Question

1) what chemically breaks proteins down into large polypeptides?

pepsinogen

protease

bile

pepsin

2) which of the following is involved in converting pepsinogen to pepsin?

hydrocholric acid

renin

pancreatic protease

salvary amylase

A and B

A,B and C

3) what does amylase do to maltose?

emulsifies it into sugars

mixes it with proteases

converts it into starch

hydrolyzes it into glucose

4) what is expected to happen when amylase is temperatures of 60 or above?

will decrease

be the same

will increase

will not change

5) what is the primary source for the bulk of the lipase used in the gastrointestinal tract?

liver

pancreas

stomach gallblader

6) what are building blocks of lipids?

sugars and starches

triglycerides and nucleotides

nucleotides and amino aicds

fatty acids and monoglycerides

Answer 1

1. Protein is one of the macronutrients present in human food. Digestion of protein takes place in stomach duodenum. Protein is broken down into polypeptides through the action of enzyme pepsin secreted by the cell lining of stomach.
So the answer is pepsin

2. Pepsinogen is secreted by the chief cells of stomach. After the hydrochloric acid present in gastric juices reacts with pepsinogen it is converted to pepsin which helps in protein digestion.
So the answef is hydrochloric acid

3. Amylase is an enzyme secreted by salivsry glands and pancreas.
Amylase acts on starch and breaks it down into simple sugars. When amylase acts with maltose, it hydrolyses it to glucose.
So the answer is : hydrolyses it to glucose

4. Amylase is a digestive enzyme that works best at an optimal temperature of 32-37oC. The temperature above and below this range destroys the enzymatic activity.
At a temperature of 60 and above, the enzyme will get denatured.
So the amylase activity will decrease.
5. Lipases breaks down the fat pressmt in food into simpler molecules.
Lipases in the human body are secreted by liver, pancreas, endothelium. But the dietary lipase used in digestion comes mainly from pancreas. So the answer is pancreas

6. Lipids are biomolecules that stores energy. When there is excess carbohydrates in the body it is coverted to fatty acids and glycerides.  These fatty acids and glycerides molecules combine to form lipids. So the answer is fatty acids and monoglycerides