The ability of TC cells to initiate apoptosis in virally-infected cells and cancer cells is dependent on their ability to produce ________ and ________; proteins that punch holes in the target cell membrane.
A. antibodies; interferons
B. interleukin-1; interleukin-2
C. interferon; interleukins
D. perforin; granzyme
Answer: D
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The human coccyx bone and muscles that move the human ear are ____
a. homologous structures b. comparative structures c. analogous structures
d. repetitive structures e. vestigial structures
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.
Flatworms ________.
a) are segmented worms like earthworms and leeches b) have radical symmetry c) are the simplest animals with organs and organ systems d) have an exoskeleton and paired jointed appendages
Excessive consumption of calcium, and high calcium levels in the blood will likely cause ____________.
a. raising levels of aldosterone b. lowering levels of parathyroid hormone c. lowering secretion of vasopressin d. decreasing atrial natriuretic hormone