How pepsinogen & trypsinogen are activated?

Nematocysts are activated by

Answer briefly: (a) Why are villi present in the intestine and not in the stomach? (b) How does pepsinogen change into its active form? (c) What are the basic layers of the wall of alimentary canal? (d) How does bile help in the digestion of fats?

Tissue plasminogen activator is

 Trypsinogen is produced by

What is an activator?

Given below are assertion and reason.Point out if both are true with reason being correct explanation,(A ) both true but reason is not correct explanation ( B),assertion true but reason is wrong (C ) both are wrong (D ). Assertion: Hcl converts pepsinogen into active enzyme pepsin Reason : Pepsin converts proteins into proteoses and peptones

The name of the pepsinogen activator is -

Name the chemical substance which converts pepsinogen to its active forms.

What are active centers ?

Active trypsin is produced frome trypsinogen by -