Biosynthesis of many molecules in cells, and many modifications of macromolecules like proteins, rna, and dna require addition of single carbons. what is/are the major carrier/s of single carbons in cells?

a) s-adenosylmethionine
b) acetyl coa
c) tetrahydrofolate
d) a and b
e) a and c

The correct answer is option e) "a and c".

Explanation:

Single carbons are atoms needed for the biosynthesis of many molecules in cells, therefore the cells need a pathway to move group of atoms containing single carbons to make them available for the biosynthesis. S-adenosylmethionine and Tetrahydrofolate are two of the major carriers of single carbons in cells. S-adenosylmethionine (SAM) acts as a methyl (-CH3) donor and Tetrahydrofolate (THF) as a cofactor in enzymatic reactions.

you can get banned on this website if you post your quizzes here. . . .

the potatoes have high sugar concentrations and although these potatoes were different we could seethe effects that their sugar concentrations had in different environments. for example, the potatoes in sample a, were placed in pure water. this created a hypertonic environment and caused the potatoes to draw in water from its surroundings. we saw the opposite happen with the potatoes in sample b when placed in the sodium chloride solution. the potatoes in this case were in a hypotonic solution and therefore lost water to their surroundings.