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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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.
Biology & Microbiology
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
Biology & Microbiology
Humans have ________ different types of autosomes.
A. 22 B. 44 C. 11 D. 23 E. 46
Biology & Microbiology
Coliforms survive in natural waters but will not multiply there.
A) True B) False
Biology & Microbiology