A cell with a defective p53 gene is likely to
A) stop responding to growth regulators.
B) stop dividing to produce daughter cells.
C) generate hormones that combat tumors.
D) produce cells without a defective p53 gene.
Ans: A) stop responding to growth regulators.
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Catabolic pathways _____
A) combine molecules into more energy-rich molecules B) supply energy, primarily in the form of ATP, for the cell's work C) are endergonic D) are spontaneous and do not need enzyme catalysis E) build up complex molecules such as protein from simpler compounds
Aerobic respiration involves the transfer of many electrons from glucose to electron carriers such as NAD+ over a series of multiple steps. Ultimately though, it is the reaction of glucose with oxygen to generate carbon dioxide, water and energy. Why doesn't glucose react directly with oxygen in cells?
A. Oxygen cannot accept electrons, and thus an electron carrier like NAD+ is needed. B. Oxygen and glucose are localized in different subcellular compartments. C. The direct reaction of oxygen with glucose would be extremely destructive to cells. D. The reaction of oxygen with glucose is not spontaneous.
________ is often referred to as the "stress" hormone since it initiates and maintains seed and bud dormancy.
A. Gibberellins B. Abscisic acid C. Cytokinins D. Ethylene
Which of these is part of the defense against parasites, such as tapeworms and hookworms, that have invaded the body?
A) monocytes B) lymphocytes C) neutrophils D) eosinophils