Biochemistry Exam Part 2_Proteins and Lipids

What is the main role of phospholipids in living cells?

• Cell membrane formation

• Cell signaling

• Enzyme activation

• Energy storage

What is the process used to separate proteins from a mixture of other substances where in protein precipitates out from a saturated solution of salt unchanged?

• Salting in

• Salting out

• Salting up

• Salting down

The breakdown of lipids involves

• Breaking of a bond using oxygen via hydrolysis

• Addition of a bond using water

• Breaking of a bond using water via hydrolysis

• Addition of a bond using oxygen

The α carbon of an amino acid is

• The carbon attached to the acid group

• The carbon in the middle of the acid group

• The carbon farthest from the acid group

• The carbon closest to the acid group

The molecule that has both hydrophilic and hydrophobic parts said to be

• Ampiphilic

• Hydrophonic

• Hydrodynamic

• Hydrostatic

What is the main component of the basic backbone of most fat or oil molecules?

• Glucose

• Glycerol

• Fructose

• Sucrose

What is the process best described by the formation of lipids?

• Hydrolysis

• Dehydration synthesis

• Oxidation

• Reduction

Enzymes are proteins, the main role of which in living cells is

• Cell signaling

• Energy storage

• Cell membrane formation

• hasten reaction rate

What is the main component of the first cells likely developed from spontaneous associations of phospholipids?

• Vesicles

• Liposomes

• Proteosomes

• Micelles

Proteins are about ___ % N.

• 84

• 16

• 25

• 75