Which of the following is not true of bacteria?
a. bacteria change nitrogen into a form plants can use.
b. bacteria change oxygen into nitrogen.
c. bacteria change the sugar in milk to lactic acid.
d. bacteria change harmful chemicals into harmless ones.

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.