Which of the following statements about the types and subtypes of the influenza (flu) virus is FALSE?
A. Flu subtype is determined by the kinds of proteins representing the H and N protein spikes making up the capsid of the virus.
B. The A(H2N2) and the A(H3N2) strains of the virus require different vaccines.
C. Of the three major types of flu virus (A, B, and C), only Type A can occur in humans, other mammals, and birds.
D. High mutation rates create more diversity in strains of flu than does genetic recombination.
E. Genetic recombination between influenza and other types of viruses is common.
Answer: E
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Which of the following human activities could contribute to the eutrophication of a lake? Check all that apply.
_____ dumping piles of leaves near a lake _____ planting trees around the periphery of the lake _____ washing clothes with soap in the lake _____ feeding the ducks in the lake _____ dumping plastic trash into the lake _____ fertilizing lawns near the lake 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 eutrophication? 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?
As climate change continues, the prevalence of vector-borne disease has increased. Why is this?
A. Diseases are more contagious in warmer weather, so as climates have warmed, vector-borne diseases spread faster. B. The bacteria and viruses that cause disease multiply more rapidly in warmer weather, so as climates have warmed, the pathogens that cause disease are more prevalent. C. As climates have warmed and winters have become less severe, the range of mosquitos and ticks has increased, bringing with them the diseases they carry. D. As climates have changed, habitats have changed. Organisms that carry disease have been displaced from their original habitats and have found new habitats, bringing the spread of disease with them.
ADH is released into the blood by the
A) liver. B) pituitary gland. C) kidney. D) small intestine.
Which of the following is generally NOT considered an ethical issue regarding recombinant DNA technology?
A) the modification of crop plants B) screening of humans for genes that predispose them to disease C) unforeseen impact on the environment D) the modification of animals to produce pharmaceuticals for humans E) answering basic research questions