A cytologist is examining a tissue under an electron microscope. He notices that the endoplasmic reticulum of each cell is extremely rough in appearance and he knows that the rough appearance is because of the ribosomes embedded there. He asks why there are so many ribosomes. You respond,
A. "This tissue exports lipids and is very involved with mRNA production."
B. "This tissue exports proteins to other areas of the body."
C. "This tissue exports various nucleic acids, hence the large number of ribosomes present on the endoplasmic reticulum in each of those cells."
B
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What function do estuaries play in commercial fisheries? a. They provide mating grounds
b. They provide temporary shelter for adults. c. None of these choices. d. They serve as a nursery to juveniles.
FSH and LH are secreted by the:
a. hypothalamus b. ovaries c. anterior pituitary d. testes e. uterus
Exotoxins are
A) Secretions that always target nervous tissue B) Proteins C) Antiphagocytic factors D) Only released after a cell is damaged or lysed E) Lipopolysaccharides
Nitrification of ammonia occurs when ammonia is first converted to nitrite and then is converted to nitrate by the nitrogen-fixing bacteria.
Answer the following statement true (T) or false (F)