Biology Quiz Lessons 12 & 13

The active agent used to detect the starch molecule in a solution is

• Potassium iodide

• Sodium iodide

• Calcium iodide

• Copper iodide

The glucose subunits in “Amylose” is connected via________ and have ________

• α (1-4) glycosidic linkage/long-unbranched chain

• β (1-4) glycosidic linkage/short-branched chain

• α (1-6) glycosidic linkage/long-unbranched chainβ (1-6) glycosidic linkage/short-branched chain

• β (1-6) glycosidic linkage/short-branched chain

The positive iodine test gives

• Brick-red

• Brown-yellow

• Dark-brown

• Blue-black

Lipids are hydrophobic and show higher solubility in

• Acidic medium

• Basic medium

• Non-polar organic solvent

• Weakly polar organic solvent

The alkaline nature of Benedict’s test is due to the presence of

• Sodium bicarbonate

• Copper sulfate

• Sodium carbonate

• Sodium hydroxide

The Benedict’s test is best to check the concentration of

• Non-reducing sugars

• Reducing sugars

• Amino acids

• Complex carbohydrates

The purple color appears when protein molecules react with copper sulfate in an alkaline medium specified by:

• Emulsion test

• Starch test

• Biurets test

• Benedict test

The disaccharide that gives negative Benedict’s test is

• Lactose

• Sucrose

• Maltose

• Fructose

The DCPIP-redox agent gives pink color when reduced into

• DCPIP

• DCPIPH

• DCPIPH2

• DCPIPH4

During Biuret’s test, copper sulfate interacts with______ group of proteins.

• COO-

• -NH2 -

• –CH3-

• -H-