下面是两道SAT2生物练习题，是关于分子生物方面的。很多中国考生喜欢选择SAT2生物科目，因为这个科目的大部分知识点大家在高中的时候都学过，所要记忆的新知识比较少，但是即使这样我们也需要练习一些SAT2生物习题，才能掌握SAT2生物考试的特点。

　　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.

　　Nitrogenous base that occurs in RNA but not in DNA

　　Answer Choices

　　(A) Deoxyribose

　　(B) Ribose

　　(C) Uracil

　　(D) Cytosine

　　(E) Thymine

　　The correct answer is C

　　Explanation

　　Difficulty: Easy

　　The correct answer is Uracil. Uracil is one of the four nitrogenous bases found in RNA. The other three nitrogenous bases in RNA are also found in DNA, but uracil is not found in DNA.

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.

　　Sugar that occurs in DNA but not in RNA

　　Answer Choices

　　(A) Deoxyribose

　　(B) Ribose

　　(C) Uracil

　　(D) Cytosine

　　(E) Thymine

　　The correct answer is A

　　Explanation

　　Difficulty: Easy

　　The correct answer is deoxyribose. The name of DNA, deoxyribonucl acid, rers to this sugar, which is found in DNA but not RNA. RNA, or ribonucl acid, contains the sugar ribose instead.

　　以上就是关于SAT2生物练习题的全部内容，来自SAT考试官方网站，后面附有答案和解析，还有难度标示。大家在备考SAT2生物考试的时候，可以根据自己的实际情况选择自己不熟悉的知识点进行更加有针对性的备考复习。

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