Textbook Question
A "9 + 2" arrangement of microtubules is seen in __________ .
a. archaeal flagella
b. bacterial flagella
c. eukaryotic flagella
d. all prokaryotic flagella
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Ch. 3 - Cell Structure and Function
Bauman6th EditionMicrobiology with Diseases by TaxonomyISBN: 9780134832302
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Table of contents
- Ch. 1 - A Brief History of Microbiology31
- Ch. 2 - The Chemistry of Microbiology28
- Ch. 3 - Cell Structure and Function39
- Ch. 4 - Microscopy, Staining, and Classification25
- Ch. 5 - Microbial Metabolism51
- Ch. 6 - Microbial Nutrition and Growth37
- Ch. 7 - Microbial Genetics51
- Ch. 8 - Recombinant DNA Technology21
- Ch. 9 - Controlling Microbial Growth in the Environment36
- Ch. 10 - Controlling Microbial Growth in the Body: Antimicrobial Drugs21
- Ch. 11 - Characterizing and Classifying Prokaryotes29
- Ch. 12 - Characterizing and Classifying Eukaryotes34
- Ch. 13 - Characterizing and Classifying Viruses, Viroids, and Prions23
- Ch. 14 - Infection, Infectious Diseases, and Epidemiology35
- Ch. 15 - Innate Immunity34
- Ch. 16 - Adaptive Immunity21
- Ch. 17 - Immunization and Immune Testing29
- Ch. 18 - Immune Disorders22
- Ch. 19 - Pathogenic Gram-Positive Bacteria25
- Ch. 20 - Pathogenic Gram-Negative Cocci and Bacilli28
- Ch. 21 - Rickettsias, Chlamydias, Spirochetes, and Vibrios25
- Ch. 22 - Pathogenic Fungi47
- Ch. 23 - Parasitic Protozoa, Helminths, and Arthropod Vectors44
- Ch. 24 - Pathogenic DNA Viruses23
- Ch. 25 - Pathogenic RNA Viruses30
- Ch. 26 - Applied and Industrial Microbiology29
- Ch. 27 - Microbial Ecology and Microbiomes22
Bauman6th EditionMicrobiology with Diseases by TaxonomyISBN: 9780134832302Not the one you use?Change textbook
Chapter 3, Problem 4
Which of the following is most associated with diffusion?
a. Symports
b. Antiports
c. Carrier proteins
d. Endocytosis
Verified step by step guidance1
Step 1: Understand the concept of diffusion. Diffusion is the passive movement of molecules from an area of higher concentration to an area of lower concentration without the use of energy.
Step 2: Review the options given: a) Symports, b) Antiports, c) Carrier proteins, d) Endocytosis.
Step 3: Recognize that symports and antiports are types of active transport mechanisms that move substances against their concentration gradients, often using energy.
Step 4: Note that carrier proteins can facilitate diffusion by helping molecules cross the membrane down their concentration gradient without energy input, a process called facilitated diffusion.
Step 5: Understand that endocytosis is an energy-dependent process where cells engulf large particles or fluids, which is not related to diffusion.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Diffusion
Diffusion is the passive movement of molecules from an area of higher concentration to an area of lower concentration, without the use of energy. It is a fundamental process for the transport of small, nonpolar molecules across cell membranes.
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02:10
Diffusion
Carrier Proteins
Carrier proteins facilitate the transport of specific molecules across the cell membrane, often by changing shape. They can mediate both passive transport (facilitated diffusion) and active transport, depending on whether energy is used.
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02:50Proteins
Symports and Antiports
Symports and antiports are types of carrier proteins involved in active transport. Symports move two substances in the same direction, while antiports move them in opposite directions, both often using energy indirectly to move molecules against their concentration gradients.
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03:28Classes of Membrane Transport Proteins
Related Practice
Textbook Question
Which of the following is true of Svedbergs?
a. They are not exact but are useful for comparisons.
b. They are abbreviated “sv.”
c. They are prokaryotic in nature but exhibit some eukaryotic characteristics.
d. They are an expression of sedimentation rate during high-speed centrifugation.
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Textbook Question
Which of the following is not a function of a glycocalyx?
a. It forms pseudopods for faster mobility of an organism.
b. It can protect a bacterial cell from drying out.
c. It hides a bacterial cell from other cells.
d. It allows a bacterium to stick to a host.
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Textbook Question
Which of the following is not associated with prokaryotic organisms?
a. Nucleoid
b. Glycocalyx
c. Cilia
d. Circular DNA
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Textbook Question
A local newspaper writer has contacted you, an educated microbiology student from a respected college. He wants to obtain scientific information for an article he is writing about “life” and poses the following query: “What is the difference between a living thing and a nonliving thing?” Knowing that he will edit your material to fit the article, give an intelligent, scientific response.
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Textbook Question
The term fluid mosaic has been used in describing the cytoplasmic membrane. How does each word of that phrase accurately describe our current understanding of a cell membrane?
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