Assignment_1407-3_-_(Ch27)

Assignment_1407-3_-_(Ch27) - View Attempt 2 of 2 Title...

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Unformatted text preview: View Attempt 2 of 2 Title: Assignment 1407-3 - (Ch27) Started: July 19, 2010 1:08 PM Submitted: July 19, 2010 1:15 PM Time spent: 00:06:42 Total score: 100/100 = 100% Total score adjusted by 0.0 Maximum possible score: 100 Done 1. Mycoplasmas are bacteria that lack cell walls. On the basis of this structural feature, which of the statements below is true about mycoplasmas? Student Response Value A. They lack a cell membrane as well. B. They undergo ready fossilization in sedimentary rock. C. They are gram-negative. D. They are subject to lysis in hypotonic conditions. 100% E. They possess typical prokaryotic flagella. Score: 3.33/3.33 2. Which of the following have been present in Earth's living organisms for the least amount of evolutionary time? Student Response Value A. genes composed of DNA B. photosystems I and II C. nuclei 100% D. enzymes that catalyze glycolysis E. cell walls Score: 3.33/3.33 3. Which of the following statements is correct about gram-negative bacteria? Student Response Value A. Penicillins are the best antibiotics to use against them. B. They often possess an outer membrane containing toxic lipopolysaccharides. 100% C. On a cell-to-cell basis, they possess more DNA than do the cells of any taxonomically higher organism. 7/20/2010 View Attempt …blackboard.com/…/ViewStudentAttem… 1/11 D. Their cell walls are primarily composed of peptidoglycan. E. Their chromosomes are composed of DNA tightly wrapped around large amounts of histone proteins. Score: 3.33/3.33 4. Which of the following is the most common compound in the cell walls of gram-positive bacteria? Student Response Value A. peptidoglycan 100% B. lipopolysaccharide C. lignin D. protein E. cellulose Score: 3.33/3.33 5. Which of the following is the correct order, from most external to most internal? 1. cell wall 2. plasma membrane 3. capsule Student Response Value A. 3, 2, 1 B. 2, 1, 3 C. 1, 3, 2 D. 3, 1, 2 100% E. 1, 2, 3 Score: 3.33/3.33 6. In a bacterium that possesses antibiotic resistance and the potential to persist through very adverse conditions, such as freezing, drying, or high temperatures, DNA should be located within, or be part of, which structures? 1. nucleoid region 2. flagellum 3. endospore 4. fimbriae 5. plasmids Student Response Value A. 1 only B. 2, 4, and 5 7/20/2010 View Attempt …blackboard.com/…/ViewStudentAttem… 2/11 C. 1 and 5 D. 1, 3, and 5 100% E. 1 and 4 Score: 3.33/3.33 7. The typical prokaryotic flagellum features Student Response Value A. a covering provided by the plasma membrane. B. a 9 + 2 pattern of microtubules. C. a complex motor embedded in the cell wall and plasma membrane. 100% D. A and B E. A and C Score: 3.33/3.33 8....
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This note was uploaded on 07/20/2010 for the course BIOL 1407 taught by Professor Simms during the Summer '10 term at HCCS.

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Assignment_1407-3_-_(Ch27) - View Attempt 2 of 2 Title...

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