Which of the following enzymes carries out the initial step in the digestion of milk in human adults?

1.  Rennin

2.  Lipase

3.  Trypsin

4.  Pepsin

Match the following structures with their respective location in organs:

Select the correct option from the following:
 

Identify the cells whose secretion protects the lining of gastro-intestinal tract from various enzymes:

1. Duodenal cells

2. Chief cells

3. Goblet cells

4. Oxyntic cells

Fructose is absorbed into the blood through mucosa cells of intestine by the process called:

1. Active transport

2. Facilitated transport

3. Simple diffusion 

4. Co-transport mechanism

Which of the following options best represents the enzyme composition of pancreatic juice?

1. Amylase, pepsin, trypsinogen, maltase

2. Peptidase, amylase, pepsin, rennin

3. Lipase, amylase, trypsinogen, pro carboxypeptidase

4. Amylase, peptidase, trypsinogen, rennin

Which cells of "Crypts of Lieberkühn" secrete antibacterial lysozyme?

1. Paneth cells

2. Zymogen cells

3. Kupffer cells

4. Argentaffin cells

In the given diagram of the transverse section of the gut, the longitudinal muscles are represented by the letter:

          1. A               

          2. B

          3. C               

          4. D