Which of the following is a key feature of chordates?

a. having a notochord in the embryonic stage
b. possessing many rows of tube feet
c. having thin arms that lack organs
d. engaging in intracellular digestion


a. having a notochord in the embryonic stage

Biology & Microbiology

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In the kidney, the specialized transport proteins that allow for very rapid fluid movement into or out of cells are known as

A) aquaporins. B) porins. C) ionophores. D) anion exchange proteins. E) osmosins.

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Traditional evolutionary systematics used the Linnaean system of classification

a. True b. False

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The tough, two-layered sac of connective tissue that holds the heart is called the ________

a. ventricle b. atrium c. myocardium d. pericardium

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In club fungi, each club-shaped cell initially

a. is a spore. b. is a zygote. c. contains a single nucleus. d. is dikaryotic. e. undergoes mitosis to produce spores

Biology & Microbiology