举一反三
- A rare situation where only one of the two copies of a particular tumor-suppressor gene needs to be inactivated before there is a progression toward cancer is called: A: haploinsufficiency. B: clonal evolution. C: loss of heterozygosity. D: signal transduction. E: aneuploidy.
- Which of the following statements is right? A: RB exerts anti-proliferative effects by controlling the G1-to-S transition of the cell cycle B: RB is a key positive regulator of the cell cycle C: The TP53 was the first tumor suppressor gene to be discovered by the study of retinoblastoma D: Malignant transformation is only derived from one of the normal RB alleles inactivated
- Tumor suppressor genes encode proteins that normally restrain cell division. Mutation in one or more of these genes can lead to tumor formation.
- In about 150 Ma before recent there was only one continent called Pangea,and one ocean called Panthalassa.
- 中国大学MOOC: To become a member of the two major parties in America, one needs to ______________.
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A________ trait is opposed to a recessive trait which is expressed only when two copies of the gene are present. A: determinant B: dormitory C: dominant D: dormant
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Now, families where one parent is an only child could have two children.
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中国大学MOOC: Fill in the blanks in the following statements, and think about the logical relationships it represents. consequentlygenerallywhereas converselyin addition Using only one type would be over simplistic and aimed at one particular group of visitors, ____________ combining two types provide a reasonable amount of information for everybody.
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中国大学MOOC: Walt Whitman wrote only one book, but it took his whole life. What is the book of poetry called? (Week 7)
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中国大学MOOC: There are only two assistants in that shop.