What is the main role of red blood cells?
A. Carry sugars
B. Carry oxygen
C. Aid blood in clotting
D. Fight off infections
Answer: B
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Chitin is a major component of the _____
A) skeleton of mammals B) hydrostatic skeletons of earthworms C) exoskeleton of insects D) body hairs of mammals E) skeleton in birds
Most mineral ions that plants need are
a. moved into the symplast via active transport. b. moved into the transmembrane pathway via bulk flow. c. moved into the apoplast via facilitated diffusion. d. moved into the symplast via facilitated diffusion. e. moved into the apoplast via bulk flow.
What structure do bacteria use during conjugation?
a. pili b. flagella c. ribosomes d. plasma membrane e. no bacterial structure; it relies on viral transfer
A characteristic that is independently acquired by reversal or convergent evolution exhibits homology
_____________________ Indicate whether the statement is true or false.