Examine a fresh chicken bone and a chicken bone that has been soaked for several days in vinegar or ex- posed overnight in dilute hydrochloric acid. Wear dis posable gloves for handling these bones. This acid treat- ment removes the inorganic salts from the bone matrix. Rinse the bones in water and note the texture and flexi bility of each. Based on your observations, what quality Celularof the fresh bone seems to be due to the inorganic salts that were removed by the acid treatment?

Hershey and chase confirmed that dna, not protein, was the genetic material. how do the results of their two experiments support this conclusion?

Astudent poured a solution of bromothymol blue indicator into three test tubes. then he placed an aquatic plant in two of the test tubes, as shown below. he placed a stopper on each test tube and placed them all in the dark for 24 hours. bromothymol blue turns from blue to yellow in the presence of co2

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.