大学MOOC 发育生物学(天水师范学院)1452079232 最新慕课完整章节测试答案

第二章测试

1、单选题：
‌ 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、单选题：
​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、单选题：
​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、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 (   ).‍
选项：
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】

第三章单元测试

1、单选题：
‍If cells from the animal pole of a Xenopus blastula (animal cap cells) are placed in direct contact with cells from the vegetal region, what is the result?‎
选项：
A: Animal cap cells are induced by the vegetal cells to form meso dermal derivatives.
B: Vegetal hemisphere cells are induced by the animal cap cells to form mesodermal derivatives.
C: An embryo forms with only ectodermal and endodermal derivatives.
D: The embryo regulates and forms a normal embryo.
答案: 【 Animal cap cells are induced by the vegetal cells to form meso dermal derivatives.】

2、单选题：
‍Vg-1, Nodals, BMPs and activin are all members of which family of signaling molecules?‍
选项：
A: FGF
B: Hedgehog
C: TGF-β
D: Wnt
答案: 【 TGF-β】

3、单选题：
​The Brachury protein is‎
选项：
A: only expressed after gastrulation
B: expressed throughout the ectoderm
C: an early marker of the endoderm
D: an early marker of the mesoderm
答案: 【 an early marker of the mesoderm】

4、单选题：
​Endoderm and mesoderm are specified in the zebrafish blastoderm by‍
选项：
A: signals from the shield region
B: a gradient of β-catenin signaling
C: a gradient of Nodal signaling
D: maternal signaling molecules laid down in the egg
答案: 【 a gradient of Nodal signaling】

第三章测试

1、单选题：
​If cells from the animal pole of a Xenopus blastula (animal cap cells) are placed in direct contact with cells from the vegetal region, what is the result?‍
选项：
A: An embryo forms with only ectodermal and endodermal derivatives.
B: Animal cap cells are induced by the vegetal cells to form meso dermal derivatives.
C: The embryo regulates and forms a normal embryo.
D: Vegetal hemisphere cells are induced by the animal cap cells to form mesodermal derivatives.
答案: 【 Animal cap cells are induced by the vegetal cells to form meso dermal derivatives.】

2、单选题：
‏Vg-1, Nodals, BMPs and activin are all members of which family of signaling molecules?‎
选项：
A: FGF
B: Hedgehog
C: TGF-β
D: Wnt
答案: 【 TGF-β】

3、单选题：
‌The Brachury protein is‎
选项：
A: an early marker of the mesoderm
B: an early marker of the endoderm
C: expressed throughout the ectoderm
D: only expressed after gastrulation
答案: 【 an early marker of the mesoderm】

4、单选题：
‍Endoderm and mesoderm are specified in the zebrafish blastoderm by‎
选项：
A: signals from the shield region
B: maternal signaling molecules laid down in the egg
C: a gradient of β-catenin signaling
D: a gradient of Nodal signaling
答案: 【 a gradient of Nodal signaling】

第四章单元测试

1、单选题：
‏Somites will give rise to​
选项：
A: the vertebral column and skeletal muscles
B: the spinal cord
C: internal organs of the abdomen
D: heart and blood
答案: 【 the vertebral column and skeletal muscles】

2、单选题：
‏Somite formation in chicks proceeds‌