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【简答题】
麻花钻有哪些刃磨要求?
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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】垂直于W面的直线,称之为()。
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