Chapter 4

Question 1

The first eukaryotic cells appeared

Answer 1

2 – 3 billion years ago

Question 2

Bacteria, archaea, and eukarya all evolved from the

Answer 2

last common ancestor.

Question 3

First primitive eukaryotes were likely

Answer 3

single-celled and independent.

Question 4

Over time cells _____, forming_____

Answer 4

aggregated, colonies

Question 5

Cells within colonies became ______

Answer 5

specialized to perform a specific function.

Question 6

Complex multicellular organisms evolved as individual cells

Answer 6

lost the ability to survive separately from the intact colony.

Question 7

Which EUKARYOTIC organism is always unicellular?

Answer 7

Protozoa

Question 8

Which EUKARYOTIC organism may be unicellular or multicellular?

Answer 8

Fungi
Algae

Question 9

Which EUKARYOTIC organism is always multicellular?

Answer 9

Helminths (have unicellular egg or larval forms)