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.

What does it mean for a cell membrane to be selectively permable

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.

Based on the topographic map of mt. st. helens, what is the contour interval of the volcano about height is 2,950 m?