In response to a stimulus such as pain, a neuron sends a signal to the brain using

a. contraction and relaxation

b. electrical signals and chemical neurotransmitters

c. respiration and absorption

d. myosin and actin

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.

When explaining dominant and recessive traits to a younger family member, they respond, "well chances are i can probably taste ptc, since dominant traits are more common." how might you address this misconception?

Nucleic acids offer variability because they contain alternate forms of genes called .