Which of the following is an example of qualitative observation? a. joseph is observing the color difference in the reaction mixture of each of the test samples to see what types of proteins are present in them.
b. joseph is measuring the color of the reaction mixture colorimetrically to see the concentration of proteins in the sample.
c. joseph is observing the color of the reaction mixture to see whether proteins are present in the given solution.

hey, i believe your answer would be d. sugar ribose and the base uracil. i believe this is the answer, because rna consists of sugar ribose, adenine, guanine, cytosine, and uracil.

your first option is incorrect, because that's dna. where it consists of sugar deoxyribose, adenine, guanine, cytosine and thymine.

your second option is also incorrect, this is because sugar deoxyribose is in dna, and uracil is in rna. these two do not make sense together.

your third option being incorrect, because sugar ribose is in rna, but not the base of thymine. rna consists of uracil, not thymine.

lastly your fourth option being correct! this answer is correct, because both sugar ribose, and the base uracil are in rna! ~

answer is d. sugar ribose and the base uracil.