Bio 110 Chap 4

According to cell theory, what are all living organisms composed of?

• Atoms

• Organelles

• Cells

• Molecules

What is the smallest unit of life?

• The atom

• The molecule

• The organelle

• The cell

How do new cells originate?

• Through spontaneous generation

• From pre-existing cells by cell division

• By merging of atoms

• From non-living matter

What type of illumination does a light microscope use?

• A beam of electrons

• Ultraviolet light

• Visible light

• X-rays

What is the resolution of an electron microscope?

• 0.2 micrometer

• 2 micrometer

• 2 nanometer

• 20 nanometer

How much better in terms of resolution is an electron microscope compared to a light microscope?

• 10 times better

• 50 times better

• 100 times better

• 200 times better

What is the typical diameter range for most bacteria?

• 1-10 nanometer

• 1-10 micrometer

• 10-100 micrometer

• 10-100 nanometer

What is the typical diameter range for a eukaryotic cell?

• 1-10 micrometer

• 10-100 nanometer

• 10-100 micrometer

• 100-1000 micrometer

What does resolution refer to in microscopy?

• The ratio between the size of an image produced by a microscope and its actual size

• The ability to observe two adjacent objects as distinct from one another

• The enhancement of an image using special dyes

• How different one structure looks from another

How can contrast be enhanced in microscopy?

• By increasing the magnification

• By using a higher resolution lens

• By using special dyes to reveal cellular structure

• By changing the light source from electron to light