The group of bacteria that are stained either by Gram-positive stain or by the Gram-negative stain and the group of bacteria that are stained by both. Also, mention the group for which the Gram stain is undefined. Introduction: Gram-positive bacteria take up theÂ crystal violetÂ stain. When viewed through anÂ optical microscope, they appear to be purple in color. The thick peptidoglycan layer in the bacterial cell wall after being washed away still retains theÂ stain. The Gram-negative bacteria are unable to retain the violet stain. The peptidoglycan layer in Gram-negative species is much thicker.

Question

Want to see the full answer?

Answer 1

Question

Chapter 18.1, Problem 2TQ

Summary Introduction

To review:

The group of bacteria that are stained either by Gram-positive stain or by the Gram-negative stain and the group of bacteria that are stained by both. Also, mention the group for which the Gram stain is undefined.

Introduction:

Gram-positive bacteria take up theÂ crystal violetÂ stain. When viewed through anÂ optical microscope, they appear to be purple in color. The thick peptidoglycan layer in the bacterial cell wall after being washed away still retains theÂ stain. The Gram-negative bacteria are unable to retain the violet stain. The peptidoglycan layer in Gram-negative species is much thicker.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Students have asked these similar questions

Match the letter labels in the figure below to the terms. Some letter labels are not used. MNNNNNNIN M C B A M D F E H K G 8

The diagram below illustrates a quorum sensing pathway from Staphylococcus aureus. Please answer the following questions. 1. Autoinduction is part of the quorum sensing system. Which promoter (P2 or P3) is critical for autoinduction? 2)This staphylococcus aureus grows on human wounds, causing severe infections. You would like to start a clinical trial to treat these wound infections. Please describe: a) What molecule do you recommend for the trial. Why? b) Your trial requires that Staphylococcus aureus be isolated from the wound and submitted to genome sequencing before admittance. Why? What are you testing for? 3) If a mutation arises where the Promoter P3 is constitutively active, how would that influence sensitivity to AIP? Please explain your rationale. 4) This pathway is sensitive to bacterial cell density. Describe two separate mutation that would render the pathway active independent of cell density. Briefly explain your rationale. Mutation 1 Mutation 2

There is currently a H5N1 cattle outbreak in North America. According to the CDC on Feb 26*: "A multistate outbreak of HPAI A(H5N1) bird flu in dairy cows was first reported on March 25, 2024. This is the first time that these bird flu viruses had been found in cows. In the United States, since 2022, USDA has reported HPAI A(H5N1) virus detections in more than 200 mammals." List and describe two mechanisms that could lead to this H5N1 influenza strain evolving to spread in human: Mechanisms 1: Mechanisms 2: For the mutations to results in a human epidered they would need to change how the virus interacts with the human host. In the case of mutations that may promote an epidemic, provide an example for: a protein that might incur a mutation: how the mutation would change interactions with cells in the respiratory tract (name the receptor on human cells) List two phenotypic consequence from this mutation that would increase human risk