Which of the following is not true concerning T-independent B cell activation?
A. B cell receptors are not involved in activation
B. No B memory cells are formed
C. Affinity maturation does not occur
D. All of the choices are true.
Answer: A
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The challenges in movement experienced by people with Parkinson disease are due to loss of dopamine-secreting neurons in the
A. medulla oblongata. B. cerebellum. C. thalamus. D. substantia nigra. E. somatosensory cortex.
What happens to the number of goblet cells found in the walls of the respiratory tract as it moves down from the upper conducting zone to the lower respiratory zone?
A) changes to ciliated pseudostratified epithelium B) decreases C) increases D) thickens E) no change
Blood calcium level is regulated in part by _________ a hormone secreted by the thyroid gland when the blood calcium level rises.
A) serotonin. B) parathyroid. C) calcitonin. D) estrogen.
ATP is important for chaperone protein function. Why would protein import into mitochondria be disrupted if ATP were depleted from inside mitochondria?
A.) the translocation apparatus would be unable to function without ATP hydrolysis B.) the protein could slip back out of the mitochondria during transport C.) the protein would be blocked from entering the translocation apparatus D.) the signal sequence would not be recognized on the mitochondrial protein