发育生物学(天水师范学院) 中国大学mooc慕课答案2024版 m53239

第二章 基本概念

第二章测试

1、单选题：
‏Which of the following is a germ cell?‏

A: cells of the gonads
B: intestinal cells
C: sperm and eggs
D: zygotes
答案:  sperm and eggs

2、单选题：
Which of the following basic developmental processes is most dependent on cellular movements?​

A: cell differentiation
B: growth
C: morphogenesis
D: pattern formation
答案:  morphogenesis

3、单选题：
​A morphogen is​

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、单选题：
​What distinguishes stem cells from other cell types?‏

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.

第三章 脊椎动物生命周期和发育概要

第三章测试

1、单选题：
‌Which of the following is a vertebrate ‘model organism’ used in the study of development?‏

A: Drosophila melanogaster
B: Homo sapiens
C: Caenorhabditis elegans
D: Xenopus laevis
答案:  Xenopus laevis

2、单选题：
‏The nervous system, heart, and liver are derived from (   ), (   ), and (    ), respectively.‌

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、单选题：
‍ The ‘organizer’ in Xenopus is responsible for‌

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、单选题：
‍A key factor that specifies the organizer in Xenopus embryos is:‏

A: GSK-3β
B: Fz7
C: Wnt-11
D: β-catenin
答案:  β-catenin

3、单选题：
‎Maternal factors are‍

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、单选题：
‌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 (   ).‏

A: gravity; point of sperm entry
B: maternal factors in both cases
C: position in the egg chamber; gravity
D: the point of sperm entry; gravity
答案:  the point of sperm entry; gravity

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