A cell that is permeable to Solute X is placed into solution containing a higher concentration of X. Diffusion occurs until equilibrium is attained. At this time, A) there is no further movement of Solute X across the membrane. B) there is no further change in concentration of Solute X. C) Both of the statements are correct. D) Neither of the statements is correct.

B) There is no further change in concentration of Solute X

Explanation:

During diffusion for attaining equilibrium it is necessary that;

There is no further change in concentration of particular Solute. Becuase if we change the concentration of solute on either side of membrane it will establish the concentration gradient and solute will start moving from higher concentration to lower concentration.

Remember at equilibrium the movement of molecules across the membrane does not stop. Equilibrium just equalizes the movement of molecules on both side of membrane. SO, there would be no further net movement of molecules.

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.