Chapter 4: Microscopes in A Tour of the Cell

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Questions and Answers

Which cellular structure is responsible for forming a flexible boundary between the cell and its surroundings?

  • Ribosomes
  • Plasma membrane (correct)
  • Endoplasmic reticulum
  • Mitochondria

What is the main function of the plasma membrane in a cell?

  • Regulating the flow of materials in and out of the cell (correct)
  • Cell division
  • Energy production
  • Waste removal

What is the role of some proteins embedded in the plasma membrane?

  • Synthesizing DNA
  • Shielding ions and polar molecules as they pass through channels (correct)
  • Forming a rigid boundary
  • Storing excess nutrients

How does the surface area to volume ratio of cells affect the exchange of materials?

<p>Higher ratio facilitates better exchange (D)</p> Signup and view all the answers

What distinguishes eukaryotic cells from prokaryotic cells?

<p>Presence of membrane-bound nucleus and organelles (A)</p> Signup and view all the answers

In prokaryotic cells, where is the DNA located?

<p>'Nucleoid' (B)</p> Signup and view all the answers

What is the main function of a light microscope?

<p>Passing visible light through a specimen to view it (B)</p> Signup and view all the answers

What is the limit to the resolution of optical instruments?

<p>The ability to distinguish two nearby objects (A)</p> Signup and view all the answers

Which type of microscope is used to see a cell's internal structure?

<p>Transmission electron microscope (TEM) (A)</p> Signup and view all the answers

What is the function of stains in light microscopy?

<p>Passing visible light through a specimen more effectively (A)</p> Signup and view all the answers

How do scanning electron microscopes (SEM) differ from transmission electron microscopes (TEM)?

<p>SEM scans the detailed architecture of a cell's surface while TEM focuses on internal structure (C)</p> Signup and view all the answers

What is the source of the image produced in electron microscopy?

<p>Scattering of electrons by metal atoms (B)</p> Signup and view all the answers

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