Origin and evolution of life; classification of organisms

What are viruses?

Tiny, non-living biological infectious agents

What does a virus consist of?

Either a DNA or RNA genome encased in a protein coat known as a capsid

How can viruses reproduce?

By infecting and taking over a living host cell

Once inside a host cell, viruses can

remain dormant for a while

When stimulated into the (lytic) phase, the virus can

insert its own genetic material into that of the host

The genome of both DNA and RNA viruses can either be

single or double-stranded

Animals are eukaryotic and

multicellular

Are animals heterotopic or autotrophic?

Heterotrophic

All animals are motile, even if

only during certain stages of their life

What is the kingdom name Animalia also known as?

Metazoa

What is the subkingdom Paraoza?

Sponges and Trichoplax

Sponges and Trichoplax have differentiated cells but no distinct

tissues or body symmetry

What is the subkingdom Eumetazoa?

All other animals, with two or three distinct layers of cells with differentiated tissues and either radial or bilateral body symmetry

Does the Parazoa have body symmetry?

No, because it does not have differentiated tissue

What kingdom is algae?

Plantae

The cell walls of plants consist primarily of

Cellulose and lignin

Green plants produce most of the world’s molecular

oxygen, through photosynthesis

Plants can also serve as

foods, ornaments, medicines, and drugs

The scientific study of plants is known as

Botany