An organism that feeds on plant or algal tissues is referred to as a(n)
A) herbivore.
B) omnivore.
C) carnivore.
D) decomposer.
A
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Growth-factor stimulation of the Ras/Raf/ERK pathway initially stimulates the synthesis of cyclin
a. A. b. B. c. C. d. D.
Your parents are both heterozygous for the recessive disorder phenylketonuria (PKU). What is the
probability that you will have the disorder?
a. 25% regardless of the health of your 3 siblings b. 50% no matter whether or not you have siblings c. 75% no matter whether or not you have siblings d. 100% even if you are an only child e. 25% but only if your three siblings are healthy.
Which of the following statements about the cell-mediated response is false? a. Cyotoxic T cells touch-kill any body cells that display viral antigen-MHC complexes on their surfaces
b. A dendritic cell that engulfed a sick body cell displays antigen from that cell, becoming an antigen-presenting cell. c. Activated cytotoxic T cells differentiate into memory cytotoxic T cells and effector helper T cells. d. Naive helper T cells bind to antigen-MHC complexes on dendritic cells.
Each __________ develops into a pollen grain. Fill in the blank(s) with the appropriate word(s)