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【多选题】
下列关于钙的叙述中正确的是A.
钙是常量元素
B.
钙是人体中含量最多的矿物质
C.
钙存在于血液中
D.
缺钙会产生抽搐、惊厥等现象
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【单选题】??According to the fifth paragraph,which of the following about bees' genes is true???
A.
Bees' genes allow them to expand their colonies
B.
Bees'genes help keep them in their hives
C.
BeeS'genes make them fly from flower to flower
D.
Bees'genes could explain the collapse of some colonies
【单选题】According to the fifth paragraph，which of the following about bees’ genes is true?
A.
Bees’genes allow them to expand their colonies．
B.
Bees genes help keep them in their hives．
C.
Bees genes make them by from flowers to flower．
D.
Bees genes could explain the collapse of some colonies．
【单选题】Which statement is not correct about constitutive genes?
A.
The expressive products of constitutive genes are absolutely necessary in all over life process.
B.
The expression of constitutive genes is much affected by environment factors.
C.
The constitutive gene expression is only effected by interacting between promoter and RNA polymerase.
D.
Constitutive gene expression is continual in most cells.
【单选题】Which of the following would be the best title for this text?
A.
Genes, the Secret of Longevity
B.
Environment and Genes
C.
Lifestyle. and Genes
D.
Genes May Predict Who Lives to 100
【单选题】Which of the following statements about homeotic genes is INCORRECT?
A.
Homeotic genes were first identified in invertebrates, but their homologs were found in almost all organisms.
B.
All homeotic genes contain consensus sequences that result in a specific DNA-binding motif.
C.
In vertebrates, homeotic genes are organized into two distinct clusters.
D.
All homeotic genes encode transcription factors that direct further gene expression.
E.
Homeotic genes exhibit a relationship between their order on the chromosome and the timing of their expression.
【简答题】简述循序渐进原则的贯彻要求。
【简答题】简述循序渐进原则及其贯彻的基本要求。
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