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CELL BIOLOGY QUESTIONS
1. DNA occurs in the _S_ phase of the cell cycle.
2. During mammalian embryonic development, the central nervous system (CNS) develops from the ____ after gastrulation.
3. The zygote is an example of a __totipotent__ cell.
4. Define the following.
(a) Necrosis
(b) Differentiation
(c) Tissue specific gene expression
(d) Gastrulation
5. The morphogen Bicoid helps establish the ____ in the developing embryo.
6. What does morphogen contribute to?
7. What do homeotic genes do?
8. Homeobox genes are a class of master genes which control the formation of __specific body parts__ in the developing embryo.
9. Define stem cell.
10. Which of the following cell types has the lowest proliferative ability?
(a) Endothelial cells
(b) Liver hepatocytes
(c) Bone marrow stem cells
(d) Neurons
11. Which of the following cell types do not have a G0 phase? [ANS: B]
(a) Cardiac muscle cells
(b) Embryonic stem cells
(c) Liver hepatocytes
(d)neurons
12. Which of the following is a characteristic of all stem cells? [ANS: D]
(a) Long G0 cell-cycle phase
(b) Antibody production
(c) Self-renewal ability
(d) Ability to differentiate into all 3 germ layers
13. gastrulation onwards, certain groups of genes are activated in some cells but not others. This process is referred to as: [ANS: D]
(a) Apoptosis
(b) Cell migration
(c) Compaction
(d) Tissue specific gene expression
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