Question

1.
The phosphodiester bonds in a polynucleotide
chain are hydrolysed by the secretions of
(1) Exocrine pancreas
(2) Islets of Langerhans
(3) Zymogenic cells of gastric glands
(4) Crypts of Lieberkuhn​

Answer 1

Answer:

(2) Islets of Langerhans

Hope it may be helpful

Answer 2

The "phosphodiester bonds" in a polynucleotide chain are hydrolyzed by the secretions of the exocrine pancreas.

Explanation:

The DNAase or simply nuclease is one of the enzymes which breaks down DNA by hydrolysis of phosphodiester bonds of its sugar.

The endonuclease hydrolyzes internal phosphodiester bond in the polynucleotide chain. These phospho di ester bond in is found mainly in the DNA and RNA. The "DNA and RNA" are nucleotide sequences with phosphor di ester bond.