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Subject Test Biology

Question 3 of 24

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SAT Subject Test

The first items in the Biology E/M test are arranged in sets with common answer choices. These items appear in the core section of the test. Remember, these are not MATCHING challenges — each answer choice can be used once, more than once, or not at all.

A nitrogenous base that occurs in DNA in equal quantities with guanine

Select an Answer

Deoxyribose

Correct Answer: 
No

Ribose

Correct Answer: 
No

Uracil

Correct Answer: 
No

Cytosine

Correct Answer: 
Yes

Thymine

Correct Answer: 
No

The correct answer is cytosine. The only base that is always found in equal quantities with guanine is its complement, cytosine (recall that the nitrogenous bases in DNA pair, A with T and C with G.)

Question Difficulty: 
easy