Unlike white blood cells, mature red blood cells lack a(n) ________

Fill in the blank(s) with correct word


nucleus

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology

Acromegaly is the result of excessive secretion of which hormone by adults?

a. melatonin b. triiodothyronine c. thyroxine d. testosterone e. growth hormone

Biology & Microbiology