Bio: Lesson Three Chp 8.1

Multiple Choice

Which scientist was the first to observe living microorganisms using a microscope?

• Robert Hooke

• Anton van Leeuwenhoek

• Matthias Schleiden

• Theodor Schwann

Multiple Select

Which statements are part of the cell theory?

• All living things are made up of cells.

• Cells are the basic units of structure and function in living things.

• New cells are produced from existing cells.

• Cells can only be seen with an electron microscope.

Open Ended

Explain why microscopes are essential tools for cell biologists.

Fill in the Blanks

All cells, at some point in their lives, contain

, the molecule that carries biological information.

Multiple Choice

Which of the following statements best describes the main difference between prokaryotic and eukaryotic cells?

• Prokaryotic cells have a nucleus, eukaryotic cells do not.

• Eukaryotic cells have a nucleus, prokaryotic cells do not.

• Both prokaryotic and eukaryotic cells have nuclei.

• Neither prokaryotic nor eukaryotic cells have nuclei.

Multiple Choice

How did the appearance of cyanobacteria nearly 3 billion years ago impact Earth's environment?

• They caused mass extinction of other organisms.

• They released oxygen, changing the atmosphere and enabling plant and animal life.

• They made the environment more acidic.

• They decreased the amount of sunlight reaching Earth.

Open Ended

Compare the main structural differences between prokaryotic and eukaryotic cells as described in the slides.