The tracheal system of insects __________.
cb. is stiffened with chitinous rings and leads into the lungs
c. is filled by positive pressure breathing
d. ramifies along capillaries of the circulatory system for gas exchange
e. provides an extensive, fluid-filled system of tubes for gas exchange
Answer: a. is highly branched and approaches almost every cell to effect gas exchange
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As a scientist working for an anti-bioterrorism task force, you are asked to evaluate some biological samples for the presence of Yersinia pestis, the organism that causes the plague. After confirming that the samples do contain Y. pestis, you instruct your team to begin sequencing the strain. Since the genome sequence of Y. pestis is already known, why would sequencing this strain be useful?
A. To provide better data for the genome database B. To establish the course of infection, and determine whether the strain is altered by causing infection C. To help determine the source of the strain, and learn whether it has been genetically engineered D. To create a vaccine for this particular strain 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 genome analysis? Consider Possibilities · Consider the different answer options. Which can you rule out? 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?
When someone has cataracts, they may be able to have a surgical replacement of their cloudy lens with an artificial lens. The artificial lens implant will be clear, but it is also fixed in shape. Based on your knowledge of vision, would it usually be necessary to get a new prescription for their glasses following this surgery?
A. Yes, the artificial lens will be fixed, so it cannot give distance vision one moment and near vision the next. B. No, they would no longer need glasses after lens replacement surgery because a new lens would not need correction.
Which of the following contribute to the environmental resistance of bacterial endospores?
A. Presence of calcium dipicolinate B. Spore coat C. Low water content of endospore D. Lower pH E. All of the choices are correct.
Ever since the antibiotic drug penicillin was discovered in 1928, the incidence of resistant bacteria has steadily increased as a direct result of
(a). biodiversity. (b). natural selection. (c). homeostasis. (d). development. (e). reproduction.