Glucose is the most commonly used energy source by human cells because
A) this is the largest macromolecule available to cells for energy production.
B) this monosaccharide yields the most energy of all macromolecules.
C) fats and proteins yield too much energy for the cells to process.
D) glucose is generally the most readily available substrate, derived from food or glycogen.
E) no other macromolecule can be broken down enzymatically by cells to release energy.
D
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The cardiac conduction system consists of
a. the sinoatrial node. b. the atrioventricular node. c. junctional fibers. d. a branching bundle of fibers. e. all of these.
Which of the following is not an advantage of uric acid excretion in terrestrial animals?
a. Uric acid can be excreted as a paste, thereby conserving water. b. Uric acid is not toxic and can be safely stored. c. Uric acid can be stored in the eggs of animals without harm to the embryos. d. Uric acid is soluble in water and can be easily excreted. e. Uric acid can be excreted along with feces in some animals.
Digestion of starches begins in the:a
mouth. b. stomach. c. duodenum. d. jejunum. e. large intestine.
What will happen in a cell if it becomes damaged by radiation or chemicals?
a. It will not pass the G2 checkpoint. b. It will not enter S from G1. c. It will not synthesize cyclin-dependent kinases. d. It will not enter G1 from mitosis.