Question

1. A membrane bilayer has two sides, side A and side B. If there are 100 glucose molecules on side A and 46 on side B, the free energy of moving glucose from side B to side A is:

A. positive

B. negative

C. zero, because glucose is uncharged

D. It depends on the temperature, which is not given.

2. Which of the following statements about lipids is not true:

A. Lipids are mostly made of carbon and hydrogen atoms.

B. Sphingolipids must contain nitrogen.

C. Lipids are generally water-soluble.

D. Triacylglycerols have three fatty acid chains.

3. Binding of an agonist to an adrenergic GPCR receptor results in:

A. The G alpha S subunit dissociating fromt he Gbeta-Ggamma subunits.

B. The Gbeta subunit dissociating from the GalphaS-Ggamma subunits.

C. The Ggamma-subunit dissociating from the GalphaS-Gbeta subunits.

D. None of the above is correct.

E. All of the above are correct.

4. The name of the protein that makes alpha 1 --> 6 connections between glucose monomers in glycogen is?

A. Glycogen Phosphorylase

B. Glycogen Branching Enzyme

C. Glycogen debranching enzyme

D. Glycogen synthase

Answer 1

Answer 1 A Positive

Movement of glucose from side B to A is against concentration gradient .....so it will be actively move...

hance it require energy to move so free energy chenge will be positive.

Ans 2 .C.Lipids are generally water in soluble.

Ans 3 A is correct

The alpha-1 adrenergic receptor is a G protein-coupled receptor associated with the Gq heterotrimeric G-protein.

Ans 4 Glycogen branching

Glycogen is found in animals, and it is branched like amylopectin. It is formed by mostly alpha 1,4 glycosidic linkages but branching occurs more frequently than in amylopectin as alpha 1,6 glycosidic linkages occur about every ten units. Other polysaccharides have structural functions.