单选题从酵母中克隆到一段DNA序列具有类似原核生物DNA复制起始点的功能，即______。
A．USR(Upstream Replicating Sequence) B．LTR(Long Terminal Sequence)
C．ARS(Autonomously Replicating Sequence)D．ORF(Open Reading Frame)

【正确答案】 C

【答案解析】[考点]相关名词的英文全称和简写。USR(Upstream Replicating Sequence)上游复制序列；LTR(Long Terminal Sequence)长末端重复序列；ARS(Autonomously Replicating Sequence)自主复制序列；ORF(Open Reading Frame)可译框架或可读框。