0
What growth phase will gram - positive bacteria be most susceptible to penicillin?
Wiki User
∙ 14y ago
Bacteria are most sensitive to antibiotics during the exponential stage (rapid growth).
Wiki User
∙ 7y ago
Add your answer:
Earn +20 pts
Are non-dividing bacteria sensitive to penicillin?
No, it is not. Only dividing bacteria are sensitive to penicillin, as it usually work by either damaging the harmful dividing bacteria's cell membrane or preventing its growth.
Is penicillin a bacteria?
Yes, penicillin prevents the formation of new bacterial cell wall. If a bacteria reproduces, new cell wall cannot be produced and the cell lyses and dies. However penicillin has no effect on a quiescent (non-reproducing) bacteria. Therefore penicillin is also called a bacteriostatic agent (prevents growth of bacteria), which means penicillin does stop bacteria from reproducing.
How does salt concentration effect gram positive bacteria growth?
If the salt concentration is high as in mannitol salt agar 7.5% NaCl, this will inhibit the growth of gram positive bacteria.
What phase is most susceptible to antibiotics?
It is the exponential phase. Many antibiotic such as the Streptogramin family work on the ribosome and indeed the DNA and RNA polymerases. These are most active when the bacteria are dividing and so it causes more harm as it were. Also in Mycobacterium, when dividing it does not have such a thick cell wall, and so it is easier for the antibiotics to penatrate that is true, also known as the Log phase and is when an organism is most sensative to antibiotics like penicillin-
What is the different between bactericidal and bacteriostatic?
BACTERIOCIDE: The agent which kill bacteria is called bacteriocidal it can be done by heat of any chemical. BACTERIOSTATIC: The agent which inhibit the growth and reproduction of bacteria but do not necessasarily kill the bacteria.
Do EMB plate dyes inhibit growth of Gram-positive or negative bac?
The dyes (eosin Y and methylene blue) inhibit the growth of gram- positive bacteria.
Why do antibiotics work against bacteria and not viruses?
Antibiotics disrupt bacterial cell processes that result in either killing the bacteria, preventing it from reproducing, or preventing it from causing symptoms in humans. For example: penicillin disrupts the synthesis of the bacterial cell wall in mostly gram positive bacteria. This prevents the growth of the target bacteria. Any gram negative bacteria will be unaffected by penicillin because they have a different process of synthesizing cell walls that is not disrupted by penicillin. Viruses don't even have a cell wall, they have a protein coat and sometimes an envelope. Neither of these are affected by penicillin. So antibiotics target specific processes that only occur in specific types of bacteria, so each antibiotic will only work on some bacteria and never on viruses. The virus version of antibiotics are called interferon, they disrupt processes that are specific to viruses.
Role of bile salt in macconkey agar?
it inhibits the growth of Gram positive bacteria
What did discovered Alexander Fleming?
Lysozyme and PenicillinHe was the first person to notice that a fungus (Penicillin) inhibited the growth of bacteria. Other people later purified the substance doing this and made the first antibiotic.
What liquids are most susceptible to bacterial growth?
There are quite a few liquids that are susceptible to bacterial growth. Water and sugary warm liquids are the most susceptible.
Which type of bacteria are present in curd either gram plus ve or gram -ve bacteria?
The bacteria present in curd are primarily Gram-positive bacteria. These include species like Lactobacillus acidophilus and Streptococcus thermophilus. Gram-negative bacteria are not typically found in curd as the fermentation process favors the growth of Gram-positive bacteria.
What is a microorganisms that is used to make penicillin?
Penicillin is produced by the Penicillium notatum fungi. Penicillin is one of the earliest discovered and widely used antibiotics. Antibiotics are natural substances that are released by bacteria and fungi into the their environment to inhibit the growth of other microbes, so it is biological warfare on a microscopic scale.
