Populations evolve for many reasons. suppose there is a population of plants that have either purple flowers or white flowers, and the allele for purple flowers is dominant. this means that plants with two purple alleles have purple flowers. plants with one purple allele and one white allele also have purple flowers. only plants with two white alleles have white flowers. for each event or condition described below, answer the following questions. which mechanism of evolution is at work? how does this event affect the population’s gene pool? do the frequencies of the two alleles change, and if so, how?

Describe the function of the endomembrane system? what organelles are involved?

What is the significance of the protein-lined pits? a. protein attracts other proteins needed for atp synthesis within the cell. b. protein-lined pits are able to transport one molecule at a time down the concentration gradient within the cell. c. the polarity of proteins allows other polar molecules to attach and be transported in the cell by transport channels. d. receptors within the pits allow ligands to fuse and be transported into the cell by endocytosis.

Which of the following statements is correct in hour our immune system responds to a potential pathogen? a. the adapted immune system will call on the innate immune system to destroy the pathogen. b. b cells will start reading the antigen code immediately and call t cells to assist in destroying the pathogen. c. the skin will be the first line of defense, and then the many phagocytes in the bloodstream will attempt to consume the possible pathogen. d. the t-cells in the adapted immune systems are the first to recognize the pathogen vaccines are weakened forms of disease causing microorganisms, which are given to patients to prevent disease. after the vaccine is administered, the immune system responds by creating a(n) to recognize the a. antigen, antibody b. antibody, antigen c. antibody, antibiotic d. antibiotic, antibody