What is Bacteria?

Bacteria are microscopic organisms that can be found almost everywhere on earth. They are single-celled organisms and can be either beneficial or harmful to humans, plants, and animals. Bacteria are one of the oldest life forms and play an important role in the environment. Some bacteria can help break down organic matter, while others are essential for human health, such as those that help in digestion.

What is a Virus?

A virus is a tiny microorganism that can only reproduce inside the cells of other living organisms. Viruses are not considered living things because they do not have the ability to create energy or grow on their own. They require the help of other living organisms in order to reproduce and spread. Viruses can cause serious illnesses, such as the common cold, influenza, and measles.

Chapter 19 Bacteria and Viruses Worksheet Answers

1. What do bacteria do?

Bacteria can do many things, including breaking down organic matter, aiding in digestion, and helping the body fight off disease. Some bacteria can also produce toxins that can be harmful to humans, plants, and animals.

2. How do viruses replicate?

Viruses replicate by entering a host cell and using its genetic material to replicate itself. The virus then uses this new genetic material to create new viruses, which then spread to other cells and organisms.

3. What is the difference between bacteria and viruses?

The main difference between bacteria and viruses is that bacteria are considered living things, while viruses are not. Bacteria can reproduce on their own, while viruses must use the genetic material of other living things to replicate. Additionally, bacteria can be beneficial to humans, while viruses are often harmful.