Exam 5: The Nature of Life on Earth

Enzymes are catalysts which means that they

How many different amino acids make up proteins found in virtually all life on Earth?

Organisms whose cells lack a nucleus are called

Abnormal forms of protein molecules called prions have one of the characteristics of living things in that they

Any change in the base sequence of an organism's DNA is referred to as a

What is the MOST important role that nucleic acids play in living organisms on Earth?

The complete set of genetic information that makes up an organism is known as a

How is RNA different from DNA?

Humans are scientifically classified as Homo sapiens. In this system, the word sapiens refers to the

Organisms which have evolved to survive under severe environmental conditions are referred to as

The first person to introduce the concept of evolution was the

Most likely, before biological evolution there was

Chemists refer to molecules containing carbon atoms as

Endospores are

In the scientific method, natural selection is classified as a

All living cells use the molecule adenosine triphosphate (ATP)

Silicon forms its strongest chemical bonds with

A mule is an example of an exception to which of the fundamental characteristics of life?

How many different nucleotide bases are used in nucleic acids in life on Earth (consider both DNA and RNA)?

The Bacteria Chloroflexus live in live in lakes, rivers, hot springs, and aquatic environments with very high salt contents. They obtain energy from the Sun and carbon from other bacteria. Given this, they can be classified metabolicaly as