(i)Why does DNA replication occur in small replication forks and not in its entire length?
(ii)Why is DNA replication countinuous and discountinuous in a replication fork?
(iii)Explain the importance of 'origin of replication' in a replication fork.

3

(a)

(a) Name the type of synthesis 
(b) Occurrence in the types of synthesis and as shown below: 

3

(a)

How many histones make the core part of a nucleosome.What is the basis of binding DNA molecule to the histones?

3

(a)

Write the principle involved in the separation of DNA fragments by gel electrophoresis

3

(a)

Here some correct and some wrong statements.Correct only those statements which are wrong:
(a) The genetic code is universal 
(b)The genetic code is ambiguous
(c)The genetic code is regenerated.
(d)Transfer RNA(tRNA)carry amino acids to mRNA codons and used again and again in transcription.
(e)UAA, UAG and UGC are terminator codon
(f)Lac operon consists of regulatory genes, operator gene,structural and promoter gene

3

(a)

(a)Name a genetic RNA and a non-genetic RNA
(b)Differntiate between prokaryotic mRNA and eukaryotic mRNA on the basis of any one character.

3

(a)

What do you understand by 5'-end and 3'-end?

3

(a)

Do you think that the alternate splicing of exons may enable a structural gene to code for several isoproteins from one and the same gene ?If yes.how?If not, why so?

3

(a)

Cattle or even human beings, sometimes give to their young ones having extremely different sets of organs like limbs/position of eye(s) etc.Comment with respect of genetics involved in it.

3

(a)

Why is the strand of DNA with 3'-5' polarity transcribed and not the other strand with 5'--> 3' polarity?

3

(a)