Cell receptors and antibodies are similar in that both a. are produced by nerve cells. b. are highly specific in their actions. c. slow the rates of chemical reactions. d. are involved in digestion.

We want most cells to be even in and out which is called

6. in the dna double helix, how are the two strands of dna held together? a. chemical bonds between base pairs hold the two strands of dna together. b. hydrogen bonds between the base pairs hold the two strands of dna together. c. hydrogen bonds between sugar groups and phosphate groups hold the two strands of dna together. d. chemical bonds between sugar groups and phosphate groups hold the two strands of dna together.

How does a gymnosperm prevent itself from pollinating the same tree