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Chapter 4: Microscopes in A Tour of the Cell

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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?

Higher ratio facilitates better exchange Signup and view all the answers

What distinguishes eukaryotic cells from prokaryotic cells?

Presence of membrane-bound nucleus and organelles Signup and view all the answers

In prokaryotic cells, where is the DNA located?

'Nucleoid' Signup and view all the answers

What is the main function of a light microscope?

Passing visible light through a specimen to view it Signup and view all the answers

What is the limit to the resolution of optical instruments?

The ability to distinguish two nearby objects Signup and view all the answers

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

Transmission electron microscope (TEM) Signup and view all the answers

What is the function of stains in light microscopy?

Passing visible light through a specimen more effectively Signup and view all the answers

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

SEM scans the detailed architecture of a cell's surface while TEM focuses on internal structure Signup and view all the answers

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

Scattering of electrons by metal atoms Signup and view all the answers