CBSE Class 12 Chemistry Biomolecules Assignment

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Assignment for Class 12 Chemistry Unit 14 Biomolecules

Class 12 Chemistry students should refer to the following printable assignment in Pdf for Unit 14 Biomolecules in Class 12. This test paper with questions and answers for Class 12 Chemistry will be very useful for exams and help you to score good marks

Unit 14 Biomolecules Class 12 Chemistry Assignment

Level one questions

1.Name the sugar present in milk.
Ans: Lactose
 
2.How many monosaccharide units are present in it?
Ans: two monosaccharide units are present.
 
3.What are such oligosaccharides called?
Ans: Such oligosaccharides are called disaccharides
 
4. How do you explain the presence of all the six carbon atoms in glucose in a straight chain?
Ans: On prolonged heating with HI, glucose gives n-hexane.
 
5.Name the linkage connecting monosaccharide units in polysaccharides.
Ans: Glycosidic linkage.
 
6.Under what conditions glucose is converted to gluconic and saccharic acid?
Ans: Glucose is converted to gluconic acid by bromine water and to saccharic acid by conc. HNO3.
 
7.Which sugar is called invert sugar?
Ans: Sucrose.
 
8.During curdling of milk, what happens to sugar present in it?
Ans: It converts into Lactic acid.
 
9. Monosaccharide contain carbonyl group hence are classified, as aldose or ketose. The number of carbon atoms present in the monosaccharide moleculeare also considered for classification. In which class of monosaccharide willyou place fructose?
Ans: Fructose is a ketohexose.
 
10.What are constituents of Starch?
ANS: Amylose and Amylopectin
 
11.What D N A & R N A Stand for?
ANS: Deoxyribonuclic acid and Ribonuclic acid.

12.What are Zwitter ions?
ANS: A Zwitter ion is a dipolar ion formed by neutralisation of acidic and basic centers present within the molecule .

13.What is non reducing sugar? Give example.
ANS:  The groups like CHO, - C= O, which are not freely available in the molecule do not answer tollens or fehlings test are called non reducing sugar. E.g. maltose and lactose

14.Define mutarotation? Give example.
ANS:  The anomers of glucose i. e. alpha and beta are having specific rotation of + 111 0Cand
+ 19.20Crespectively. The mixtures of these two have a rotation of +52.40 C. this is called a mutarotation.

15.Amino acids are amphoteric in behavior? Explain.
ANS:  they form zwitterion(dipolar ion) and behave as neutral molecule at pH 7(isoelectric point)

Level Two Questions

1.Define native state and denaturation of protein.

What happens when:
a. Protein is cooled to zero degree C?
b. Protein is heated to 800 C
ANS: protein in the native state has definite configuration and biological activity. The higher structure of protein is affected without disturbing the primary structure is called denaturation.
a. no change
b.the coagulation of the protein takes place.
2. Which forces are responsible for stability of alpha Helix of protein? Why it is called 3.613 helix?
A: Hbonding. It has 3.6 amino acids in one single turn,and a 13 member ring is formed by H bonding.

3. What are essential amino acids? Give example and what happens when it is polymerized?
ANS:  amino acids required by the body and cannot be synthesized in our body are called essential amino acids. e.g. Lysine. When it is polymerized polypeptide chains are formed.

4. Glucose and sucrose are soluble in water but Cyclohexane and benzene are not soluble. Why?
ANS:  Glucose and sucrose form H bonding with water

5.(i) Write the sequence of base on mRNA molecule synthesized on the following strand of DNA: TATCTACCTGGA
ANS:  AUAGAUGGACCU
(ii)Name a powerful antioxidant which is a water soluble vitamin. A: Vitamin C
 
 
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CBSE Class 12 Chemistry Unit 14 Biomolecules Assignment

We hope you liked the above assignment for Unit 14 Biomolecules which has been designed as per the latest syllabus for Class 12 Chemistry released by CBSE. Students of Class 12 should download and practice the above Assignments for Class 12 Chemistry regularly. We have provided all types of questions like MCQs, short answer questions, objective questions and long answer questions in the Class 12 Chemistry practice sheet in Pdf. All questions have been designed for Chemistry by looking into the pattern of problems asked in previous year examinations. 

Assignment for Chemistry CBSE Class 12 Unit 14 Biomolecules

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Unit 14 Biomolecules Assignment Chemistry CBSE Class 12

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Unit 14 Biomolecules Assignment CBSE Class 12 Chemistry

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CBSE Chemistry Class 12 Unit 14 Biomolecules Assignment

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