Protein

Proteins are large, complex molecules that play many critical roles in the body. They are made up of smaller units called amino acids, which are linked together in long chains. There are 20 different amino acids that can be combined to form a protein, and the specific sequence of amino acids determines the structure and function of each protein.

Functions of Proteins

Structural Support: Proteins provide structural support for cells, tissues, and organs. For example, collagen is a protein that gives strength and elasticity to skin, tendons, and ligaments.
Enzymes: Many proteins act as enzymes, which are catalysts for chemical reactions in the body. Enzymes help to speed up chemical processes and are involved in digestion, metabolism, and other essential functions.
Transport: Some proteins, such as hemoglobin, are responsible for transporting molecules like oxygen and nutrients throughout the body.
Immune Function: Antibodies are specialized proteins that help the immune system recognize and fight off foreign invaders like bacteria and viruses.
Hormones: Certain proteins, such as insulin, act as hormones that regulate various bodily functions.

Sources of Protein

Proteins are found in a variety of foods, including:

Meat and poultry
Fish and seafood
Eggs and dairy products
Legumes, such as beans and lentils
Nuts and seeds
Soy products, like tofu and tempeh

Study Guide

Use the following questions to guide your study of proteins:

What are proteins made of, and how are they structured?
What are the main functions of proteins in the body?
Give examples of proteins that provide structural support, act as enzymes, and have other specialized functions.
Where can you find sources of protein in a typical diet?
How does the body use protein for energy and repair?

Understanding the role of proteins in the body is essential for maintaining overall health and well-being. By studying the structure, functions, and sources of protein, you can gain a deeper appreciation for the importance of this macronutrient.

◂Science Worksheets and Study Guides Second Grade. What is science?

Vocabulary/Answer key

What is science?

The resources above cover the following skills:

LIFE SCIENCE

Ecosystems: Interactions, Energy, and Dynamics

Obtain information from literature and other media to illustrate that there are many different kinds of living things and that they exist in different places on land and in water (e.g., woodland, tundra, desert, rainforest, ocean, river).

EARTH AND SPACE SCIENCE

Earth’s Systems

Make observations from media to obtain information about Earth’s events that happen over a short period of time (e.g., tornados, volcanic explosions, earthquakes) or over a time period longer than one can observe (e.g., erosion of rocks, melting of glaciers).

Collect and evaluate data to identify water found on Earth and determine whether it is a solid or a liquid (e.g., glaciers as solid forms of water; oceans, lakes, rivers, streams as liquid forms of water).