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Masteriza [31]
3 years ago
14

Looking at your results of the Ames test , using bacteriological agar medium plates lacking the amino acid histidine, you find t

hat there are many colonies growing on the agar. Your interpretation of this result is:
A. The bacterium has turned its operon genes on, producing proteins necessary for growth
B. The chemical being tested is mutagenic
C. The bacterium does not have any plasmids, so it cannot grow on the medium
D. The drug being tested has no inhibitory effect on the bacterium, therefore it is not a good antibiotic to give for treatment of disease
Biology
1 answer:
rodikova [14]3 years ago
8 0

Answer:

B

Explanation:

The Ames test is a bacteriological technique commonly used to determine if a particular chemical or substance can cause mutations. To achieve this, researchers use bacteria (commonly <em>Salmonella typhimurium</em>) as this bacteria strain is unable to grow in a medium that does not contain histidine (a very important amino acid in the biosynthesis of proteins). If the studied substance is able to cause mutations, bacteria will mutate, and they will be able to grow on that particular media even if they don’t have histidine for their metabolism. Therefore, if there are colonies growing, the chemical being tested is mutagenic.  

I hope this clarify your inquiry.  

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The enzyme that performs the light-generating reaction in fireflies is called luciferase. Luciferase is a single polypeptide cha
Mkey [24]

Answer:

The correct answer to the question is: 1) free in the cytoplasm.

Explanation:

  • Ribosomes are responsible for synthesising polypeptide chains by the process of translation from mRNA or messenger Ribonucleic Acid.
  • They are found free in the cytoplasm or remain bound to the Endoplasmic Reticulum (ER) to form the Rough Endoplasmic Reticulum (RER).
  • The cytoplasmic proteins are synthesised by the free ribosomes.
  • The membrane proteins, secretory proteins and the organelle specific proteins are synthesised by the Ribosomes located on the Endoplasmic Reticulum.
  • This is because these proteins need to be translocated to the target organs through vesicles that buds out of the ER and and the Golgi bodies.
  • As the luciferase polypeptide is located in the cytoplasm, it is synthesised by the free ribosomes present in the cytoplasm.

6 0
3 years ago
What is something your body does that keeps it from extreme changes?
UkoKoshka [18]

Answer:

A Rush expert discusses what can happen when your body temperature goes awry, from heatstroke to hot flashes to fever.

Explanation:

hope it helps

8 0
3 years ago
A main sequence star becomes a ____ after it uses up the hydrogen in its core.
Arisa [49]
A main sequence star becomes a GIANT after it uses up the hydrogen in its core.
A giant star is a star with a large radius and luminosity that is much more greater than that of a main sequence star. A giant star is typically formed when a main sequence star deplete its hydrogen gas content. Giant stars usually correspond to the luminosity class ll and lll.
3 0
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An alteration to chromosome structure which only involves one chromosome.
jenyasd209 [6]
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Alterations in chromosomes structures usually leads to mutation. Monosomy refers to the condition of heaving a diploid chromosome complement in which one chromosome lacks its homologous partner.
4 0
3 years ago
A science student makes the following statement.Based on the data, we determined that plant growth is affected by the type of so
gogolik [260]

Answer:

the conclusion

Explanation:

You could find the answer using the steps of scientific experiment

the steps are:  

Get purpose.

build up a hypothesis.

Test the hypothesis and collect data.

Analyze the data.

Draw conclusion.

Communicate results with others

In this case we could see that a student is trying to determine if  plant's growth are affected by the type of soil we use, by seeing the steps of the scientific method, we could say that this is the last step of the experiment. So, it is considered as the conclusion.

3 0
4 years ago
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