Chemical basis of Biology

................................ normally make up more than 99% of the mass of living cells.

• inorganic and organic ions

• Hydrogen, oxygen, nitrogen, carbon, phosphorus, and sulfur

• water

• proteins

About 99% of cellular molecules are .............molecules.

• inorganic and organic ions

• carbohydrates

• water

• proteins

These are polyhydroxy derivatives of aldehydes and ketons.

• Nucleic acids

• Lipids

• Proteins

• Carbohydrates

Select the incorrect statement about aldose sugars.

• monosaccharide whose carbon skeleton has an aldehyde group   (-CHO). 

• glyceraldehyde, erythrose, ribose, glucose and galactose are aldose sugars.

• They are primarily found in animals

• They are primarily found in plants. 

Select the incorrect statement about Ketose sugars.

• monosaccharide whose carbon skeleton has ketone group (C=O).

• Fructose is a ketose sugar.

• In the presence of reducing sugar, they can be isomerize to aldoses.

• Ketose sugars can not be isomerized to aldoses.

Select the correct molecular formula for glucose sugar

• C₅H_l0O₅

• C₆H_l0O₅

• C₆H_l2O₆

• C₆H_l2O₅

Select the correct molecular formula for fructose sugar

• C₅H_l0O₅

• C₆H_l0O₅

• C₆H_lIO₆

• C₆H_l2O₅

Select the correct statement about Non-reducing sugars.

• A non-reducing sugar has a free carbonyl groups.

• These sugars do not show mutarotation.

• All diasaccharides are Non-reducing sugars.

• Most of them can act as a reducing agents.

Polysaccharides, also called glycans, which  are polymers composed of .............to....... monosaccharides.

• l00 to 1000

• l00 to 10000

• l0 to 100

• l000 to 10000

Plants store energy with ..................

• Glycogen

• Cellulose

• Starch

• Hemicellulose