第二章测试

1、单选题：
‎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、单选题：
‎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、单选题：
‎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、单选题：
‏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.】

第三章测试

1、单选题：
‏Which of the following is a vertebrate ‘model organism’ used in the study of development?‍
选项：
A: Drosophila melanogaster
B: Homo sapiens
C: