In a famous experiment, matthew meselson and franklin stahl grew e. coli cells in a medium containing only the "heavy" isotope of nitrogen, n15n15 . these cells were then transferred to a medium with the "light" isotope of nitrogen, n14n14 . the results of the experiment supported the hypothesis of semiconservative replication, which was proposed by watson and crick. heavy dna ( n15n15 dna), hybrid dna, and light dna ( n14n14 dna) can be separated by centrifugation. if cells containing n15n15 dna are transferred to a medium with only n14n14 nh4clnh4cl as a nitrogen source, what percent of daughter molecules are composed of hybrid dna after 44 generations?

If you answer this i"ll give you brainiest and all these points me if you do i love you 7. a doctor is at work taking care of sick patients. she spends a few minutes trying to figure out why a particular patient is sick. she taps the patient's knee to test his reflexes. while she is examining him, the patient coughs on her. a) describe the function of the skeletomuscular system in this situation. (3 points) b) describe the function of the circulatory and respiratory systems in this situation. (3 points) c) describe the function of the immune system in this situation. (3 points) d) describe the function of the nervous system in this situation. (3 points) e) describe one way that any two of the doctor's body systems worked together in this situation. (3 points)

What evidence supports the law of conservation of energy? a) mechanical energy is converted to chemical energy during photosynthesis. b) oxygen is made from the breakdown of carbon dioxide during photosynthesis. c)energy is absorbed by chlorophyll and becomes chemical energy during photosynthesis. d)the sun gives off light energy that is absorbed by plants.

What is the approximate time of death of the body temperature is 29.4 degrees celsius