皮皮学，免费搜题
登录
搜题
【单选题】
哪一个命令能用来查找在文件THSTFILE中只包含四个字符的行?()A.
grep ‘????’TESTFILE
B.
grep ‘.... r’TESTFILE
C.
grep ' ^????$’ TESTFILE
D.
grep’^•••••$’ TESTFILE
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Using the technique of electrophoresis to study sickle cell anemia, Pauling concluded that ( ).
A.
polypeptides carry the genetic information
B.
the sickle cell gene chemically alters the hemoglobin protein
C.
DNA carries the genetic information
D.
the one-gene-one-enzyme hypothesis was incorrect
【单选题】Which type of mutation leads to sickle cell anemia? Choose the one best answer.
A.
Silent
B.
Nonsense
C.
Insertion
D.
Deletion
E.
Missense
【单选题】U s ing the technique of electrophoresis to study sickle cell anemia, Pauling concluded that ( ).
A.
polypeptides carry the genetic information
B.
the sickle cell gene chemically alters the hemoglobin protein
C.
DNA carries the genetic information
D.
the one-gene-one-enzyme hypothesis was in c orrect
E.
none of the above
【单选题】Sickle cell anemia is an autosomal recessive genetic disease with a frequency of _______.
A.
1:500
B.
1:625
C.
1:1,000
D.
1:2,000
【简答题】镰状细胞贫血( sickle cell anemia) :
相关题目：