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Zigmanuir [339]
3 years ago
12

People addicted to smokeless tobacco can develop thick, leathery white spots in the mouth. What are these spots called? A. emphy

sema B. leukoplakia C. mouth ulcers
Health
1 answer:
erastova [34]3 years ago
4 0

The correct answer is Leukoplakia.

People with leukoplakia have thickened, white patches that could form on gums, cheeks, and the bottom of someone's mouth.

I hope this helps! :)

Have a wonderful day!

-LizzyIsTheQueen

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In a sample of double-stranded DNA, 19% of the nitrogen bases are guanine(G). What percent of the nitrogenous bases are guaninin
Viefleur [7K]

In a sample of double-stranded DNA, if the nitrogenous base guanine is 19%, then the nitrogenous base adenine will be 31%

Explanation:

In a double-stranded DNA, the four nitrogenous bases bind and pair together. The purine bases guanine (G) and adenine (A) pair with pyramidine bases cytosine (C) and thymine (T) respectively. The pairing will be between G-C and A-T bases.

According to Chargaff’s Rule, the percentage of each nitrogenous base will be equal in a pair. So the percentage of G will be equal to percentage of C and the percentage of A will be equal to percentage of T.  

So if the guanine percentage is 19%, then applying Chargaff’s rule, cytosine will also be 19%

The remaining 68% will be shared with the adenine and thymine pair, of which adenine will be of 31% according to Chargaff’s rule.

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Not sure about the example.

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