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Ch. 2 - Chemical Principles
Tortora - Microbiology: An Introduction 14th Edition
Tortora14th EditionMicrobiology: An IntroductionISBN: 9780138200398당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Tortora 14th EditionCh. 2 - Chemical Principles문제 1
2장, 문제 1

What is a chemical element?

검증된 단계별 안내
1
Understand that a chemical element is a fundamental substance that cannot be broken down into simpler substances by chemical means.
Recognize that each chemical element is defined by the number of protons in its atomic nucleus, known as the atomic number.
Know that elements are the building blocks of matter and combine to form compounds through chemical reactions.
Identify that each element has unique properties and is represented by a chemical symbol, such as H for hydrogen or O for oxygen.
Summarize that in microbiology, elements like carbon, nitrogen, and phosphorus are essential for the structure and function of microorganisms.

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주요 개념

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Definition of a Chemical Element

A chemical element is a pure substance consisting of only one type of atom, characterized by its unique number of protons in the nucleus, known as the atomic number. Elements cannot be broken down into simpler substances by chemical means.
추천 영상:
03:36
Elements of Life

Atoms and Atomic Structure

Atoms are the basic units of matter, composed of protons, neutrons, and electrons. The number of protons defines the element, while electrons determine chemical behavior. Understanding atomic structure helps explain why elements have distinct properties.
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04:48
Atomic Structure

Periodic Table and Element Classification

The periodic table organizes all known chemical elements based on their atomic number and properties. It helps predict element behavior, relationships, and trends, providing a framework for studying chemical elements systematically.
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03:36
Elements of Life
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교과서 질문

Radioisotopes are frequently used to label molecules in a cell. The fate of atoms and molecules in a cell can then be followed. This process is the basis for the following question.


If Pseudomonas bacteria are supplied with radioactively labeled cytosine, after a 24-hour incubation period this cytosine would most likely be found in the cells’

a. Carbohydrates.

b. DNA.

c. Lipids.

d. Water.

e. Proteins.

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교과서 질문

What type of bond holds the following atoms together?

a. Li+ and Cl- in LiCl

b. Carbon and oxygen atoms in methanol

c. Oxygen atoms in O2

d. A hydrogen atom of one nucleotide to a nitrogen or oxygen atom of another nucleotide in:

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교과서 질문

Diagram the electronic configuration of a carbon atom.

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교과서 질문

Radioisotopes are frequently used to label molecules in a cell. The fate of atoms and molecules in a cell can then be followed. This process is the basis for the following question.


Assume E. coli bacteria are grown in a nutrient medium containing the radioisotope 16N. After a 48-hour incubation period, the 16N would most likely be found in the E. coli’s

a. Carbohydrates.

b. Lipids.

c. Proteins.

d. Water.

e. None of the above

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