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Ymorist [56]
3 years ago
14

Define the 3 major shapes of bacteria

Biology
1 answer:
dybincka [34]3 years ago
8 0
<span>CocciThe most common of the 3 shapes of bacteria is cocci, or round bacteria. An example of a bacteria that appears round is Streptococcus. There are several variations of Streptococci, and they are distinguished in part by their arrangement. Some Streptococci exist in pairs, such as Streptococcus pneumonia, which can cause pneumonia. Others are joined in chains. One of the most well-known Streptococci is Group A Beta hemolytic Streptococci. Beta hemolysis appears as a clear area surrounding the colony growing on a blood agar plate. The hemolysis occurs because of a hemolysin the organism emits which breaks down red blood cells. This is useful in distinguishing Group A Beta Strep from other less virulent strains of Streptococci.Another cocci, which can be serious, is Staphylococcus aureus. Staph aureus appears in grape-like clusters under a microscope and has become resistant to many types of antibiotics. A variant of Staph aureus is called methicillin-resistant Staph aureus, which is often found in hospital acquired infections and has mutated due to overuse of antibiotics. It is very difficult to treat methicillin-resistant Staph aureus (MRSA).BacilliAnother of the 3 shapes of bacteria is bacilli. These are rod shaped, gram positive organisms. One of the most commonly known bacilli is Bacillus antracis, which is the bacteria that can cause anthrax. Bacillus antracis, as well as other strains of Bacillus, are typically found in soil and are usually not harmful to humans.Lactobacillus is another common gram positive bacilli found in many probiotics. It is helpful for the digestive system, providing what are considered "good" bacteria for healthy digestion. There are a number of varieties of Lactobacilli found in probiotics, such as Kiefer.SpirillumSpirillum are spiral shaped bacteria that stain gram negative. They move with tufts of flagella located at both ends. One of the most common spirillum that affects humans is Treponema pallidum, which causes syphilis. Most spirilla affect animals; however, there is a variety that can cause rat bite fever in humans.</span>
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Bioluminescence occurs through a chemical reaction that produces light energy within an organism's body. For a reaction to occur, a species must contain luciferin, a molecule that, when it reacts with oxygen, produces light. ... Many organisms also produce the catalyst luciferase, which helps to speed up the reaction

Hope i helped you :)
4 0
3 years ago
Diferencia entre estimulo y receptor
Archy [21]

Explanation:

Un estimulo es cualquier cambio que es capaz de producir una respuesta por parte del organismo. Los receptores son estructuras muy especializadas capaces de percibir los estímulos y convertirlos en impulsos nerviosos

7 0
3 years ago
A scientist is comparing the outer structure of an onion cell, structure X, to the outer structure of a human skin cell, structu
hammer [34]

Answer:

Structure X is only found in plant cells, and structure Y is found in plant and animal cells.  

Explanation:

The structure found on the outside of the onion cell is the cell wall, which is specific to plants. The structure found on the outside of the skin cell is the cell membrane, which is found on all cells.

Structure X is not living, and structure Y is living.  - this is false, both animal and plant cells are living.

Structure X can be found in some human cells, and structure Y can be found in some plant cells.  - this is false, the opposite is true.

Structure X is only found in plant cells, and structure Y is found in plant and animal cells.  - this is true structure X is the plant cell wall, and structure Y is the cell membrane

Structure X is semipermeable, and structure Y is selectively permeable. Semi-permeable and selectively permeable are essentially the same thing - it means the barrier allows some substances to pass through but not others.

4 0
3 years ago
Read 2 more answers
Can someone pls help with this :)
solmaris [256]

Answer:

What are mycorrhizal fungi?

  • Mycorrhizal fungi are critical members of the plant microbiome, forming a symbiosis with the roots of most plants on Earth.

What type of relationship do mycorrhizal fungi have with plants?

  • Mycorrhizae: The Symbiotic Relationship between Fungi and Roots. These conditions are very common; therefore, most plants rely on fungi to facilitate the uptake of minerals from the soil. Mycorrhizae, known as root fungi, form symbiotic associations with plant roots.

Why do scientists refer to this network as the "Wood Wide Web"?

  • Scientists call the fungi the Wood Wide Web because 'adult' trees can share sugars to younger trees, sick trees can send their remaining resources back into the network for others, and they can communicate with each other about dangers like insect infestations.

How do mycorrhizal fungi help plants communicate?

  • Plants communicate via mycorrhizal networks with other plants of the same or different species. Mycorrhizal networks allow for the transfers of signals and cues between plants which influence the behavior of the connected plants by inducing morphological or physiological changes.

In what ways can the network work against certain plants?

  • Since then, scientists have learned that they also help plants locate water and provide certain nutrients through mycelia strands around their roots. The fungal networks protect plants from infection too, by providing protective compounds, stored in the roots, which are triggered should the plant be attacked.

Explanation:

6 0
3 years ago
7. What characteristic of iron would make it a bad material for the housing
lakkis [162]

Answer:

it could not be used because it can attracts the magnets in which compass it self is a form of magnet which can utilize the magnetic properties of the earth to give a reading and Compass housings are often made of either brass, aluminium or plastic.

Explanation:

The characteristic of iron that would make it a bad material for the housing around a compass is that it could not be used because it can attracts the magnets in which compass it self is a form of magnet which can utilize the magnetic properties of the earth to give a reading reason been that Compass housings are often made of either brass, aluminium or plastic

Secondly it would confuse the magnet thereby making it un-useful or useless because the iron can easily become magnetized itself and Iron is a magnetic metal which can cause the needle of a compass to give a false reading thereby messing up the magnet's direction and making it useless.

5 0
3 years ago
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