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【单选题】
神经元的轴突内缺少A.
神经丝
B.
微管
C.
微丝
D.
粗面内质网
E.
线粒体
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反馈参考答案：
举一反三
【单选题】—Do you know _____ for Shanghai last night? —At 9:00. [ ]
A.
what time he leaves
B.
what time does he leave
C.
what time he left
D.
what time did he leave
【单选题】What time does the woman ask the man to come to the office?
A.
At 9:00 on Tuesday.
B.
At 9:00 on Wednesday.
C.
At 10:00 on Wednesday.
【简答题】平面任意力系有____个独立的平衡方程,平面汇交力系有____个独立的平衡方程,平面平行力系有____个独立的平衡方程,平面力偶系有____个独立的平衡方程。
【单选题】What is Cas9 and what does it do?
A.
an RNA molecule that binds to target DNA via complementary base pairing
B.
a DNA sequence that binds the Cas9 protein
C.
a viral protein that disrupts bacterial membranes
D.
a protein enzyme that cuts both strands of DNA at sites specified by an RNA guide
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