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WorksheetsBiology Quiz Lessons 12 & 13
Total questions: 17
Worksheet time: 10mins
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-
DCPIP stands for:
Dichlorophenol indophenol
Dichloropyrophenol indophenol
Dichlorophosphate indophenol
Dichlorophenol iodinephenol
The brick-red color of Benedict’s test depicts higher sugar concentration.
True
False
The sodium carbonate in the biuret’s test provides an alkaline medium.
True
False
Sudan III reagent is used to detect lipid molecules in the solution.
True
False
Vitamin C is an oxidizing agent and basic in nature.
True
False
Lipid molecule forms aggregate in water.
True
False
Ashley has been given 4-unknown test tubes with Mystery solution, and her results come out like this;
Test-tube A: Benedict’s- orange-reddish
Test-tube B: Iodine- Bluish black
Test-tube C: DCPIP- Pink
Test-tube D: Biuret’s- violet/light purple
Detect which biomolecules could be present on following test-tubes;
Protein
Test tube A:
Amylose
Test tube D:
Carbohydrate
Test tube C:
Low concentration of Vitamin C
Test tube B:
