12
Trypsinogen is an inactive enzyme of pancreatic juice. An enzyme, enterokinase, activates it. Which tissue/cells secrete this enzyme?/How is it activated?
Explanation
Trypsinogen is activated to trypsin by the enzyme enterokinase. This enzyme is secreted by the intestinal mucosa.
13
Name the enzymes involved in the breakdown of nucleotides into sugars and bases?
Explanation
The enzymes nucleotidases and nucleosidases are involved in the breakdown of nucleotides into sugars and bases.
Nucleotides $\xrightarrow{\text { Nucleotidases }}$ Nucleosides $\xrightarrow{\text { Nucleosidases }}$ Sugars + Bases
14
Define digestion in one sentence.
Explanation
The process of conversion of complex food substances to simple absorbable forms by mechanical and biochemical methods is called digestion.
15
What do we call the type of teeth attachment to jaw bones in which each tooth is embedded in a socket of jaws bones?
Explanation
The type of attachment where teeth are embedded in the socket of jaw bone is called thecodont.
16
Stomach is located in upper left portion of the abdominal cavity and has three major parts. Name these three parts.
Explanation
The three major parts of stomach are
(a) Cardiac into which the oesophagus opens.
(b) Fundus which is commonly filled with air or gases.
(c) Pylorus which opens into small intestine (posterior part of stomach).
