题目内容
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A、the distance in numbers of nucleotides between two genes
B、the number of genes on each of the chromosomes of a species
C、the linear order of genes on a chromosome
D、the location of chromosomes in the nucleus when they line up at metaphase during mitosis
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更多“A genetic map shows which of t…”相关的问题
A、The current yield is defined as the yearly coupon payment divided by the price of the security.
B、The current yield and the yield to maturity always move together.
C、The formula for the current yield is identical to the formula describing the yield to maturity for a discount bond.
D、All of the above are true.
E、Only (a) and (b) of the above are true.
| 阅读理解。 |
| Whatever our differences as human beings are we all think we're more like the rest of the animal world than we realize. It is said that we share 40 percent of our genetic (遗传的) structure with the simple worm. But that fact has helped Sir John Sulston win the 2002 Nobel Prize for Medicine. Sir John is the founder of the Sanger Institute in Cambridge, which was set up in 1992 to get further understanding of the human genome (染色体组). To help them do this, they turned to the worm. The nematode (线虫类的) worm is one of the earliest creatures on planet earth. It is less than one millimeter long, completely transparent and spends its entire life digging holes through sand. But it still has lots to say about human life, and what can be done to make it better. What the worm told Sir John and his colleagues was that each of the cells in the human body is programmed like a computer. They grow, develop and die according to a set of instructions that are coded in our genetic make-up. Many of the diseases that humans suffer from happen when these instructions go wrong or are not obeyed. When the cell refuses to die but carries on growing instead, this leads to cancer. Heart attacks and diseases like AIDS cause more cell deaths than normal, increasing the damagetheydo to the body. Sir John was the first scientist to prove the existence of programmed cell death. |
| 1. Sir John Sulston got a Nobel Prize for Medicine because he has _____ . |
| A. found that human beings are similar to the worm B. got the fact we share 40 percent of our genetic structure with the simple worm C. found the computer which controls each of the cells in the human body D. proved that cell death is programmed |
| 2. People might be seriously ill if the cells in their body _____. |
| A. grow without being instructed B. die regularly C. fail to follow people's instructions D. develop in the human body |
| 3. The underlined word " they" in Paragraph 5 refers to _____. |
| A. cell deaths B. diseases C. instructions D. cells |
| 4. What is the subject discussed in the text？ |
| A. The theory of programmed cell deaths. B. A great scientist-Sir John Sulston. C. The programmed human life. D. Dangerous diseases. |
A、deletion
B、duplication
C、inversion
D、translocation
E、transition
A、two genes are assorting independently.
B、two genes are far apart on a genetic map.
C、one crossover inhibits another.
D、the number of recombinant progeny classes in the testcross of a heterozygote exceeds the number of parental progeny.
E、a crossover causes the termination of the meiosis event in which the crossover is occurring.
A、any; individual
B、a genetic; individual
C、any; group of organisms
D、a genetic; group of organisms
A、autotrophs.
B、heterotrophs.
C、prototrophs.
D、omnitrophs.
E、auxotrophs.
A、a loss of an AT base pair from a gene
B、the addition of methyl groups to cytosines in the promoter region of a gene
C、the substitution of an AT base pair by a GC base pair in a gene as a result of a mistake during DNA replication
D、a deletion that simultaneously removes two genes from the genome
E、None of these examples represents epigenetic changes.
A、the plant Linaria vulgaris
B、the deer mouse Peromyscus maniculatus
C、the worm Caenorhabditis elegans
D、the frog Hyla chrysoscelis
E、the chimpanzee Pan troglodytes
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