The respiratory zone is the only site of gas exchange within the lungs. the respiratory zone is the only site of gas exchange within the lungs. a. true b. false

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.

Round seeds and yellow seed color are dominant to wrinkled seeds and green seed color. which punnett square represents the correct way to set up the cross rryy  ´  rryy? 

Hershey and chase confirmed that dna, not protein, was the genetic material. how do the results of their two experiments support this conclusion?