The highly pathogenic bacterium clostridium perfringens causes gangrene, a disease that results in the destruction of animal tissue. the bacterium secretes two types of collagenases that cleave the peptide bonds linking gly and pro residues. a biochemical company sells a partially purified preparation of these collagenases to investigators who are interested in culturing cells deived from bone, cartilate, muscle, or endothelial tissue. how does this enzyme preparation assist the investigator in obtaining cells for culturing?
an enzyme found in tadpoles cleaves the peptide bond indicated in the figure below. what protein might contain this sequence and what is the role of this cleavage in the metamorphosis of the tadpole to the adult frog?
gly-pro-gln-ile-ala

What evidence could be used to convince policy makers to change a shipping lane from going through a whale breeding ground? information on the number of all whale species currently alive information on the number of all whales hit by boats in the given area information on the number of whale deaths in the world's oceans information on the number of whale offspring born every year. (a) scientists could collect and combine data on fish populations all around the world to show that their populations are declining. (b) scientists collect and combine data on fish populations all around the world to show that their populations are increasing. (c) scientists work together and use past data to show that fish populations are becoming locally extinct in some areas. (d) scientists work together and use past data to show that some fish populations are adapting to environmental changes.