Biomolecules - 1

Biomolecules

Biomolecules are chemical compounds which are building blocks of life

​Monosaccharides are further classified on the basis of number of carbon atoms and the functional group present in them

Multiple Select

Which of the following elements are found in carbohydrates?

• Carbon

• Nitrogen

• Hydrogen

• Phosphorus

• Oxygen

Multiple Select

What type of sugar is this? (Check all that apply)

• Aldose

• Ketose

• Triose

• Tetrose

• Pentose

Multiple Choice

Which reaction is needed to break down complex sugars?

• Hydration

• Dehydration

• Dehydrogenation

• Hydrolysis

Multiple Choice

The monosaccharide in the picture above is a:

• hexose

• pentose

• tetrose

• heptose

Carbohydrates may also be classified as

Reducing sugars or Non-reducing sugars

To understand this, we need to understand their chemical structures.

Multiple Choice

Identify the biomolecule

• Carbohydrate
• Lipid
• Protein
• Nucleic Acid

Multiple Choice

This biomolecule would be used for

• Building enzymes
• Storing energy
• Key source of energy
• Storing genetic information

Multiple Choice

How many C-atoms are there in a pyranose ring?

• 3

• 5

• 6

• 7

​Enantiomers, Epimers and Anomers

Multiple Choice

How many stereoisomer that aldotriose have ?

• 16

• 8

• 4

• 2

Multiple Choice

What kind of stereoisomers are D-ribose and D-xylose

• Enantiomer

• Diastereomer

• Epimer

• Isomer

Multiple Choice

Which are a pair of enantiomer

Multiple Choice

The enantiomers for D-fructose is L-glucose.

• True

• False

Multiple Choice

Identify whether this anomer is alpha (α) or beta (β)

• Alpha (α)

• Beta (β)

Multiple Choice

Glucose forms a six-membered ring in which —OH at ............. is involved in ring formation

• C-1

• C-2

• C-3

• C-4

• C-5

Multiple Choice

Anomeric carbon in D-[+]-glucopyranose is

• C-1

• C-2

• C-3

• C-5

Multiple Choice

Which anomer of D- glucopyranose is this

• alpha

• beta

Multiple Choice

The monomer of amylose is

• dextrorotatory D-glucopyranose [Alpha anomer]

• laevorotatory D-glucopyranose [Alpha anomer]

• dextrorotatory D-glucopyranose [Beta anomer]

• laevorotatory D-glucopyranose [Beta anomer]

​Hydrolysis of sucrose brings about a change in the sign of rotation, from dextro (+) to laevo (–) and the product

is named as invert sugar

​Ring opening in Maltose

Multiple Choice

Carbohydrates are classified on the basis of their behaviour on hydrolysis and also as reducing or non-reducing sugar. Sucrose is a __________ .

• monosaccharide

• reducing sugar

• non-reducing sugar

• polysaccharide

Multiple Choice

___________________is a non reducing sugar

• fructose

• lactose

• sucrose

• glucose

Multiple Choice

What reagent tests for reducing sugars?

• sugar solution

• Biuret solution

• Glucose solution

• Benedict's solution

Multiple Choice

If Benedict's solution turns yellow/green, how much reducing sugar does the food contain?

• lots of reducing sugars

• trace amounts

• none at all