James is working with the lac operon of Escherichia coli (E. coli). He places the bacteria on a plate of growth media. The lac Operon of E. coli is shown. Based on the current understanding of this operon, which hypothesis would be useful for James to test? Addition of allolactose to the bacterial growth media should increase the speed at which the bacteria metabolize the sugar lactose. Removal of the RNA polymerase molecule should increase the amount of bacterial growth on the plate. Addition of the fruit sugar, fructose, should inhibit bacterial growth. Splicing the genes of the bacteria with other organisms should increase bacterial growth rates

Which of the following occurs most often in a population when genetic variation and overproduction are present? some organisms have a lower reproductive success than others. some organisms have a higher reproductive success than others. some organisms have no reproductive success. some organisms do not have genetic variation.

Considering the yellow and green pea color phenotypes studied by gregor mendel: a. what is the biochemical function of the protein that is specified by the gene responsible for the pea color phenotype? (1 point) b. a null allele of a gene is an allele that does not specify (or encode) any of the biochemical function that the gene normally provides (in other words, either no protein at all or only non-functional protein is produced from it). of the two alleles, y and y, which is more likely to be a null allele? (1 point) c. in terms of the underlying biochemistry, why is the y allele dominant to the y allele? (2 points) d. why are peas that are yy homozygotes green? (1 point) e. the amount of protein produced from a gene is roughly proportional to the number of functional copies of the gene carried by a cell or individual. what do the phenotypes of yy homozygotes, yy heterozygotes, and yy homozygotes tell us about the amount of sgr enzyme needed to produce a yellow color? explain your reasoning. (2 points)

Cells destroy body cells infected by a virus or bacteria. killer t t memory t none of the above