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?
Which portion of the brain is not protected by the blood-brain barrier?
a. pons b. cerebellum c. thalamus d. cerebrum e. hypothalamus
All zygotes are
a. multicellular. b. diploid. c. animals. d. clones. e. gametes.