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单选题 About _____ of all human cancers contain such dominant, gain-of-function mutations in the Ras gene
学科：Cell Biology 《细胞生物学》一 专业基础课（全英教学）
时间：2023-05-31 12:03:58
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题目1单选题
In meiosis, ____ cell divisions are required after chromosome duplication to produce haploid cellsA. 2B. 3C. 4D. 5
题目2单选题
Even in the animal kingdom, there are species that can procreate without sex. Hydra produce young by ________A. buddingB. matingC. branchingD. rooting
题目3单选题
Duplicated maternal and paternal chromosomes pair during meiosis I to form bivalents. Each bivalent contains _____ sister chromatidsA. 2B. 4C. 6D. 8
题目4单选题
Thanks to this random reassortment of maternal and paternal homologs, an individual could in principle produce 2n genetically different gametes, where n is the haploid number of chromosomes. With 23 chromosomes to choose from, each human, for example, could in theory produce 223—or __________—genetically distinct gametesA. 8.4 × 104B. 8.4 × 105C. 8.4 × 106D. 8.4 × 107
题目5单选题
Patients with albinism type II (an autosomal recessive disorder) have white hair, white skin, and pupils that look pink because a lack of __________ in the eye allows the red color of the hemoglobin in blood vessels in the retina to be visible. This disease is especially frequent among people of black Africans (1:10,000)A. methionineB. melaninC. melatoninD. serotonin
题目6单选题
If two nonalbino individuals with an Aa genotype start a family, each of their children would have a ____ chance of being an albino who harbors the aa genotypeA. 12.5%B. 25%C. 50%D. 100%
题目7单选题
If a homozygous nonalbino man (AA) marries and has children with an albino woman (aa), what is the frequency of albino for their childrenA. 0%B. 25%C. 50%D. 100%
题目8单选题
Marriages between related individuals—called consanguineous—create a greatly increased risk of producing children that are homozygous for a deleterious recessive mutation. In China, the marriage law bans marriage between close relatives, which is defined as lineal relatives, blood relative in the direct line of descent, and collateral relatives, such as cousins or uncles, to the _______ degree of relationshipA. secondB. thirdC. fourthD. fifth
题目9单选题
Mutations that increase the activity of a gene or its product, or result in the gene being expressed in inappropriate circumstances, are called gain-of-function mutations. Such mutations are usually _________A. apparentB. dominantC. profoundD. recessive
题目10单选题
About _____ of all human cancers contain such dominant, gain-of-function mutations in the Ras geneA. 20%B. 30%C. 40%D. 50%
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