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
Ilia_Sergeevich [38]
3 years ago
13

Melissa is studying a Gram-stained slide of curd bacteria. She sees many rod-shaped, violet-colored bacteria.

Biology
2 answers:
Genrish500 [490]3 years ago
7 0

Answer:

They are gram positive bacteria

Explanation:

To find out if the bacteria is gram negative or gram positive, the Gram Test is done. This test allows bacteria to be viewed under the light microscope, since without staining it is impossible to observe or identify their structure. The Gram Test involves 3 main steps:

• Crystal violet staining (a water soluble dye, purple);

• Discoloration (using ethanol / acetone);

• Counterstaining (using Safranina dye, red).

After the test, bacteria that are violet-colored in the dye (such as the bacteria Melissa is observing) are called Gram positive. Gram-positive bacteria retain the violet crystal due to the presence of a thick layer of peptidoglycan (a polymer made up of sugars and amino acids that originates from a mesh outside the cell membrane of the bacteria) in their cell walls, showing the color Violet.  Gram-negative bacteria, on the other hand, have a thinner peptidoglycan wall that does not retain the violet crystal during the discoloration process and are red in the final staining process.

fgiga [73]3 years ago
6 0
It seems that you have missed the necessary options for us to choose from, but anyway, here is the answer. When Melissa is  studying a Gram-stained slide of curd bacteria, she <span>sees many rod-shaped, violet-colored bacteria and the type of bacteria are they are LACTOBACILLI. Hope this answers your question.</span>
You might be interested in
What are gametes? Gametes are seeds. Gametes are spores. Gametes are a part of asexual reproduction. Gametes are sex cells, like
Alex Ar [27]
Gametes are sex cells. They are sperm and egg.
5 0
2 years ago
A gyre is _____.
butalik [34]

Answer:

A

Explanation:

Gryes are know as spirals or vortexs, especially in the oceans

8 0
3 years ago
Point mutations in noncoding regions of dna result in __________.
vladimir2022 [97]
<h2>Answer </h2>

Neutral Variation

<u>Explanation</u>

Point mutations in noncoding regions of DNA result in neutral variation. The alleles which neither considerably sum to nor exceedingly lower from body consistency. It is the accumulation of such alleles located within a community that can be explained as expressing neutral variation. Neutral Variation implies in various alleles that are existing at an assigned genetic locus because those alleles are not distinct by natural selection.

3 0
3 years ago
Choose the correct sequence of the prokaryotic operon. A) gene, operator, promoter B) promoter, operator, gene C) operator, prom
Harrizon [31]

Answer:

The correct answer is option B, that is, promoter, operator, gene.

Explanation:

In a prokaryote, just in front of the operator, the promoter is located, and just in front of the structural genes, the operator is located. All these in combination give rise to an operon.  

Any gene, which codes for an enzyme or a structural protein is termed as a structural gene, in the lac operon, a structural gene codes for three distinct kinds of enzymes. A short sequence of DNA is situated just in front of the structural gene, which is known as the operator. An operator functions as a switch for transcription, that is, it monitors whether the process of transcription will take place or not.  

Just in front of an operator, a sequence of a promoter is present, and for the transcription and translation of all the structural genes, the RNA polymerase needs to combine first with the promoter. In case, if no transcription is to take place, then the operator allows the repressor to bind with it and prevent the attachment of RNA polymerase with the promoter. Hence, the correct sequence of a prokaryotic operon is a promoter, operator, and gene.  

4 0
2 years ago
Why is a lack of oxygen fatal to cells?
sveticcg [70]
Oxygen is a vital element within cellular respiration. An intrinsic part of the cellular respiration cycle is the transfer or electrons through the electron transport chain, and at the end of it exists the mitochondria, in which electrons are donated to the Oxygen and combine with hydrogen ions to form water.
6 0
3 years ago
Other questions:
  • How do the tectonic plate interactions build mountains and cause volcanic eruptions?
    13·1 answer
  • match the following column I.a.saprotrophs b. chlorophyll B .bacteria rhizobium d.cuscutae. e.insects f .mango tree g.leaf h. ti
    7·1 answer
  • This graph displays Earth's water distribution. Based on the other data shown on the graph, what percentage of Earth's water dis
    5·1 answer
  • I really need help please don’t answer If u donr know
    8·1 answer
  • DNA and RNA differ in all BUT one of the following ways.
    7·1 answer
  • Who formulated the Universal law of Gravitation (G)​
    8·1 answer
  • 2. How are the differences in animal cells related to their functions?
    9·1 answer
  • __________ in carbon dioxide in your tissues leads to __________ in pH of cerebrospinal fluid and blood, which ultimately causes
    11·1 answer
  • Plsssssssssssssssss help me all for brain liest ty :DD
    6·1 answer
  • Select all of the choices that are true regarding tides...
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!