What is a hydrogen bond? How does water create hydrogen bonds?

There are six elements that make up most of the human body. which of the following is not one of these six elements?

Monitor and apply fix up strategies

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.