Which of the following is the best answer for why plants require nitrogen?
A. to make carbon nitrogen bonds
B. to make chlorophyll
C. to make amino acids and nucleotides
D. to make cell walls
E. to make membranes
C. to make amino acids and nucleotides
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Your cat has fleas! You look at the ingredients in the flea control ointment, and see that it contains methoprene, a juvenile hormone analog. What does this accomplish?
Many insecticides target insect hormones such as juvenile hormone or ecdysone to disrupt development. This is preferable to simply killing the insect with more broadly-acting toxins. A. prevents flea larvae from maturing B. kills juvenile fleas C. reinvigorates the cat's immune system, to repel the fleas D. forces juvenile fleas to mature early, disrupting development of reproductive organs 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 juvenile hormone? 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? 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?
The role of the postsynaptic neuron in neural communication is to ____
a. release neurotransmitters b. use gated calcium channels c. contain synaptic vesicles d. block the action of neurotransmitters e. receive the signal from the presynaptic cell
A cell exposed to a hypertonic environment will _____ by osmosis
a. Gain water b. lose water c. neither gain or lose water d. burst
Which of the following statements concerning viruses is true?
a. Viruses possess enzymes for protein synthesis and ATP generation. b. Viruses contain both DNA and RNA, and they undergo binary fusion. c. Viruses are usually about the same size as bacteria. d. The "host range" for a virus is determined by the presence or absence of particular components on the surface of a host cell that are required for the virus to attach.