Waxes

Waxes are a diverse class of organic compounds that are hydrophobic, meaning they repel water. They are long-chain fatty acids that have been esterified with long-chain alcohols. Waxes serve a variety of functions in living organisms and in man-made products.

Structure of Waxes

Waxes are typically composed of a long-chain fatty acid and a long-chain alcohol. The fatty acid component is usually a saturated or unsaturated straight-chain carboxylic acid, while the alcohol component is a long-chain linear or branched alcohol. The ester linkage between the fatty acid and the alcohol forms the main structure of the wax.

Functions of Waxes

Waxes serve several important functions:

Water Repellency: Waxes form a protective barrier on the surface of plants and animals, preventing water from penetrating and causing damage.
Protection: In plants, waxes protect the leaves from excess transpiration and reduce water loss.
Thermal Insulation: Waxes in the form of cuticles on plant leaves help protect against extreme temperatures.
Energy Storage: Some animals store energy in the form of wax esters, which can be broken down for energy when needed.
Manufacturing: Waxes are used in the production of candles, polishes, and coatings for paper, wood, and metal.

Biological Importance of Waxes

In living organisms, waxes play a vital role in protecting against dehydration, providing a barrier against pathogens, and aiding in the storage of metabolic energy.

Study Guide

When studying the topic of waxes, consider the following key points:

Understand the chemical structure of waxes, including the components and the ester linkage.
Learn about the various functions of waxes in living organisms and in commercial products.
Explore the role of waxes in protecting against water loss, thermal insulation, and energy storage.
Consider the biological importance of waxes in plants and animals, including their protective and storage functions.

By understanding the structure and functions of waxes, you can appreciate their significance in both biological systems and industrial applications.

◂Biology Worksheets and Study Guides High School. Evolution and classification

Worksheet/Answer key

Evolution and classification

Worksheet/Answer key

Evolution and classification

Worksheet/Answer key

Evolution and classification

The resources above cover the following skills:

LIFE SCIENCE (NGSS)

Biological Evolution: Unity and Diversity

Students who demonstrate understanding can:

Construct an explanation based on evidence that the process of evolution primarily results from four factors: (1) the potential for a species to increase in number, (2) the heritable genetic variation of individuals in a species due to mutation and sexual reproduction, (3) competition for limited resources, and (4) the proliferation of those organisms that are better able to survive and reproduce in the environment.

Apply concepts of statistics and probability to support explanations that organisms with an advantageous heritable trait tend to increase in proportion to organisms lacking this trait.

Construct an explanation based on evidence for how natural selection leads to adaptation of populations.