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Bacteria

Bacteria are a large domain of single-celled, prokaryote microorganisms. Typically a few micrometres in length, bacteria have a wide range of shapes, ranging from spheres to rods and spirals.

2,228 Questions

What are the names of undesirable bacteria?

Campylobacter jejuni, clostridium botulinum, clostridium perfringens, escherichia coli 0157: H7, listeria monocytogenes, samonella enteretedis, samonella ytphimurium, shigella, staphylococcus aureus, vibrio cholerae, vibiovulnificus, yersinia enterococitica. sorry if some aren't spelled right. they also should have the first word capitalized. hope this helped!

What are the 3 ways in which we classify bacteria be able to identify bacteria using these traits?

main shapes of bacteria

1)Spherical: circular

2)Triangular: bent and curved in three places

3) Retangular: they have a "boxy" shape

i thought the first answer was wrong so heres the ones from my notes.

Main Shapes of Bacteria

1)Rod shaped (Bacilli)

2)Sphere shaped (Cocci)

3)Spiral shaped (Spirilla)

What type of symbiotic a bacteria living in the testine of a cow to help it break down cellulose?

Yes! (is there more you need for this question?)

"Symbiotic anaerobic bacteria"

Cellulomonas is one such example.

Do all types of bacteria Give food poisoning?

One type of food poisoning is Botulism. Botulism is serious food poisoning that is very rare in the US. The toxin enters the nerve cells and blocks transmissions so that muscles become weak. Botulism IS NOT contagious.

Where can you find Streptococcus pyogenes?

staph exists on the skin or inside the nostrils of 20-30% of healthy people. It is sometimes found in breast tissue, the mouth, and the genital, urinary, and upper respiratory tracts. staph bacteria are usually harmless.

What factor in addition to oxygen might influence the growth of different types of bacteria?

It depends--there are both aerobic (oxygen-dependent or oxygen-tolerating) and anaerobic (oxygen-intolerant) bacteria. Anaerobic bacteria often cannot live in the presence of oxygen, while increasing oxygen levels for aerobic bacteria can often stimulate population growth.

HOW DOES BACTERIA EFFECTS THE ENVIRONMENT?

Bacteria are essential to almost all life that is not a primary producer at the base of the food chain. For example, bacteria are essential to complete digestion in the gut of many animals, including humans. Bacteria break down dead organic matter in the ecosystem. So-called "good" bacteria act as beneficial symbionts to almost all animals by filling a variety of roles, including protection against harmful bacteria.

How does the bacteria reproduce itself in the dijestive system?

A small number of the bacteria on meat can cause food poisoning.These bacteria enter the body and reproduce by dividing in the same way as cell in the body.Each bacterium can divide every 20 minutes.

When do bacteria release toxins in the food?

It depends on the toxin. Exotoxins are a toxin that is released by bacteria into the surrounding environment. These would be released as a defense mechanism and would not be found in the cooking of food. Endotoxins, which is considered to be a toxin kept "within" the bacterial cell and released only after destruction of the bacterial cell wall. Such as when cooking.

How does temperature affect bacterial growth?

Most microbes, such as bacteria and yeast, have an optimal temperature range in which they grow best. If you get either too low or too high then they grow much slower and finally cease growing at all. However this temperature range can vary with different organisms. The main reason is the ability of the enzymes that catalyze all the biochemical reactions in the yeast cell to function at those temperatures. Enzymes have an optimal temperature range. When you get below that range there ability to catalyze the intended reaction really slows down. Above that temperature and the enzyme begins to denature or unfold and becomes inactive. Each enzyme will have a different range where it becomes inactive. (this probably all sounds really confusing but it can be help full for last minute revision, it also tends to impress teachers too!)xxx

How does bacteria get energy without sunlight?

Bacteria living in deep-sea communities obtain their energy from chemical sources, rather than from sunlight. They use hydrogen sulfide molecules that are clustered around deep-sea hydrothermal vents as their food sources.

Is bacteria heterotrophic or atuotrophic?

Most bacteria are heterotrophs (like us.) Heterotrophs must get their food from another source (such as in our gut or on our skin.) Some bacteria are autotrophs, which means they make their own food from performing either photosynthesis (using the sun) or chemosynthesis (using inorganic compounds.)

Are humans the most abundant organisms on Earth?

No, humans are not the most abundant organisms on Earth. Microorganisms such as bacteria and archaea are the most abundant and diverse organisms on the planet. Humans make up only a small portion of the total biomass on Earth.

How do bacteria exchange ganetic information?

Bacteria change genetic information with each through conjugation.

Is milk made from bacteria?

If you are talking about cow's milk, then I suppose yes it is in a very roundabout way.

First of all understand that milk is made by the mother animal out of her own body tissues. Milk is a modified form of "sweat" produced by modified sweat glands.

However to produce milk the mother animal has to eat food, in the case of human milk the mother just eats more human food and drinks water and the body turn this into the raw material needed to produce the rich breast milk needed to feed her baby.

With cows, although they eat grass, they can not digest this grass because it is made of "cellulose". They have special stomachs in which the chewed up grass is fermented by bacteria that live naturally in these stomachs and the bacteria break down and grow on the cellulose. The cow then "digests" these bacteria as its food.

Thus in the case of ruminants, the food the mother cow lives on is bacteria and thus the milk was indeed originally bacteria.

Why do you grow bacteria on agar jelly?

Put agar jelly in a petri dish to sterilize the dish and then use something like a sterile inoculating loop to put the bacteria on the jelly. Then, seal the petri dish but make sure it is not airtight.

What would happen if the bacteria in the large intestine were killed?

The bacteria generally recover. One of the newly-discovered uses of the appendix is holding beneficial bacteria . . . after a bout of diarrhoea, these bacteria make it out of the appendix and into the intestines.

How do you tell if food is contaminated with food poisoning bacteria?

You used to know that canned food was probably infected with botulism because the can looked like it was overinflated, but there have been very few if any reported cases of botulism-infected canned goods for a while thanks to dilligent pasteurization practices. Enough bad bacteria to make you sick will usually not be visible, nor will it have a discernable smell or taste. Always assume that raw meat, especially chicken and pork, is loaded with it. Make sure it never touches anything that will touch other foods, and after handling raw meat always thoroughly wash you hands before touching anything else. Never eat chicken that has not been heated to at least 165° F all the way through or pork that has not been heated to 195° F all the way through. Above all else, always remember: WHEN IN DOUBT, THROW IT OUT!

How would you define habitat of bacteria?

The habibtat of bacteria are that they are onmi-present and they can be found from the coldest region on earth to the hottest region on earth. They can also be found inside our body and also inside animals body.

What are types of bacteria that live in Antarctica?

Generally, bacteria requires a host in order to multiply and remain viable. However, there are endospores that can remain viable for millions of years withstanding the freezing environment.

Dormant bacteria are extremely difficult to identify.

However, in recent years, as scientists have drilled access to sub-glacial lakes -- Lake Vostok and Lake Whillins -- bacteria have been found. As of February 2013, scientists were analyzing the DNA of these organisms to determine their identity.

It is possible that these organisms have never been seen before on earth.

What's interesting to learn is that these sub-glacial lakes are liquid, possibly because of their proximity to the molten core of the earth.

What makes bacteria grow faster?

Some bacteria are autotrophs. This means they produce their own food, allowing them to grow on their own terms. As well, bacteria grow by binary fission, whereas fungi have to grow by either branching and elongating, or budding, which takes longer.

Can bacteria kill other bacteria?

Yes. If you have ever been on Anti-biodics, then you should know. The medicine you take kills all bacteria (even the good ones). You take more medicine to replace the good bacteria. This medicine is called A-biotics.

What are two ways that bacteria can affect plants?

Bacteria and plants are part of the ecosystem.

Bacteria may affect plants in a number of ways. Diseases have been mentioned, but most bacteria co-exist with plants quite easily. Several bacteria are involved with the transitions of nutrients and make nutrients such as nitrogen plant available (the plant is only able to absorb some nutrients in certain molecular forms). While other bacteria convert nutrients and toxins into forms unavailable to the plant.

Other bacteria make Some bacteria, Rhizobia in particular, develop symbiotic relationships with some plants. Rhizobia convert atmospheric nitrogen into ammonium which is plant available. In exchange, the plant provides Rhizobia with shelter (a root nodule) and food (photosynthates).

That should give you a couple of pathways to discuss.