Unlike white blood cells, mature red blood cells lack a(n) ________
Fill in the blank(s) with correct word
nucleus
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Approximately what percentage of a cell's genes is being used at any one time?
a. 1 to 2 percent b. 5 to 10 percent c. 25 to 50 percent d. 70 to 80 percent e. 90 to 99 percent
The leopard seal's primary predator is called the:
a. sperm whale. b. polar bear. c. killer whale. d. salt water crocodile. e. Weddel seal.
Acromegaly is the result of excessive secretion of which hormone by adults?
a. melatonin b. triiodothyronine c. thyroxine d. testosterone e. growth hormone
The difference between pinocytosis and receptor-mediated endocytosis is that _____
A) pinocytosis brings only water molecules into the cell, but receptor-mediated endocytosis brings in other molecules as well. B) pinocytosis increases the surface area of the plasma membrane, whereas receptor-mediated endocytosis decreases the plasma membrane surface area. C) pinocytosis is nonselective in the molecules it brings into the cell, whereas receptor-mediated endocytosis offers more selectivity. D) pinocytosis can concentrate substances from the extracellular fluid, but receptor-mediated endocytosis cannot.