One of the primary advantages of cell culture is the ability to isolate a single type of cell from a multicellular organism. how has this advance changed the study of biology?
single-type cultures are easier and cheaper to maintain than cultures made of mixed cell types.
scientists can completely avoid using animal or human test subjects during their experiments.
cultures with single cell types behave in culture exactly as they would behave in a tissue or organ.
scientists know that any resp

Dna is colied into chromosomes in a cell

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

If there is another new infectious disease somewhere in the world, what do you think canadian officials should do