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Chapter 4: Q. 27 (page 126)

In what situation(s) would a transmission electron microscope be ideal, and why?

Short Answer

Expert verified

Transmission electron microscopy uses a beam of electrons that pass through thin sections of the specimen to produce high-resolution images of the internal structures of cells.

Step by step solution

01

Introduction

Transmission electron microscopy (TEM) uses a fine beam of electrons directed on a thin slice of a specimen by electromagnetic lenses. The electrons passing through the specimen are collected on a detector to produce an image.

02

Explanation

Transmission electron microscopy (TEM) can produce images with a resolution of 0.2nm. The area of the specimen that has less density will allow more electrons to pass through generating a brighter image. A darker image is obtained in areas of high density. This contrast provides information on the structure, shape, texture, and size of the specimen.

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Most popular questions from this chapter

Which of the following sequences correctly lists in order the steps involved in the incorporation of a proteinaceous molecule within a cell?

a. protein synthesis of the protein on the ribosome; modification in the Golgi apparatus; packaging in the endoplasmic reticulum; tagging in the vesicle

b. synthesis of the protein on the lysosome; tagging in the Golgi; packaging in the vesicle; distribution in the endoplasmic reticulum

c. synthesis of the protein on the ribosome; modification in the endoplasmic reticulum; tagging in the Golgi; distribution via the vesicle

d. synthesis of the protein on the lysosome; packaging in the vesicle; distribution via the Golgi; tagging in the endoplasmic reticulum

Antibiotics are medicines that are used to fight bacterial infections. These medicines kill prokaryotic cells without harming human cells. What part or parts of the bacterial cell do you think antibiotics target? Why?

The ________ is the basic unit of life.

a. organism

b. cell

c. tissue

d. organ

Bacteria that lack fimbriae are less likely to ________.

a. adhere to cell surfaces

b. swim through bodily fluids

c. synthesize proteins

d. retain the ability to divide

Explain how the extracellular matrix functions?
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