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

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology