Adifference between bacteria and archaea is

a. whether they have a nucleus.
b. the makeup of their cell walls.
c. size.
d. whether they have a cell wall.

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