Which of the following best describes a process that helps a cell maintain homeostasis without requiring energy to be used? 1.Channel proteins provide a passage for molecules to cross the membrane via facilitated diffusion.
2.Membrane carrier proteins help substances enter the cell against a concentration gradient.
3.Pieces of the cell membrane for vesicles circulate around extracellular materials during endocytosis.
4.Protons are pumped out of the cell to create a voltage across the cell membrane.

. fibrinogen is soluble in water and is found in high concentrations in the blood, where it waits until needed to form a clot

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.