What is that which spontaneously depolarise to trigger contraction of cardiac muscle and establishes the heart rate

What does all of the organ system in a human form

What are the types of mutations, and how does each alter the encoded protein? college level answer

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.