Answer:
Explanation:
Rivers may be contaminated by sewage.
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Answer:
There are 4 tryptophans in the protein.
Explanation:
According to question, protein contains one tyrosine residue and say x number of tryptophans.
Concentration of protein solution = 1.0 micromolar = 
Molar absorptivity of a protein solution : 


Length of the cuvette = l = 1.0 cm
Absorbance of protein solution at 280 nm = A = 0.024
( Beer-Lambert's law)

Solving for x :
x = 4
There are 4 tryptophans in the protein.
Answer:
they are the same element because they have the same number of protons and electrons,but a different number of neutrons
Answer: The anwser is A a photon was realeased please mark brainliest
Explanation: