Origin of Life and Early Earth topic 1

Front

How old is the Earth?

Back

~4.6 billion years old

Front

When did the first life forms appear?

Back

~3.8 billion years ago

Front

What does abiotic synthesis mean?

Back

Formation of organic molecules from inorganic compounds

Front

Name the four main steps in the origin of life.

Back

1. Abiotic synthesis of small organic molecules 2. Formation of macromolecules 3. Packaging into protocells 4. Origin of self-replicating molecules

Front

What is the “RNA World” hypothesis?

Back

RNA was the first genetic material before DNA and proteins

Front

Why was RNA likely the first genetic molecule?

Back

It can store information and catalyze reactions

Front

What are ribozymes?

Back

RNA molecules that act as enzymes

Front

Why did life likely originate in the ocean?

Back

Protection from UV radiation and extreme heat

Front

What is a protocell?

Back

A membrane-bound droplet containing organic molecules

Front

Why is DNA considered better than RNA as genetic material?

Back

It is double-stranded and more stable