2020 医用发育生物学CNU(重庆师范大学)1453168463 最新满分章节测试答案

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本课程起止时间为:2020-02-24到2020-06-30

第二章 基本概念 第二章测试

1、 问题:Which of the following is a germ cell?
选项：
A:cells of the gonads
B:intestinal cells
C:sperm and eggs
D:zygotes
答案: 【sperm and eggs】

2、 问题:Which of the following basic developmental processes is most dependent on cellular movements?
选项：
A:cell differentiation
B:growth
C:morphogenesis
D:pattern formation
答案: 【morphogenesis】

3、 问题:A morphogen is
选项：
A:a cell or group of cells that signal other cells to become determined in a specific way
B:a gene that causes a cell or group of cells to adopt a particular shape
C:a signaling molecule that causes the differentiation of neighboring cells
D:a signaling molecule that confers concentration-dependent positional information
答案: 【a signaling molecule that confers concentration-dependent positional information】

4、 问题:What distinguishes stem cells from other cell types?
选项：
A:Although all cell types can divide, only stem cells differentiate after division.
B:Stem cells are able to divide to produce populations of cells that differentiate into a related set of cells.
C:Stem cells divide asymmetrically to give rise to one daughter cell that remains a stem cell, and a second daughter cell that differentiates into one or more cell types.
D:Stem cells have a special type of cell division in which they form small stems that then pinch off to give rise to the daughter cell.
答案: 【Stem cells divide asymmetrically to give rise to one daughter cell that remains a stem cell, and a second daughter cell that differentiates into one or more cell types.】

【作业】第二章 基本概念 第二章作业

1、 问题:The Greek philosopher Aristotle considered two opposing theories for development: preformation and epigenesis. Describe what is meant by these two ideas.
评分规则: 【 先成论包括古典先成论和改良先成论：古典先成论：胚胎中的一切都是从一开始就形成的，仅在发育过程中逐渐长大；改良先成论：除遗传子外，没有其它任何东西。后成论：胚胎中的新结构是逐渐形成的。现代细胞生物学奠定了“后成论”的基础：生殖细胞和胚胎细胞的相互作用，包括直接接触和信号传递，通过调控基因的差异化表达，调控了了细胞增殖、迁移、分化，导致了细胞的差别分化。
】

第三章 脊椎动物生命周期和发育概要 第三章测试

1、 问题:Which of the following is a vertebrate ‘model organism’ used in the study of development?
选项：
A:Drosophila melanogaster
B:Homo sapiens
C:Caenorhabditis elegans
D:Xenopus laevis
答案: 【Xenopus laevis】

2、 问题:The nervous system, heart, and liver are derived from (   ), (   ), and (    ), respectively.
选项：
A:all are derived from mesoderm
B:ectoderm, mesoderm, and endoderm
C:endoderm, mesoderm, and ectoderm
D:mesoderm, ectoderm, and endoderm
答案: 【ectoderm, mesoderm, and endoderm】

第四章 体轴建立 第四章测试

1、 问题: The ‘organizer’ in Xenopus is responsible for
选项：
A:inducing a mesodermal fate in nearby cells
B:helping to pattern the mesoderm along the dorso-ventral axis
C:specifying the dorsal region of the embryo
D:all of these events
答案: 【helping to pattern the mesoderm along the dorso-ventral axis】

2、 问题:A key factor that specifies the organizer in Xenopus embryos is:
选项：
A:GSK-3β
B:Fz7
C:Wnt-11
D:β-catenin
答案: 【β-catenin】

3、 问题:Maternal factors are
选项：
A:the energy-rich yolk present in the eggs of many species
B:the genes contributed to the embryo by the maternal haploid genome
C:the genes expressed by the zygotic genome in the egg
D:developmentally active mRNAs and proteins packaged into the egg by the mother
答案: 【developmentally active mRNAs and proteins packaged into the egg by the mother】

4、 问题:The positioning of the dorso-ventral axis in Xenopus is deter mined by (   ), while the positioning of the antero-posterior axis in chicks is deternined by (   ).