What molecule is needed for photosynthesis to occur?

glucose

oxygen

nitrogen

carbon dioxide

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?

Which statement best describes the relationship between an allele and a gene? question 1 a. an allele is a variation of a gene that can be expressed as a phenotype. b. an allele is the part of a gene that attaches to messenger rna molecules. c. an allele is a segment of a dna molecule that controls replication of a gene.

Nerve cells are specialized to respond to stimulitrue or false?