Select the true statement. a. rna is mostly single-stranded; dna is always double-stranded. b. rna and dna usually have identical intravenous bases. c. several types of dna regulate protein synthesis.

Study the diagram of a cell. which structure is found only in plant cells and functions in the process of photosynthesis? w x y z

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.

Give two examples of what would occur if one of the pairs did not match or had an extra chromosomes. explain how this might occur, and if it would be dangerous to the individual. fast.