For most animal embryos, what is the name of the initial opening between the developing gut and the outside environment?

a. mesoglea
b. blastopore
c. schizocoelom
d. archenteron


Ans: b. blastopore

Biology & Microbiology

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Humans have ________ different types of autosomes.

A. 22 B. 44 C. 11 D. 23 E. 46

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Cell extension involves

A. loss of water. B. low acidic condition. C. enzymes that produce polysaccharides. D. expansion of cellulose microfibrils. E. water leaving the central vacuole.

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What is the main force by which most of the water within xylem vessels moves toward the top of a tree?

A) active transport of ions into the stele B) evaporation of water through stoma C) the force of root pressure D) osmosis in the root

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Coliforms survive in natural waters but will not multiply there.

A) True B) False

Biology & Microbiology