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【判断题】
存储虚拟化就是在寻出设备之上部署逻辑层,通过逻辑层对存储资源进行控制。A.
正确
B.
错误
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举一反三
【单选题】The protein whose structural change can cause sickle cell anemia is
A.
lactate dehydrogenase
B.
pyruvate kinase
C.
insulin
D.
myoglobin
E.
hemoglobin
【单选题】Which of the following statements about sickle cell anemia is wrong?
A.
Sickle cell anemia occurs in individuals who inherit the allele for sickle cell hemoglobin from both parents. The erythrocytes of these individuals are fewer and also abnormal.
B.
In addition to an unusually large number of immature cells, the blood contains many long, thin, sickle-shaped erythrocytes. When hemoglobin from sickle cells (called hemoglobin S, or HbS) is deoxygenated, it becomes soluble and forms polymers that aggregate into tubular fibers. The insoluble fibers of deoxygenated HbS cause the deformed, sickle shape of the erythrocytes, and the proportion of sickled cells increases greatly as blood is deoxygenated.
C.
The altered properties of HbS result from a single amino acid substitution, a Val instead of a Glu residue at position 6 in the two β chains. The R group of valine has no electric charge, whereas glutamate has a negative charge at pH 7.4. Hemoglobin S therefore has two fewer negative charges than HbA (one fewer on each β chain).
D.
Replacement of the Glu residue by Val creates a “sticky” hydrophobic contact point at position 6 of the β chain, which is on the outer suce of the molecule. These sticky spots cause deoxyHbS molecules to associate abnormally with each other, forming the long, fibrous aggregates characteristic of this disorder.
【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
【简答题】镰状细胞贫血( sickle cell anemia) :
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