Why did hershey and chase label the viral dna with radioactive phosphorous and not radioactive sulfur?
a. dna contains phosphorus and no sulfur.
b. proteins contain phosphorus and no sulfur.
c. dna contains sulfur and little phosphorus.
d. proteins contain sulfur and little phosphorus.

Plzz hurry im being timed during times of vigorous physical activity, muscles require a constant supply of oxygen. how does the body respond to these needs? a. breathing rate and heart rate both decrease. b. breathing rate and heart rate both increase. c. heart rate decreases, but breathing rate remains stable. d. breathing rate increases, but heart rate remains stable.

Awic dietitian is meeting with a client who has an infant and a young child. the mother says that the young child is a very picky eater and will only eat crackers and juice. the health worker notices that the child's hair is brittle, his nails tear easily, and the skin inside his lower eyelids is very pale. these are all signs of iron deficiency.

Identify the missing parts of the carbon cycle