The practice of screening blood, blood products, and organ transplants for HIV has virtually eliminated the risk of HIV infection from these sources.
Answer the following statement true (T) or false (F)
True
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A human cell has a mutation in the gene that encodes the enzyme that generates lactate from pyruvate, rendering that enzyme completely non-functional. Assuming that there is ample glucose present, how would this cell generate energy in the presence of oxygen?
A. Glycolysis coupled with ethanol fermentation B. Aerobic respiration C. Primarily through the break down of proteins into amino acids D. This cell would have no way to generate energy under these conditions because it cannot carry out the reactions needed for glycolysis 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 how cells use multiple fuels to generate energy? How does this relate to the inability of the cell to convert pyruvate into lactate? What other information is related to the question? Choose Answer Do you have all necessary information to determine which products would affect cellular respiration? 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?
Among air breathing animals, birds have the most effective mechanism of extracting oxygen from air
because
a. birds utilize countercurrent exchange. b. bird lungs have more surface area. c. bird lungs are the largest among vertebrates. d. the air sacs provide additional respiratory surfaces. e. birds utilize positive force exchange.
Which aspect of the cytoskeleton is involved in the cleavage furrow?
A. intermediate filaments B. spindle fibers C. centrioles D. microtubules E. actin filaments
Why do cigarette smokers cough more than most people do?
A) The tar in cigarette smoke tends to make alveoli stick closed. Coughing opens them. B) Coughing is the respiratory system's attempt to clear itself of the thick mucus that is produced in response to smoke exposure. C) Cigarette smoking partially paralyzes the lungs; coughing exchanges the resultant "dead air." D) Coughing stimulates blood flow to the lungs.