Principles of Human Physiology (6th Edition)
Principles of Human Physiology (6th Edition)
6th Edition
ISBN: 9780134169804
Author: Cindy L. Stanfield
Publisher: PEARSON
bartleby

Concept explainers

Question
Book Icon
Chapter 23, Problem 1E
Summary Introduction

Introduction:

Pathogens are divided into five classes: bacteria, fungi, parasites, viruses and protozoa. Pathogens are the disease causing organisms and may invade human body through different pathways. Some are unicellular and some are multicellular based on complexity of their structure. Unicellular organisms are single celled organisms unlike multicellular organisms which have more than one cell. Unicellular are often called as prokaryotes.

Expert Solution & Answer
Check Mark

Answer to Problem 1E

Solution:

The correct answer is option (b) bacteria.

Explanation of Solution

Explanation/justification for the correct answer:

Option (b) Bacteria. Bacteria are microscopically single celled organism with very simple cell structure. They are the unicellular prokaryotes which lack neatly packed DNA within a nucleus unlike prokaryotes; instead the DNA material is free floating. They also membrane bound organelles.

Explanation for incorrect answer:

Option (a) Virus. The viruses are composed of DNA/RNA fragments encapsulated within protein material. It has no organelles like any other cells and also lacks the capability of dividing.

Option (c) Fungi. The fungi are a member of eukaryotic group which are multicellular organisms. They have chitin in their cell wall that makes them different from other classes like plant or animal.

Option (d) Parasite. Parasites are the organisms that live in another organism called its host. They use host’s resources to live, generally by causing harm to its host. They may be microorganisms or may reach over 30 meters in length.

Option (e) None of these. Bacteria are the unicellular organisms among above options, hence this cannot be a correct option.

Conclusion

Bacteria are the unicellular organisms, made up of only one cell and having no defined organelles. Hence, the correct answer is option (b) Bacteria.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Chapter 23 Solutions

Principles of Human Physiology (6th Edition)

Ch. 23.3 - Prob. 3CTQCh. 23.3 - Prob. 23.4.1QCCh. 23.3 - Prob. 23.4.2QCCh. 23.3 - Prob. 23.4.3QCCh. 23.3 - Prob. 23.4.4QCCh. 23.4 - Prob. 23.5.1QCCh. 23.4 - Prob. 23.5.2QCCh. 23.4 - Prob. 23.5.3QCCh. 23.5 - Prob. 23.6.1QCCh. 23.5 - Prob. 23.6.2QCCh. 23.5 - Prob. 23.6.3QCCh. 23.5 - Prob. 23.6.4QCCh. 23.6 - Prob. 1CTQCh. 23.6 - Prob. 2CTQCh. 23.6 - Prob. 3CTQCh. 23.6 - Prob. 23.7.1QCCh. 23.6 - Prob. 23.7.2QCCh. 23.6 - Prob. 1aCTQCh. 23.6 - Prob. 2aCTQCh. 23.6 - Prob. 3aCTQCh. 23.6 - Which class of antibody is induced in allergies...Ch. 23.6 - Does rheumatoid arthritis result from a humoral...Ch. 23.6 - Name two lymphoid organs that are innervated by...Ch. 23.6 - Prob. 1bCTQCh. 23.6 - Prob. 2bCTQCh. 23.6 - Prob. 3bCTQCh. 23 - Prob. 1ECh. 23 - Prob. 2ECh. 23 - Prob. 3ECh. 23 - Lymphocytes contact foreign antigen in all of the...Ch. 23 - Which of the following is not true about humoral...Ch. 23 - Macrophages a. are derived from monocytes. b....Ch. 23 - Activated cytotoxic T cells release pore-forming...Ch. 23 - Prob. 8ECh. 23 - Prob. 9ECh. 23 - Foreign antigens phagocytosed by macrophages are...Ch. 23 - Of the following events, which occurs earliest in...Ch. 23 - Prob. 12ECh. 23 - Prob. 13ECh. 23 - Prob. 14ECh. 23 - Prob. 15ECh. 23 - Fill in the blank with the abbreviation for the...Ch. 23 - Fill in the blank with the letter that applies to...Ch. 23 - A person who experiences life-threatening allergic...Ch. 23 - Prob. 19ECh. 23 - Prob. 20ECh. 23 - Prob. 21ECh. 23 - Prob. 22ECh. 23 - Prob. 23ECh. 23 - Prob. 24ECh. 23 - Prob. 25ECh. 23 - Immune responses exhibit four features, all of...Ch. 23 - Prob. 27ECh. 23 - Prob. 28ECh. 23 - Prob. 29ECh. 23 - Prob. 30E
Knowledge Booster
Background pattern image
Biology
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.
Recommended textbooks for you
Text book image
Human Anatomy & Physiology (11th Edition)
Biology
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:PEARSON
Text book image
Biology 2e
Biology
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:OpenStax
Text book image
Anatomy & Physiology
Biology
ISBN:9781259398629
Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa Stouter
Publisher:Mcgraw Hill Education,
Text book image
Molecular Biology of the Cell (Sixth Edition)
Biology
ISBN:9780815344322
Author:Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter Walter
Publisher:W. W. Norton & Company
Text book image
Laboratory Manual For Human Anatomy & Physiology
Biology
ISBN:9781260159363
Author:Martin, Terry R., Prentice-craver, Cynthia
Publisher:McGraw-Hill Publishing Co.
Text book image
Inquiry Into Life (16th Edition)
Biology
ISBN:9781260231700
Author:Sylvia S. Mader, Michael Windelspecht
Publisher:McGraw Hill Education