Before DNA, ____ likely served as the genetic material
a. RNA
b. protein
c. carbohydrate
d. lipid
e. free nucleotides
a
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Which one of the following would be found in the cells of a blade of grass but not in the cells of an insect feeding on that grass? Select all correct choices
What will be an ideal response?
What occurs as a result in a drop in the level of a hormone?
A zoo is hand-rearing an endangered species of songbird. What is the best approach to help prepare the males to attract mates?
A. Expose the males to a mentor male bird singing their species' song during the critical period. B. Expose the males to female pheromones from their species, to initiate development of song circuits during the critical period. C. Expose the males to each other during the critical period, to initiate development of song circuits during the critical period. D. Expose the males to a variety of birdsongs during the critical period. Clarify question: What is the key concept addressed by the question? What type of thinking is required? Gather Content: What do you already know about mating behaviors in male birds? What other information is related to the question? Choose Answer: Given what you now know, what information is most likely to produce the correct answer? Reflection 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?
A single, quick contraction of skeletal muscle is called a:
a. simple twitch. b. tetanus. c. brief contraction. d. red fiber contraction. e. white fiber contraction.