Which of the following can result in irregularities leading to cancer?           a. the body using cyclins to regulate the timing of the cell cycle   b. the body utilizing growth factors in development   c. the body programming its cells to die   d. the body failing to respond to signals that slow the cell cycle

The organelle pictured is found in cells of and is theorized to have once been an independent organism.

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.

What enzyme is most important for dna replication and why?