Microbiology: An Introduction (13th Edition)
13th Edition
ISBN: 9780134605180
Author: Gerard J. Tortora, Berdell R. Funke, Christine L. Case, Derek Weber, Warner Bair
Publisher: PEARSON
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Textbook Question
Chapter 4, Problem 10R
NAME IT What group of microbes is characterized by cells that form filaments, reproduce by spores, and have peptidoglycan in their cell walls?
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In the diagram below, identify the structures of a cyanobacterial cell based on the following descriptions:
a) Outer cellular covering which includes:
Mucilaginous layer – outermost layer covering the cell wall; protects the cell from harmful factors of the environment
Cell wall – found just below the mucilaginous layer; 2 or 3-layered, the inner layer lies in between the outer wall layer and plasma membrane; the outer layer is made of peptidoglycan
Innermost plasma membrane – selectively permeable membrane enclosing the cytoplasm
b) Cytoplasm – found below the plasma membrane; the protoplasm which contains structures of different shapes and functions. Lamellae, which contain pigments such as chlorophylls, carotenes, xanthophylls, phycoerythrin and phycocyanin, are located in the peripheral region of cytoplasm. Ribosomes may also be found scattered in the cytoplasm.
c) Nucleic material – the nucleoplasm that is centrally located in the cell and contains chromatin in the form…
Mycoplasmas are bacteria that lack cell walls. On the basis of this structural feature, which statement concerning mycoplasmas should be true?
They are gram-negative.
They are subject to lysis in hypotonic conditions.
They lack a cell membrane as well.
They should contain less cellulose than do bacteria that possess cell walls.
They possess typical prokaryotic flagella.
Bacteria of the genus Mycoplasma are distinguished from other bacterial cells by
1) cell walls composed solely of amino acids.
O 2) the absence of a cytoplasmic membrane.
O 3) the absence of a cell wall.
O 4) Have large capsules.
5) the presence of mycolic acid in their cell walls.
Chapter 4 Solutions
Microbiology: An Introduction (13th Edition)
Ch. 4 - DRAW IT Diagram each of the following flagellar...Ch. 4 - Endospore formation is called (a) _____. It is...Ch. 4 - DRAW IT Draw the bacterial shapes listed in (a),...Ch. 4 - Match the structures in column A to their...Ch. 4 - Why is an endospore called a resting structure? Of...Ch. 4 - Compare and contrast the following a. simple...Ch. 4 - Prob. 7RCh. 4 - Starch is readily metabolized by many cells, but a...Ch. 4 - Match the characteristics of eukaryotic cells in...Ch. 4 - NAME IT What group of microbes is characterized by...
Ch. 4 - Which of the following is not a distinguishing...Ch. 4 - Which statement best describes what happens when a...Ch. 4 - Which statement best describes what happens when a...Ch. 4 - Which statement best describes what happens when a...Ch. 4 - Which of the following statements best describes...Ch. 4 - Which of the following is false about fimbriae? a....Ch. 4 - Which of the following pairs is mismatched? a....Ch. 4 - Which of the following pairs is mismatched? a....Ch. 4 - You have isolated a motile, gram-positive cell...Ch. 4 - The antibiotic amphothericin B disrupts plasma...Ch. 4 - How can prokaryotic cells be smaller than...Ch. 4 - The smallest eukaryotic cell is the motile alga...Ch. 4 - Two types of prokaryotic cells have been...Ch. 4 - In 1985, a 0.5-mm cell was discovered in...Ch. 4 - When E. coli cells are exposed to a hypertonic...Ch. 4 - Clostridium botulinum is a strict anaerobe; that...Ch. 4 - A South San Francisco child enjoyed bath time at...Ch. 4 - Live cultures of Bacillus thuringiensis (Dipel)...
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- Which of these word parts means “higher”, or “elevated” or “advanced”? Proto- An- Eu- Which of these microbes are the smallest? Mycoplasma Amoeba Rickettsia Which of these types of microbes has the most complex cell? Bacteria Viruses Protozoa A bacteria cell which is longer than it is wide is classified as: Vibrio Coccus Bacillus Bacteria which normal colonize the human gut are classified as: Anaerobes Pathogens Aerobes A bacteria which absolutely needs oxygen to live is classified as: Obligate anaerobe Obligate aerobe Facultative anaerobe The structure on this list which will NOT be found in any bacterial cell is: Cytoplasm Flagella Nucleus The genetic information of bacteria cell is contained in the: Capsid Nucleoid Ribosomes The genetic material of a virion is called the: Genome Nucleoid Nucleusarrow_forwardMycoplasmas are pleomorphic bacteria. How do the unique structural characteristics of mycoplasmas relate to their bacterial morphology? Mycoplasmas have a low G + C genome content. Mycoplasmas appear Gram negative when a Gram stain is performed. Mycoplasmas lack a cell wall. Mycoplasmas form colonies with a fried-egg appearance.arrow_forwardWhich of the following statement/s is/are true about gram negative bacteria Cell wall has thin peptidoglycan layer Cell wall lipid content is very low Lipopolyscharride layer is present All of the abovearrow_forward
- Once these pathogens enter the host the difference in environmental conditions signals for them to germinate and turn into growing cells. Compare Inhalation anthrax (Bacillus anthracis) to Tetanus (Clostridium tetani). Besides endospores used in transmission, what is a simple explanation to help explain how each microbe survives and grows in each location?arrow_forwardGive the common name of a eukaryotic microbe that is unicellular,walled, nonphotosynthetic, nonmotile, and bud-forming.arrow_forwardEndospores are a) resistant to extreme temperatures b) produced by some prokaryotes c) can survive for decades d) all of the abovearrow_forward
- You are a physician working in a hospital. Your patient is a 65-year-old individual who has been living on the street. Their symptoms include trouble breathing, weakness, and most recently coughing up blood. When gram stained, the bacterium shows no color and most of the antibiotics are not reducing the infection. After reviewing the information from the last physician, you prescribe Isoniazid. Select all of the answers that are correct. Mycolic acid is present in fungal cells Mycolic acid is a waxy substance that can repel many molecules An organism that has mycolic acid has to have access to oxygen and grows very slowly. If there is not gram stain then there is no bacteria present Isonazid targets and destroys mycolic acid. ►arrow_forwardOne major difference in the envelope structure between gram positive bacteria and gram-negative bacteria is the presence or absence of a cytoplasmic membrane. True or false?arrow_forwardA clinical microbiologist is studying a microbe that can cause infections and gastrointestinal disease in humans, and which can also survive and reproduce in mice. A dormant cyst form of the microbe infects human hosts through fecal-oral transmission if they come in contact with mouse droppings and don’t wash their hands before eating. The organism grows in long filaments when grown at 20-28 deg C, and forms round/ovoid cells when grown at temperatures above 28 deg C. Sexual reproduction (fusion of haploid gametes) occurs in both humans and mice. A cell wall is present, and cells contain nuclei. This microbe could be which of the following? Bacterium Fungus Virus Protozoanarrow_forward
- Which of these types of microbes is smallest? yeast spirochete mycoplasma protozoaarrow_forwardWhich microorganism is differentiated based on the spores it is able to produce? Algae Fungi Helminths Protozoaarrow_forwardWhich of the following statements regarding protozoa is false?a) Some protozoa lack mitochondria.b) Some protozoa contain chlorophyll.c) Some protozoa are parasitic.d) Malaria is caused by a protozoan.arrow_forward
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