下面是两道SAT2生物练习题，是关于environment环境方面的。SAT2生物练习题是大家在备考SAT2生物考试的时候一定要准备的题目，可以借此熟悉和了解相关的SAT2生物词汇和题型等。下面是这两道SAT2生物练习题的详细信息。

　　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.

　　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.

　　以上就是这两道SAT2生物练习题的全部内容，来自SAT考试官方网站，后面附有简单的答案解析和难度提示。大家可以在备考和SAT2生物考试的时候多做一些相关的练习题目，以便更好的掌握SAT2生物考试。

更多SAT2生物相关：

SAT2生物练习题两道 (Biology-M)

SAT2生物核心词汇之血脂和磷脂

SAT2生物备考核心概念之糖

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