Sebum contains ________ which contributes to creating an inhospitable environment on the surface of the body
A) lysozyme
B) collagens
C) acids
D) salts
E) bile
C
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Bioluminescence, as seen in squids, is possible because:
A. specialized cellular organelles of squids carry out a chemical reaction that results in light production. B. symbiotic bacteria housed in specialized organs of the squid are capable of generating light. C. squids produce a fluorescent product during cellular respiration. D. squids produce a mucous layer that reflects light energy.
Which of the following cells is NOT haploid?
a. secondary spermatocyte b. sperm c. primary oocyte d. spermatids e. polar bodies
A product of the anterior pituitary gland that causes color changes in its target cells is _____
A) follicle-stimulating hormone (FSH) B) luteinizing hormone (LH) C) thyroid-stimulating hormone (TSH) D) melanocyte-stimulating hormone (MSH)
Tree rings occur when _____
a. there are droughts during the time the rings form b. environmental conditions influence xylem cell size c. heartwood alternates with sapwood