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lesya [120]
2 years ago
6

​Which cellular component is common to all cell types?

Biology
1 answer:
Alexus [3.1K]2 years ago
6 0
All cells share four common components: 1) a plasma membrane, an outer covering that separates the cell's interior from its surrounding environment; 2) cytoplasm, consisting of a jelly-like region within the cell in which other cellular components are found; 3) DNA, the genetic material of the cell; and 4) ribosomes, .
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What is the net charge of the structure in the figure below?
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Question:- what is the net charge of the structure in the figure below?

A. 1-

B. 1+

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Answer

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Answer:

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A DNA fragment is introduced into the lacZ gene of a plasmid, which also contains an ampicillin resistance gene. What is the app
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Answer: The bacteria transformed with this particular plasmid will form white colonies on the plates containing ampicillin and Xgal.

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β-galactosidase into 5-bromo-4-chloro-indoxyl which will dimerize and oxidise into 5,5'-dibromo-4,4'dichloro-indigo. This is a blue pigment which will give blue color to the bacterial cells. Introducing a DNA fragment in this lacZ gene will make it non-functional so it will not be able to produce the enzyme.

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This is called blue-white screening which is used to identify successfully transformed host cells. A picture of this is given in the attachment, taken from the following website:

https://www.mun.ca/biology/scarr/Blue_&_White_Colonies.html

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