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sesenic [268]
3 years ago
11

If we have a plate that has 2500 colonies on it, can we use this plate to calculate CFU's

Biology
1 answer:
AleksAgata [21]3 years ago
6 0

No, the solution with bacteria in it needs to be diluted in order to be in the range of 30 – 300.

A colony-forming unit –CFU is used to estimate the number of viable (ability to divide by binary fission) microbes in a sample.  

A sample of microbes is diluted and spread on a plate. Then, the number of colonies is counted, assuming that each colony have grown from a single colony-forming unit, or CFU.

Plates with more than 300 colonies are difficult to count while those with less than 30 colonies give statistically unreliable numbers of colonies to count.

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Specifically, for cancer treatments, the CRISPR system targets DNA sequence for ____________ , proteins in which the genes have
SVEN [57.7K]

The CRISPR system targets DNA sequences for precisely cutting DNA and then letting natural DNA repair processes take over.

<h3>What is the CRISPR system?</h3>

CRISPR/Cas9 edits genes by accurately slicing DNA, which is then repaired by the body's mechanisms. The Cas9 enzyme and a guide RNA make up the system's two components. CRISPR stands for Clustered Regularly Interspaced Short Palindromic Repeats, which some bacterial species use as a component of their antiviral defenses. Co-founder Dr. Emmanuelle Charpentier and a team of researchers figured out how to employ this technology as a gene-editing tool (Jinek, et al. Science 2012) An enzyme known as a CRISPR-associated (Cas) endonuclease that functions as a "molecular scissors" to cut DNA where a guide specifies RNA. Deoxyribonucleic acid (DNA) is the genetic informational molecule that most organisms use to store the "instructions for life". Living beings employ ribonucleic acid (RNA), a molecule related to DNA, for a variety of tasks, including carrying and reading the DNA "instructions." RNA molecules known as "guide RNA" (gRNA) attach to Cas9.  

Learn more about the CRISPR system here:

brainly.com/question/24881426

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8 0
2 years ago
An atom contains one proton, one electron, and one neutron. Which two particles are most similar in mass?
podryga [215]

Answer:

the proton and the neutron

Explanation:

An atom is made up of subatomic particles; neutrons, protons and electrons. The protons are positively charged subatomic particles found in the nucleus with a mass equal to 1.6 \times 10^{-27} kg.  The electrons are negatively charged particles of an atom found in the orbital shells in constant motion. They have a mass equal to 9.1 \times 10^{-31} kg.  The neutrons are particles found in the nucleus that have no charge and have a mass equal to 1.6 \times 10^{-27} kg. therefore protons and neutrons are similar in mass.

5 0
4 years ago
Read 2 more answers
A population of frogs inhabits a lake. If the resource availability of the lake changes, the population may to use the resources
cestrela7 [59]

The population of frogs would exhibit competition due to the limited resources in the lake. Competition can be defined as the interaction among the species of organisms when resources are limited in an ecosystem. The type of competition observed in the above example of the lake with limited resources is called intraspecific competition as it is between the members of the same species competiting for the same resources. The species that do not compete will eventually die or get eliminated. This results in the change of population of frogs over time. Thus, competition is one among the forces that is responsible for natural selection.

4 0
4 years ago
The four organic molecules are listed below. Which ones do you get from the foods you eat? Check all that apply. Carbohydrate Nu
drek231 [11]

All of the above

Carbohydrates-breads

Lipids-avocados,dark chocolate and cheese

proteins-Eggs,pumpkin seeds,oats

Nucleic acids-shrimp,milk

3 0
4 years ago
Please help!!
borishaifa [10]

Answer:

Bone marrow, amniotic fluid, and brain

Explanation:

In the choices, I notice that liver is also a part of Adult stem cells but so are the ones I mentioned.

Adult stem cells are found in small numbers in most adult tissues. To not get confused by embryonic stem cell, adult stem cells are there to replace dead cells throughout the growing process of a human which is also called somatic stem cells but this type of cells helps with the brain, bone and fluid

Hope this helped :)

 

5 0
3 years ago
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