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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

Does Raw carrots support bacteria growth?

Raw carrots do not support bacteria growth to the same extent as other foods due to their low moisture content and relatively high acidity. However, like any other fresh produce, they can still harbor bacteria if not properly handled and stored. It is important to wash and store carrots correctly to minimize the risk of bacterial contamination.

Can Bacteria secrete toxic substances that damage human tissues?

Yes, some bacteria can produce and release toxins that are harmful to human cells and tissues. These toxins can cause damage by disrupting normal cellular functions, leading to various health issues and diseases. Examples of bacteria that produce toxins harmful to humans include Clostridium botulinum (causes botulism) and Escherichia coli (can produce Shiga toxin).

What reagent detects catalase?

Hydrogen peroxide (H2O2) is commonly used to detect the presence of catalase enzyme in biological samples. When catalase is present, it breaks down hydrogen peroxide into water and oxygen gas, producing bubbles as a result.

How you do know that bacteria are alive?

Bacteria are alive as: 1-they have tails and they move about here and there.

2-They have an ability to reproduce them selves.

3-They multiply very fast______ a single bacterium breaks itself into two every half hour.

Is microbiology bacteria?

Microbiology is the study of microorganisms, which includes bacteria, viruses, fungi, and parasites. Bacteria are one type of microorganism studied in microbiology, but the field encompasses a broader range of microscopic life forms.

Can you use Purell as deodorant since BO comes from bacteria?

Purell is not meant to be used as a deodorant. While it may temporarily reduce bacteria, it is not designed for the skin and can cause irritation or dryness. It's best to use a product specifically formulated for deodorizing and controlling body odor.

Why is it you should heat-fixing the air-dried before staining?

It is used to fix because to make the cell inactive or immoblie, but the main purpose is to fix the smear so that when we put stain and then flush it out with water ( or some time with alcohol) the smear should not wash out with dye.

Which cells do not have a well-defined nucleus have a thick cell wall and ribosomes?

Prokaryotic cells, such as bacteria, do not have a well-defined nucleus, but instead have a nucleoid region where the genetic material is located. They also have a thick cell wall for protection and ribosomes for protein synthesis.

Which wastewater treatment process produces BOD-containing effluent used for irrigation?

The secondary treatment process produces effluent with BOD (biochemical oxygen demand) that can be used for irrigation. This process involves using biological organisms to break down organic matter in the wastewater, reducing the BOD levels to acceptable limits for irrigation.

What are the examples of mycoplasma?

Mycoplasma pneumoniae is a common example of a mycoplasma species that can cause respiratory infections in humans. Mycoplasma genitalium is another species that is associated with sexually transmitted infections. Mycoplasma hominis is a species found in the genital tract that can cause infections in humans.

Can ignoring the signs of a wound infection cause bacteria to become drug resistant?

Yes, ignoring signs of a wound infection can allow bacteria to proliferate, potentially leading to the development of drug resistance. When antibiotics are not used appropriately, bacteria may adapt and develop resistance mechanisms, making them more difficult to treat in the future. Prompt recognition and treatment of infections are important to prevent the emergence of drug-resistant bacteria.

If bacteria used in an experiment - were kept at a temperature of 100 degree Celsius - would you expect the population sizes to increase even faster than at 15 degree Celsius?

No, bacteria generally thrive at moderate temperatures that fall within their optimal growth range. A temperature of 100 degrees Celsius would likely be too high and could lead to cell damage or death, inhibiting bacterial growth. Population sizes would not increase faster at this extreme temperature compared to 15 degrees Celsius.

What effects come from bacteria in your blood.?

Bacteria in the blood, known as bacteremia, can lead to sepsis, an extreme immune response that can cause organ failure, shock, and even death. Sepsis requires immediate medical attention and treatment with antibiotics. Detection and treatment of bacteremia are crucial in preventing severe complications.

What kind of bacteria are commonly found on your kitchen floor?

Staph and salmonella are commonly found on the kitchen floor. Salmonella is especially common, because of the likelihood of raw meat in the kitchen. An antibacterial kitchen spray such as Lysol is necessary to destroy kitchen bacteria.

Why prevention in formation of bubbles in agar plate preparation?

Preventing the formation of bubbles during agar plate preparation is important because bubbles can create uneven spreading of bacteria or other samples on the plate surface, leading to inaccurate results. Bubbles can also trap air, interfering with the growth of microorganisms. To prevent bubbles, it's essential to pour the agar gently, allow it to cool slightly before pouring, and avoid vigorous swirling or shaking of the agar.

Is staphylococcus saprophytic is a harmfully bacteria?

No, Staphylococcus saprophyticus is typically considered to be a low virulence bacterium, meaning it is less harmful compared to other Staphylococcus species. It is commonly found on human skin and mucous membranes, and can occasionally cause urinary tract infections in young women.

Why are disinfectants alone not enough to kill all types of bacteria?

Disinfectants may not be effective against all types of bacteria because some bacteria have developed resistance mechanisms or protective barriers that make them more difficult to kill. Additionally, some bacteria may be able to form biofilms that act as protective shields, making them harder to eliminate with disinfectants alone. Different disinfectants may also have varying levels of effectiveness against different types of bacteria.

How many bacteria are in a single drop of sea water?

There can be millions to billions of bacteria in a single drop of seawater, depending on the location and conditions of the water. Bacteria are essential components of marine ecosystems, playing a key role in nutrient cycling and overall ecosystem health.

What type of bacteria causes diphtheria?

The bacteria know as bacterium Corynebacterium diphtheriae cause diphtheria.

Why use gram iodine in stool examination?

Gram iodine serves as a mordant in stool examination to enhance the visualization of bacterial structures. It helps bind the crystal violet stain to the peptidoglycan layer of bacterial cell walls, making them more easily distinguishable under the microscope. This aids in identifying and characterizing different bacteria present in the stool sample.

Are bacteria and viruses surrounded by a protein coat?

Viruses are surrounded by a protein coat called a capsid, which protects their genetic material. Some bacteria have an outer protein coat called a capsule, which provides protection and helps them adhere to surfaces.

Can a bacteria live without its host?

It depends on the kind of Bacteria you are talking about. Most do not depend on a host and live on their own. Some, such as E. coli can live outside a host at least for some time. A few are entirely dependent on a host.

How would you describe a bacteria that is pathogenic?

A pathogenic bacteria is capable of causing disease in its host organism by invading tissues and compromising the host's immune response. It can produce toxins or release harmful enzymes that contribute to the development of illness or infection.

Is helicobacter pylori is normal flora of human stomach?

No, Helicobacter pylori is not considered part of the normal flora of the human stomach. It is a type of bacteria that can colonize the stomach lining and is associated with various gastrointestinal conditions like gastritis and ulcers.

What substance in sebum kill bacteria?

Fatty acids present in sebum have antimicrobial properties that can help kill bacteria on the skin's surface. These fatty acids help to maintain the skin's natural microbiome and protect against harmful pathogens.