The main hypothesis about the origin of the first living organisms is called ________.

• chemo-evolution

• novel design

• biogenesis

• panspermia

What does the term biogenesis mean?

• Formation of life from preexisting cells

• Formation of life from nonliving chemicals

• Formation of chemicals from organic monomers

• Formation of self-replicating molecules

How old is our planet Earth?

• 4.6 thousand years old

• 4.6 million years old

• 3.5 billion years old

• 4.6 billion years old

Tags

NGSS.HS-ESS1-6

What are the main steps of biogenesis, in the correct order?

• Polymers, monomers, self-replicating molecules, first cells

• Self-replicating molecules, monomers, polymers, first cells

• Monomers, self-replicating molecules, polymers, first cells

• Monomers, Polymers, self-replicating molecules, first cells

What do scientists believe was the original genetic material able to copy itself without assistance?

• DNA

• RNA

• Proteins

• Carbohydrates

By what means do prokaryotes typically divide?

• Binary fission

• Mitosis

• Meiosis

• Regeneration

Which protective structure forms to protect certain bacteria during periods of harsh conditions?

• Flagella

• Biofilm

• Endospore

• Capsule

If you look at unknown cells under a microscope, what could lead you to correctly conclude that they are prokaryotic cells?

• They appear to have a cell wall.

• They lack a nucleus.

• They are oblong in shape.

• They form a colony.

Bacteria that have a spherical shape are called (a)   .

• coccus

• bacillus

• spirillum

• spheroid

Prokaryotic organisms are present in how many domains?

• One

• Two

• Three

• Four