An enzyme, is produced in the stomach and breaks some of the peptide bonds in polypeptide chains. amylase denaturase dipeptidase pepsin

Name the plastid and pigment likely to be found in the cells of (a) petals of sunflower (b) ripe tomato.

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.

Which of the following describes how binary fission and mitosis are similar? a)they are both used for growth or repair b)they both break down membrane-bound nuclei c)both invoke the replication of a single stand of dna d)both replicate genetic material