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Vikentia [17]
3 years ago
11

Cytosine makes up 42% of the nucleotides in a sample of dna from an organism. Approximately what percentage of the nucleotides i

n this sample will be thymine?
Biology
1 answer:
Vikki [24]3 years ago
4 0

Answer:

8%

Explanation:

DNA is a double-stranded molecule made up of nucleotides: A, T, G, and C. According to Chargaff, A + T + G + C = 100%, where Adenine (A) pairs with Thymine (T) while Guanine (G) pairs with Cytosine (C).

Since G pairs with C and A with T, there must be equal proportions of each nuceleotide pair i.e. A=T, G=C

If C= 42%, G is also 42%

We then have, 42 + 42 + A + T = 100

84 + A + T = 100

A + T = 100 - 84

A + T = 16%

If A and T is collectively 16% and each must contain equal proportion, therefore, A=T = 16/2 = 8%.

Hence, proportion of Adenine and Thymine in that DNA is 8%.

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Explanation: The bark, wood and roots of Acokanthera schimperi are used as an important ingredient of arrow poison in Africa. All plant parts contain acovenoside A and ouabaïne, which are cardiotonic glycosides. Its fruit is edible, and is eaten as a famine food. When ripe they are sweet but also slightly bitter. Unripe fruits have caused accidental poisoning as they are highly toxic.[3]

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3 years ago
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I hope this helps~!

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