Test: JEE Previous Year Questions- Biomolecules - JEE MCQ

The answer are option D
The functional group which is found in amino acid is
Amino acids are organic compounds that contain amine (–NH2) and carboxyl (–COOH) functional groups, along with a side chain (R group) specific to each amino acid.

RNA nucleotides contain ribose sugars while DNA contains deoxyribose and RNA uses predominantly uracil instead of thymine present in DNA.

The correct answer is Option A.
 
Cellulose is a straight chain polysaccharide composed of D-glucose units which are joined by β-glycosidic linkages.
Hence, cellulose on hydrolysis produces only D-glucose units.
 

The correct answer is option D
The two polynucleotide chains or strands of DNA are linked up by hydrogen bonding between the nitrogenous base molecules of their nucleotide monomers.
 Adenine-Thymine (two hydrogen bonds) and Cytosine-Guanine (three hydrogen bonds).
 

Chlorophylls are green pigments in plants and contain magnesium.
They are useful during photosynthesis to store energy in the form of glucose from carbon dioxide and water in presence of sunlight.

Uracil is present in RNA and binds to adenine whereas thymine is present in DNA and binds to adenine.

The correct answer is Option B
A hormone is a class of signaling molecules produced by glands in multicellular organisms that are transported by the circulatory system to target distant organs to regulate physiology and behaviour. Insulin is a hormone which is responsible for the level of sugar in blood and hence maintaining the level of diabetes.

The correct answer is Option D.
 
Enzymes are specific biological catalysts that possess well defined active sites. Enzymes are specific biological catalysts that can normally function at body temperatures (T - 310K).
Enzymes are normally biological catalysts that are very specific in their action.
Enzymes are specific biological catalysts that can be poisoned by using enzyme inhibitors.

Pyrimidine is an aromatic heterocyclic organic compound similar to pyridine. In nucleic acids, three types of nucleobases are pyrimidine derivatives: cytosine (C), thymine (T), and uracil (U).

The correct answer is option C
Anomers of glucose are cyclic diastereomers (epimers) differing in configuration at C-l, existing in two forms α and β respectively.

The correct answer is option A
 
Secondary structure of proteins involves 
α − helical backbone and β − sheet structures. These structures are formed as a result of H-bonding between different peptide groups.

The correct answer is Option B.
α-D-glucose and  β-D-glucose is example of anomers  
 
An Anomer of a saccharide only differs in its structure at the anomeric carbon. Anomeric carbon being the functional group of the carbohydrate, which is usually the carboxyl group attached to it.
 
Epimeres differ at only one chiral center, not the anomeric carbon.

 Carbohydrate is a polyhydroxy aldehyde or polyhydroxy ketone or any compound which give these on hydrolysis.  group includes aldehydic as well as ketonic group.

Glycine is the only amino acid with no asymmetric (chiral) carbon because it has two hydrogens attached to alpha carbon.

Biuret test is given my an amide linkage. We know that it is present in urea, polypeptides and proteins (polypeptides themselves). Carbohydrates do not have any amide linkages.

The correct answer is option B
RNA has a hydroxyl group on the second carbon which is not present in DNA.
Thus, hydroxyl groups on a second carbon atom of the sugar differentiate between RNA and DNA.

The simplest member of this group is glycine, where the saturated carbon atom is unsubstituted, rendering it optically inactive. The rest of the 20 most common amino acids are optically active existing as both D and L stereoisomer.

The correct answer is Option B.

On the basis of mode of polymerization, polymers are two types:- Addition and condensation polymers.
Condensation polymers are formed through a condensation reaction, where molecules join together and lose small molecules as by-products such as water or methanol.
An addition polymer is a polymer that forms by simple linking of monomers without the co-generation of other products.
So, monomers are converted to polymer by condensation reaction between monomers.
 

The correct answer is option A
Nylon-66 is a polyamide.
Terylene is a polymer formed by polymerization of ethyl alcohol and terpthalic acid and is a polyester. Nylon 6, 6 is a polymer formed by polymerization of hexamethylene diamine and adipic acid and is a polyamide. Teflon is a polymer formed by polymerization of tetra flouro ethylene.

The correct answer is option A
Teflon is a polymer of CF2=CF2.

Bakelite is obtained from phenol by reacting with formaldehyde HCHO. It is step growth branched thermosetting co-polymer of phenol and formaldehyde.

The correct answer is option C
Buna - N is a copolymer of acrylonitrile (H₂​C= CH– CN ) and  buta-1,3-diene(H_2​C= CH – CH=CH₂​).

The correct answer is option B
Lewis acid can start the cationic polymerization and AlCl₃ is a lewis acid which can be used to generate cations.

The correct answer is option B
The chemical reaction that takes place during photosynthesis is given below:
6CO₂​+6H₂​O→C₆​H₁₂​O₂​+6O2​+18ATP+12NADPH
Thus, synthesis of each molecule of glucose involves 18 molecules of ATP