Question

Aminoacyl-tRNA synthetase like DNA polymerase has proofreading capability? T/F?

The major amino acid that is released from muscle and converted to glucose in the liver is; Alanine?

A glycosidic bond is best described as a bond formed via which one of the following?

	A.	Through multiple hydrogen bonds between two sugar molecules
	B.	Between the anomeric carbon of a sugar and an O-H (or N) of another molecule
	C.	Between two anomeric carbons in polysaccharides
	D.	Internal bond formation between the anomeric carbon of a monosaccharide and its own fifth carbon hydroxyl group

Answer 1

solution

(1).-false

Aminoacyl-tRNA synthetases (aaRS) play a central role in protein biosynthesis by catalyzing the attachment of a given amino acid to the 3' end of its cognate tRNA.

(2). Muscle breaks down glycogen and proteins and releases lactate and alanine. Alanine, lactate, and glycerol are delivered to the liver and used as precursors to synthesize glucose (gluconeogenesis).

(3).(B). Between anomeric carbon of sugar and O-H (or N) of another molecules.

Glycosidic bonds are the covalent chemical bonds that link one sugar molecules to other molecules. They form by a condensation reaction between alcohol or amine of one molecule and the anomeric carbon of the sugar and, therefore, may be O-linked or N-linked