Pick out the incorrect statement(s) from the following
1. Glucose exists in two different crystalline forms, $ \, \, \, \alpha$-D-glucose and $\beta$-D-glucose
2. $\alpha$-D-glucose and $\beta$-D-glucose are anomers
3. $\alpha$-D-glucose and $\beta$-D-glucose are enantiomers
4. Cellulose is a straight chain polysaccharide made of $ \, \, \, $only $\beta$-D-glucose units
5. Starch is a mixture of amylose and amylopectin, both $ \, \, \, $contain unbranched chain of $\alpha$-D-glucose units
$\alpha$-D-glucose and $\beta$-D-glucose differ in the orientation of .Hand OH-groups around first carbon atom. Such isomers are called anomers not enantiomers. Starch is a mixture of amylose and amylopectin but amylose is a straight chain polymer of $\alpha$-D-glucose while amylopectin is a branched chain polymer of $\alpha$-D-glucose.
Biomolecules are the most essential organic molecules, which are involved in the maintenance and metabolic processes of living organisms. These non-living molecules are the actual foot-soldiers of the battle of sustenance of life.
There are four major classes of Biomolecules – Carbohydrates, Proteins, Nucleic acids and Lipids.
Carbohydrates are chemically defined as polyhydroxy aldehydes or ketones or compounds which produce them on hydrolysis.
Proteins are another class of indispensable biomolecules, which make up around 50per cent of the cellular dry weight. Proteins are polymers of amino acids arranged in the form of polypeptide chains. The structure of proteins is classified as primary, secondary, tertiary and quaternary in some cases.
Nucleic acids refer to the genetic material found in the cell that carries all the hereditary information from parents to progeny. There are two types of nucleic acids namely, deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). The main function of nucleic acid is the transfer of genetic information and synthesis of proteins by processes known as translation and transcription.
Lipids are organic substances that are insoluble in water, soluble in organic solvents, are related to fatty acids and are utilized by the living cell.
