Why is the citric acid cycle called a cycle? What substances enter the cycle, and what substances leave it?
What will be an ideal response?
The citric acid cycle reaction sequence is a cycle because the four-carbon starting compound (oxaloacetic acid) is regenerated at the end. Acetyl-CoA and oxaloacetic acid begin the cycle by combining to form citric acid, and then in a series of steps CO2, NADH, ATP, and FADH2 are released and oxaloacetic acid is regenerated to begin the cycle again.
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The path that fluid takes as it enters a lymphatic capillary is through
A. pores (fenestrations) in the cells of the capillary wall. B. cell membrane leakage channels that allow diffusion. C. vesicles that move the fluid across the cell (transcytosis). D. spaces between capillary endothelial cells that are arranged as one-way flaps.
What type of cell is a bacterium?
A) eukaryotic B) archaeal C) prokaryotic D) viroid
The sensitivity of the muscle spindle is maintained by ________.
A. alpha motor neurons B. gamma motor neurons C. a stretch reflex D. secondary afferent (group II) fibers E. anulospiral endings
Which of the following symptoms of diabetes mellitus is NOT correctly matched with its term?
A. Polydipsia - extreme hunger B. Ketonuria - ketones in the urine C. Glycosuria - glucose in the urine D. Polyuria - excessive urination