What chemical bond is responsible for the existence of the sugar-phosphate backbone of DNA? covalent bond
hydrogen bond
metallic bond
ionic bond

During endocytosis, cells expel what they don't need take in what they need shrink due to loss of water

How would you expect the mrna codons that code for the amino acids that make up hemoglobin to compare between humans

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