Proteins：练习题

Which of the following chemical elements is unique to the structure of a protein molecule, distinguishing it from carbohydrates and fats?

A specific food source contains all the essential amino acids in the correct proportions required by the body. How is this type of protein classified?

A vegan is planning a meal consisting of cereals and pulses. Which concept best explains why these two food groups are eaten together to ensure a supply of all essential amino acids?

Besides growth, what is the primary biological function of proteins in the human body?

What are the end products of protein digestion that are absorbed through the intestinal wall into the bloodstream?

(a) Name the four chemical elements that make up a protein molecule.
(b) State the end product formed when proteins are completely digested in the human digestive system.

Define the term High Biological Value (HBV) proteins and provide two food examples that are considered HBV sources.

Distinguish between essential amino acids and non-essential amino acids, and explain the metabolic reason why essential amino acids must be consistently supplied by the diet.

(a) State the four chemical elements that make up a protein molecule.
(b) Name the end products of protein digestion in the human digestive system.
(c) State two essential biological functions of proteins in the body.

(a) Define the term essential amino acids.
(b) Explain why a strictly plant-based (vegan) diet requires the consumption of complementary proteins.
(c) Give one specific food combination example of complementary proteins and identify the two plant protein sources involved.