1. Given that the total magnification for the Anabaena photomicrograph above is 400X, and the magnification of the eubacterial cells in Exercise 1 (above) is 1000X, are these Anabaena larger or smaller than the eubacteria? Approximately how much larger/smaller are they? 2. What is the mechanism of action of Crystal Violet (i.e. what does it do to the cells and how does it do it)? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a. CV turns only Gram positive cells purple by interacting with the cells' peptidoglycan. Gram negative cells do not change colour. b. CV turns all cells purple by interacting with the cells' peptidoglycan. c. CV turns all cells pink by interacting with the cells' peptidoglycan. d. CV turns all cells purple by interacting with the hydrophobic layers in the cell membrane. e. CV turns all cells pink by interacting with the hydrophobic layers in the cell membrane. 3. What is the mechanism of action of the 95% Ethanol? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a. It removes the Crystal Violet + Gram's Iodine complex from all cells' lipid bilayers. b.It removes the Crystal Violet + Gram's Iodine complex from Gram negative cells' peptidoglycan. c. It reduces the Crystal Violet to a colourless form. d. It removes the Crystal Violet + Gram's Iodine complex from Gram negative cells' lipid bilayers. e. It removes the Crystal Violet + Gram's Iodine complex from all cells' peptidoglycan.

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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1. Given that the total magnification for the Anabaena photomicrograph above is 400X, and the magnification of the eubacterial cells in Exercise 1 (above) is 1000X, are these Anabaena larger or smaller than the eubacteria? Approximately how much larger/smaller are they?

2. What is the mechanism of action of Crystal Violet (i.e. what does it do to the cells and how does it do it)?

Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer.

a. CV turns only Gram positive cells purple by interacting with the cells' peptidoglycan. Gram negative cells do not change colour.

b. CV turns all cells purple by interacting with the cells' peptidoglycan.

c. CV turns all cells pink by interacting with the cells' peptidoglycan.

d. CV turns all cells purple by interacting with the hydrophobic layers in the cell membrane.

e. CV turns all cells pink by interacting with the hydrophobic layers in the cell membrane.

3. What is the mechanism of action of the 95% Ethanol?

Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer.

a. It removes the Crystal Violet + Gram's Iodine complex from all cells' lipid bilayers.

b.It removes the Crystal Violet + Gram's Iodine complex from Gram negative cells' peptidoglycan.

c. It reduces the Crystal Violet to a colourless form.

d. It removes the Crystal Violet + Gram's Iodine complex from Gram negative cells' lipid bilayers.

e. It removes the Crystal Violet + Gram's Iodine complex from all cells' peptidoglycan.

4. What is the mechanism of action of Safranin?

Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer.

a.It stains all cells pink-red.

b. It stains only the Gram negative cells pink-red.

c. It stains all cells purple.

d. It stains only the Gram negative cells purple.

e. It stains only the Gram positive cells purple.

5. How much larger/smaller is a single Oscillatoria cell compared to a single Anabaena cell?

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