Which of the following is incorrect for glucose?

When glucose is treated with excess of phenylhydrazine in acetic acid, the product is 

Which of the following disaccharide gives a ketose and an aldose only on hydrolysis?

The helical structure of protein is stabilized by 

Which sugar is present in DNA ?

Dinucleotide is obtained by joining two nucleotides together by phosphodiester linkage. Between which carbon atoms of pentose sugars of nucleotides are these linkages present ?

Which of the following bases is not present in DNA ?

In fibrous proteins polypeptide chains are held together by ............ .

Which of the following hexoses will form the same osazone when treated with excess phenylhydrazine ?

The beta and alpha glucose have different specific rotations. When either is dissolved in water, their rotation changes until the same fixed value result. This is called

What is the structural feature characterising reducing sugar?

Glucose on reaction with HI gives n-hexane. What does it suggest about the structure of glucose?

Hormone secretion in mammals is under the control of ........... .

What are polysaccharides ? Give one example.

Write the zwitterion structure of glycine.

Name the enzyme which is used to dissolve the blood clot.

Name the three nucleic acids used in protein synthesis.

Which of the following base pairs are found in DNA and which of them in RNA ?
(i) A : A, (ii) A : T, (iii) C : G, (iv) G : C, (v) G : A, (vi) A : U, (vii) G : U  and (viii) A : C

Which component of starch is branched polymer of a glucose and insoluble in water?

What type of linkage holds together the monomer of DNA ?

Monosaccharides contain carbonyl group hence are classified as aldose or ketose, The number of carbon atoms present in the monosaccharide molecule are also considered for classification. In which class of monosaccharide will you place fructose?

Some enzymes are named after the reaction where they are used. What name is given to the class of enzymes which catalyse the oxidation of one substrate with simultaneous reduction of another substrate.

Sucrose is dextrorotatory but the mixture obtained after hydrolysis is laevorotatory. Explain.

Which monosaccharide units are present in starch, cellulose and glycogen and which linkages link these units?

How do enzymes help a substrate to be attacked by the reagent effectively?

Is a diet coinsisting mainly of rice an adequate diet ? why or why not ?

Protein found in a biological system with a unique three-dimensional structure and biological activity is called a native protein. When a protein in its native form is subjected to a physical change in temperature or a chemical change like, change in pH, denaturation of protein takes place. Explain the cause.

Coagulation of egg white on boiling is an example of denaturation of protein. Explain it in terms of structural changes.

(a)What is the structural difference between a nucleoside and a nucleotide?
(b)The two strands in DNA are not identical but are complementry. Explain

Define the following, giving one example of each:
(i) Zwitter ion
(ii) Glycosidic linkage

Write the chemical reaction equations for the glucose with
(i) acetic anhydride
(ii) NH₂OH Also draw Fischer projections of D-glucose and L-glucose.

(a) What is denaturation and renaturation of proteins?
(b) Give reason:Amylase present in the saliva becomes inactive in the stomach

How do expimers differ from anomers ?

Which of the following will reduce Tollens ' reagent ? Explain.

Carbohydrates form a group of naturally occuring organic compounds and are a major source of energy for our body. Some common examples are of cane sugar, glucose etc. Chemically these are either polyhydric aldehydes or polyhydric ketones and are classified as monosaccharides, oligosaccharides and polysaccharides.
(i) Name the carbohydrates which has maximum sweetners.
(ii) Which carbohydrate is present in milk?
(iii) Why is sucrose a non-reducing sugar ?
(iv) How do carbohydrates (starch in particular) act as a source of energy for our body?