Microbiology: An Introduction
11th Edition
ISBN: 9780321733603
Author: Gerard J. Tortora, Berdell R. Funke, Christine L. Case
Publisher: Benjamin Cummings
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Textbook Question
Chapter 4, Problem 3MCQ
Which statement best describes what happens when a gram-negative bacterium is placed in distilled water and penicillin?
- a. No change will result; the solution is isotonic.
- b. Water will move into the cell.
- c. Water will move out of the cell.
- d. The cell will undergo osmotic lysis.
- e. Sucrose will move into the cell from an area of higher concentration to one of lower concentration.
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A particular bacterium requires techoic acid in its medium in order to grow. What would the bacterium not be able to synthesize if you were to omit the techoic acid?
A. Plasma membrane
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D. None of the above
What kind of work is involved when a bacterial cell rotates its flagellum for "run and tumble" mechanism?
a. Transport
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If a Gram-positive bacteria is treated with penicillin, and then placed into a hypotonic solution, what is likely to happen to the cell?
O A. osmotic lysis
OB. plasmolysis
O C. nothing would happen
O D. bacteria cell would go into dormant state.
Chapter 4 Solutions
Microbiology: An Introduction
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 - 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 - 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 - 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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- What will happen when an animal cell is placed in a hypertonic solution? A. The cell will swell because water moves in. B. The cell will shrink because water moves out. C. The cell will swell because salt moves in. D. The cell will shrink because salt moves out.arrow_forwardMolecules that are too large to be moved across a cell membrane can enter the cell by? A. Diffusion B. Passive transport C. Osmosis D. Active transport B.passivearrow_forwardWhat determines which way materials move during diffusion and osmosis? a. concentration gradient b. polarity c. crenation d. particle sizearrow_forward
- If a cell is hypertonic to its environment, what may happen as a result of osmosis? A. its volume may fluctuate up and down B. nothing C. it may shrivel up D. solutes may move out of the cell E. it may explodearrow_forwardFor bacteria to infect cells, it produces an extracellular protease that destroys tissue structure particularly transmembrane proteins. The bacteria are grown in culture so that the protease can be isolated. Then the culture is centrifuged. In which sample would the protease be most likely found? A. Precipitate containing whole bacteria B. Cell-free filtrate; that is, the supernatant C. The lysate of the whole culture D. Lysed bacteria only E. All of thesearrow_forwardSelect a statement that is not correct about bacterial fimbriae? A. they protect the cell from dehydration B. they are called attachment pili to distinguish them from the pili used to transfer DNA during conjugation C. they are used to attach the cell to its substrate or to other prokaryote D. they are hair-like projections that aid in attachment.arrow_forward
- What controls the direction of movement of ions across the membrane? A. Peripheral proteins B. Channel proteins C. Plasmodesmata D. Carrier proteinsarrow_forwardWhich of the following statement about the bacterial cell wall is INCORRECT? a. The cell wall is relatively nonpermeable and restricts the passage of sugars and amino acids. b. Gram-positive cells have more peptidoglycan in theircell walls than Gram-negative cells. c. Gram-negative cells have a membrane both inside andoutside their cell walls. d. The cell wall establishes a bacterium’s shape as a coccus,bacillus, or spirillum.arrow_forwardCompare and contrast the Gram-positive and Gram-negative bacterial cell walls. Discuss the cell wall components that make the Gram-positive and Gram-negative bacterial cell wall different from each other. Explain why you think one cell wall is stronger than the other.arrow_forward
- When Elodea leaves were placed in 10% NaCl, what was the result? a. The cell membrane shrank away from the cell wall because the solution was hypertonic. b. The cell membrane shrank, but the central vacuole remained full. c. The cells burst because the solution was hypotonic. d. The cell became turgid.arrow_forwardWhich of these molecules provides squish to the ECM? a. Elastin b. Hydrated Matrix c. Fibronectin d. Collagen e. Integrinarrow_forwardWhat is the function of a cell wall?Single choice. A. to protect and support the cell B. to perform different functions in each cell C. to prevent water from passing through itarrow_forward
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