During action potential which of these statement is true? a) Na+ goes outside the cell membrane
b) there is repolarization of cell membrane
c) there is depolarization of cell membrane
d) non of above

Ascientist is studying muscle twitches in chicken quadriceps. to activate the muscle, he needs to provide stimulus to the

Aresearcher has developed two stains for use with seed plants. one stains sporophyte tissue blue; the other stains gametophyte tissue red. if the researcher exposes pollen grains to both stains, and then rinses away the excess stain, what should occur? a) the pollen grains will be pure red. b) the pollen grains will be pure blue. c) the pollen grains will have red interiors and blue exteriors. d) the pollen grains will have blue interiors and red exteriors.

How does a gymnosperm prevent itself from pollinating the same tree