Which two hepatitis viruses primarily use the fecal-oral route for infection?
A) hepatitis C and hepatitis D
B) hepatitis B and hepatitis D
C) hepatitis D and hepatitis E
D) hepatitis B and hepatitis C
E) hepatitis A and hepatitis E
Answer: E
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One possible reason that there are not any really large insects currently living on Earth is that
A. gas exchange across their moist skin surfaces cannot support the metabolic needs of a large body. B. they do not have as many papulae as echinoderms. C. their gills do not have as many lamellae as fish gills. D. the bulk flow of air through their tracheal tubes would be more difficult the larger the body and longer the tracheal tubes. E. their lungs never evolved to be as highly branched as a mammal's. 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 respiration in insects? 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?
Craig Venter and Claire Fraser are working to create a "minimal organism.". They are starting with Mycoplasma genitalium, a bacterium that has 517 genes. By disabling its genes one at a time, they discovered that 265–350 of them code for essential proteins. The scientists are synthesizing the essential genes and inserting them, one by one, into an engineered cell consisting only of a plasma
membrane and cytoplasm. They want to see how few genes it takes to build a new life form. What properties would such a cell have to exhibit for you to conclude that it was alive? What will be an ideal response?
Nitrogen Fixation is:
A) A process that allows visualization of cells with a microscope B) possible in all living cells C) conversion of nitrogen-containing organic molecules into nitrogen gas D) production of ammonia and other compounds from nitrogen gas E) storage of nitrogen gas within a cell vacuole
Plants have developed both cuticles and crassulacean acid metabolism (CAM) in an attempt to limit which of the following?
A. photorespiration B. excess photosynthesis C. PEP carboxylase loss D. water loss