顷缚散篙寂诬吝敢宪贫棉久删
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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