How do you think changing the temperature at which the bags were incubated affected the results?

Q: Dr. Riggs took 1ml of whole mouse blood and added it to 10ml of PBS. You next take 0.5 mL of Dr.…

A: The first step is to calculate the average number of cells counted in the hemacytometer. The counts…

Q: A glass flask is rinsed and autoclaved after use. It was then filled with sterile media in a sterile…

A: Introduction Microbes or microorganisms may be found on almost every surface, in the air we breathe,…

Q: Who invented penicillin?

A: Penicillin is a group of antibiotics, derived originally from common molds known as Penicillum…

Q: How would you prepare a 1:500 dilution? You cannot use more than 10mL per tube.

A: In scientific research and experimentation, it is often necessary to dilute substances to achieve…

Q: Two different bacterial samples, A and B, were inoculated onto SIM media. What can you conclude…

A: SIM (Sulfide, Indole and Motility) test is done to differentiate the Gram negative bacilli based on…

Q: What is the proper collection time period for a fecal fat specimen? 1) 24 hours 2) 48 hours 3) 72…

A: Fecal lipids come from four different places. They are lipids that are consumed but are not…

Q: In a plate count, 1 mL of culture is spread on a plate and incubated for 24 hours. 250 colonies are…

A: Given,number of colonies in a 1mL of culture = 250. Also,given that this given solution is 100 times…

Q: You make a 1:100 dilution of your culture and plated 0.1 ml of this sample on a Nutrient agar plate.…

A: The amount of organisms present in the original culture is called as colony forming unit per…

Q: What was one benefit of the vaccine produced by the command economy?

A: Command economy is also called as a planned economy, where the government controls all the economic…

Q: What is the difference between Benedict and Barfoid's test?

A: Both Barfoeds and Benedict’s solution are made from same ingredients. But their capabilities are…

Q: If the test method used in the laboratory varied from the specification, how will  it affect the…

A:

Q: what does it mean if a bacteria tested negative for H2S

A: Hydrogen sulfide test  H2S  or Hydrogen sulfide is produced during metabolism of sulfur containing…

Q: Give two ways to prevent the diffusion of oxygen into the medium in this test.

A: The main two ways to prevent the diffusion of oxygen are given below.

Q: What do you mean by ultrafiltration?

A: The excretory system is the system that performs excretion, the bodily process of discharging…

Q: Where did evidence of SRY come from?

A: SRY is a gene which is found on chromosome Y. It is male sex determination factor in  Human beings.

Q: -Two hundred patients without chest pain were screened with a new biochemical test that showed 190…

A: A screening test is important in the diagnosis of any disease at the initial stage. In some cases,…

Q: What do you mean by Immunoelectron Microscopy?

A: Microscope is an analytical instrument which is used to analyse, study and visualize internal…

Q: What is the purpose for testing a specimen for hydrogen sulfide production?

A: Hydrogen sulfide is produced when a bacterial strain reduces the sulfur compounds.  The specimens…

Q: Which of the following methods should NOT be used to thaw frozen meats? a) refrigerator thawing b)…

A: Thawing is the process of taking a frozen product from frozen to a temperature (usually above 0°C)…

Q: How can you collect a fecal sample from a patient for lab testing.

A: Specimen collection is the common step of every diagnosis. Care is taken while collecting the…

Q: When viewed under a microscope, bacteria appear as red rods after they have been stained. Explain a…

A: Introduction Bacteria Are Minute, Single-celled Organisms That Can Be Found In Large Numbers In All…

Q: How many types of catheters are there

A: A catheter is a thin tube that is inserted into to the body for surgical procedures. This process is…

Q: thanol has been carried over into your DNA sample (two answers possible here, select both of them)…

A: DNA is not soluble in ethanol . But when ethanol is there DNA gets separated by forming white…

Q: What does the presence of gas in the Durham tubes for the presumptive test indicate?

A: Presumptive test : it is a test to identify bacteria from the large soil, water medium.  It is known…

Q: Why can't you see the bacteria when you first swab a plate

A: Bacteria are one-celled organisms that make up a vast group. They can dwell in a variety of…

Q: What is a better alternative to the plate count method?

A: The plate count method is used to know the number of bacteria in any sample. It is practiced in…

Q: When the plates are placed inside the incubator, they are only loosely covered without sealing…

A: Introduction :- A device called an incubator is used to cultivate and preserve cell or…

Q: Attached below is the study about the effects of handwashing and the effectiveness of soap against…

A: We only become aware of the significance of handwashing during pandemics. However, its advantages…

Q: Why is it a mistake to use the same syringe, even with new , sterile needles?

A: Contamination is the presence of any impurity, constituent, or any unwanted element that can infect,…

Q: Why are petri dishes ALWAYS stored and incubated upside down?   Question 17 options:   a)  helps…

A: ANSWER) Petri dish is a transparent dish which is shallow and is used with the purpose of holding…

Q: If you were working with Drs. Joseph Warren and Barry J. Marshall to design a study to determine…

A: Discoveries in the scientific world are replete with examples of Chance or accidental discoveries,…

Q: What method did Coghill suggest to produce penicillin?.

A: A number of diseases can be managed and treated using penicillin. It is a kind of antibiotic known…

Q: You perform a nitrate test. After adding solutions A and B, the broth remains colorless. Why should…

A: Nitrate test helps us to determine the production of nitrate reductase enzyme. By the activity of…

Q: If a component is heat sensitive, how might you conveniently achieve sterility of that medium? a.…

A: Option A i.e. filtration

Q: Can hand sanitizer kill bacteria?

A: Sanitizer is referred to as any substance or fluid that is used to prevent the spread of pathogens…

Q: Before the experiment was run, the apparatus was sterilized and then carefully sealed. Why was this…

A: Sterilization can be classified into physical and chemical methods. Physical methods include the use…

Q: What biochemical tests did we use to distinguish staphylococci from streptococci?

A: Staphylococcus and streptococcus both occur in cocci shape and both are gram positive organisms.…

Q: How did the observable colonies on each agar plate differ in size, color, and morphology for each of…

A: Size:The size of microbial colonies can vary widely depending on several factors:Growth rate: Some…

Q: How many bacteria would be in 1ml of the sample if you counted 134 colonies on the 1:1,000 dilution?

A:

Q: What is the nature of samples that should NOT be placed inside the drying-oven?

A: According to the question, we have to explain the nature of the samples that should not be placed…

Q: Śwabbing means pulling fluid from the hole on the way out with the test tool could cause a kick,…

A: Swabbing is considered as the technique to clean or to apply medication. It can be used to collect…

Nutrient Growth Medium

It is a culture medium or nutrient broth for all kinds of microorganisms to grow properly and create their colony. This matrix provides support to increase the population of microbes through the method of cell proliferation. It is regarded as the food material for those organisms. It is a type of in vitro mechanism, in which the development of life is processed outside the host body. It can be solid, semi-solid, or liquid in nature. Different kinds of cells develop in different types of media.