cell

The order of these structures from smallest to largest is cells, tissues, organs, organ systems.

The smallest unit of organization is the cell. The next largest unit is tissue; then organs, then the organ system. Finally the organism, is the largest unit of organization. The smallest unit of organization is the cell.

Answer: The correct order of the levels of organization from smallest to largest is molecule, cell, tissue, organ, organ system, organism, population, community, ecosystem, biosphere.

Organelles are the substructures (such as mitochondria and chloroplasts) inside cells that perform particular functions. They are therefore smaller than cells. They are therefore larger than cells. Organisms are made up of organs which are made up of tissues, and are therefore larger than tissues.

Mycoplasma genitalium, a parasitic bacterium which lives in the primate bladder, waste disposal organs, genital, and respiratory tracts, is thought to be the smallest known organism capable of independent growth and reproduction. With a size of approximately 200 to 300 nm, M.

In general, the shapes of viruses are classified into four groups: filamentous, isometric (or icosahedral), enveloped, and head and tail.

The term “germs” refers to the microscopic bacteria, viruses, fungi, and protozoa that can cause disease. Washing hands well and often is the best way to prevent germs from leading to infections and sickness.

What Do Germs Do? Once germs invade our bodies, they snuggle in for a long stay. They gobble up nutrients and energy, and can produce toxins (say: TOK-sinz), which are proteins that act like poisons.

But what do we mean when we say “bugs”? The term is used to describe viruses, bacteria and parasites. While they can all make us sick, they do it in different ways.

Parasites are part of a large group of organisms called eukaryotes. Parasites are different from bacteria or viruses because their cells share many features with human cells including a defined nucleus. Parasites are usually larger than bacteria, although some environmentally resistant forms are nearly as small.

A Virus is a piece of malicious software/code that at its core has no other purpose but to reproduce/copy itself to other computers. A bug is an error that is found on a legitimate piece of software which prevents it from working as it should.

Most viruses have either RNA or DNA as their genetic material. The nucleic acid may be single- or double-stranded. The entire infectious virus particle, called a virion, consists of the nucleic acid and an outer shell of protein. The simplest viruses contain only enough RNA or DNA to encode four proteins.

Antibodies, Antigens and Antibiotics Antibodies are proteins that recognise and bind parts of viruses to neutralise them. Antibodies are produced by our white blood cells and are a major part of the body’s response to combatting a viral infection.