1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
lana66690 [7]
4 years ago
9

Suppose you are trying to identify an unknown bacterial species. You perform a Gram stain and the slide is a blue/purple color w

hen you are finished. Are the bacteria gram-positive or gram-negative?
Biology
1 answer:
mixas84 [53]4 years ago
4 0

Answer:

IN GRAMS stain bacteria having blue /purple colour are <u>GRAM positive</u><u> </u>bacteria.

Explanation:

GRAM staining is the technique to differentiate bacteria on the basis of stain. In this procedure bacterial cells with blue/purple colour are Gram positive and cells with pink colour are Gram negative.

                                            PROCEDURE

  • In the first step cells are stained with crystal violet dye which is blue in color.
  • Then Grams iodine solution is added, it forms a complex between dye and iodine. This complex is insoluble in water.
  • Next step is addition of ethyl alcohol as a decolorizing agent. It shrinks the peptidoglycan layer by dehydrating it. In gram negative bacteria on the treatment of alcohol this complex( crystal violet- iodine complex) comes out from the outer membrane because of thin peptidoglycan layer. Gram negative bacteria lost color and decolorized. While in Gram positive bacteria because of thick peptidoglycan ,crystal violet-iodine complex trapped in the membrane. And cells don't give violet color of dye.
  • After this a counterstain safranine is used, which can not color the stained Gram positive bacteria. Gram negative decolorized bacteria stain pink with safranine.

 

You might be interested in
Teddy is explaining to his class that hydrothermal vents form isolated ecosystems. Which point should he explain? A. The organis
ladessa [460]

Answer:

A

Explanation:

In such an isolated ecosystem, there is usually an autotroph species that coverts the abiotic elements in the environment to biotic elements. In  a hydrothermal vent, it is likely that there are some chemoautotrophic bacteria that covert the sulfur and other chemicals in the water into organic molecules. This energy is then transferred up the food web in the closed ecosystem.  In such an ecosystem, even the waste product of one life form may be utilized by another species.

3 0
4 years ago
A woman buys a packet of seeds for red flowering plants. In the spring, she plants the seeds in her garden and enjoys beautiful
AnnyKZ [126]

Answer:

<h2>because she says that some of them grew white and some grew red.</h2>

Explanation:

<h2>idk if this is correct</h2><h2 />
7 0
3 years ago
What are elements found in proteins
sweet-ann [11.9K]

Answer:

Carbon Hydrogen Oxygen and Nitrogen.

Explanation:

Have you heard about Cho Cho Chon Chonp?

6 0
3 years ago
Read 2 more answers
The fovea has the greatest visual acuity in bright light primarily because the fovea is:.
Contact [7]

The fovea has the greatest visual acuity in bright light primarily because the fovea is has the highest density of narrow and elongated cone receptors.

<h3>The light sensitive area of the eye</h3>

The eye is one of the sense organs that is use for sight by mammals. It contains the following parts:

  • Pupils,

  • Cornea,

  • Choroid,

  • Retina,

  • Conjunctiva and

  • lris.

All the images refracted by the eye lens is focused on the retina.

The fovea is part of the retina that is made up of high concentration of cone cells that helps to maximize light detection.

Therefore, the fovea has the greatest visual acuity in bright light primarily because the fovea is has the highest density of narrow and elongated cone receptors.

Learn more about fovea here:

brainly.com/question/7068039

6 0
2 years ago
What is mass?
Ad libitum [116K]

Answer:

Mass is the amount of matter in a substance measured in kilograms

3 0
2 years ago
Other questions:
  • Penelope is an acrobat that often flips and turns in the air. her ability to know where her head is in relation to the ground is
    6·1 answer
  • How does the period of a comet relate to a comet's orbit?
    9·1 answer
  • PLEASE HELP IF YOU KNOW THE ANSWER QUICK!!!!!!! DIRECTIONS: Use no spaces or punctuation to answer the following question, capit
    8·2 answers
  • Why would a lack of neurotransmitters cause a problem in the nervous system??
    10·2 answers
  • The part of an animal cell that serves as barrier between the cell and its environment is the A. nucleus. B. cytoplasm. C. mitoc
    12·2 answers
  • What is the most common molecule in living things
    13·2 answers
  • DNA and RNA are both
    5·1 answer
  • Which of the following could be considered working for the public interest?
    5·2 answers
  • Is a virus prokaryotic or eukaryotic?<br> eukaryotic<br> can be both<br> neither
    13·1 answer
  • Question 15
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!