Oncogenes ________.
A. stimulate apoptosis
B. often stimulate cyclin-dependent kinases that speed up the G1 phase
C. prevent formation of cancer cells
D. block the ability of cyclins to stimulate cell division
Answer: B
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Sarah is a type 1 diabetic who forgot to bring insulin with her today. Which of the following will be TRUE of Sarah?
A. Her muscle and adipose tissue cells will not be able to take up as much glucose from the bloodstream. B. Her liver will not breakdown glycogen. C. Her muscle cells will not be able to take up as many amino acids from the bloodstream. D. Her brain cells will not be able to take up as much glucose from the bloodstream. E. None of these will occur.
Slow fibers primarily use which of the following for energy?
A) glycogen B) carbohydrates, lipids, and proteins through the aerobic pathway C) lipids D) anaerobic metabolism E) protein
Ceroid pigments and lipofuscin accumulate with aging, impairing a cell's ability to
withstand the damaging effects of oxygen free radicals. Indicate whether the statement is true or false
Why is the PO2 of the blood leaving pulmonary capillaries 104 mm Hg, but the blood leaving the lungs to enter the left atrium is 95 mm Hg?
A. Some O2 diffuses out of the blood as it travels through the pulmonary veins. B. Some CO2 in the alveoli is mixed with oxygenated blood from alveolar circulation. C. Some O2 is incorporated into bicarbonate ion, removing it from solution and reducing PO2. D. Deoxygenated blood from bronchial circulation is mixed with blood from oxygenated alveolar circulation.