Question

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1. in a sample of dna, 40% of the nitrogenous bases are adenine. what percentage of the nitrogen bases in the sample are thymine?

a. 20%
b. 30%
c. 40%
d. 60%

1. what percentage of the nitrogen bases in the sample are guanine?

Explanation:

Step1: Apply base pairing rule

Adenine (A) pairs with Thymine (T), so %A = %T. Given %A = 40%, so %T = 40%.

Step2: Calculate remaining base percentage

Total bases = 100%. %A + %T = 40% + 40% = 80%. Remaining: 100% - 80% = 20%.

Step3: Find Guanine percentage

Guanine (G) pairs with Cytosine (C), so %G = %C = 20% / 2 = 10%.

Answer:

1. C. 40%
2. 10%