6. (Fill in blank) Vegetal pole of a blastula is the yolk-rich pole, because inh

Question

6. (Fill in blank) Vegetal pole of a blastula is the yolk-rich pole, because inhibits cell division, therefore, vegetal pole has cells than the animal pole. (2 points) 7. Which of the following is correct about the status of a differentiated cell? (1 point) A. Cell fate can change if the environmental factors change B. A cell ceases division and develops special structural elements and distinct functions C. Cell fate is specified but not determined yet D. Cell fate is committed to a specialized type of cells, but a cell still has the capacity to divide and produce new cells 8. (Fill in blank) Genomic equivalence means that all somatic cell nucleus has the same set of Even if all the somatic cells are genetically equivalent, there are diverse types of specialized somatic cells. This is due to gene expression (2 points) 9. (Short answer) Regulation of differential gene expression involves many mechanisms. A very first step to activate gene expression is to make the genes accessible to RNA polymerase II and transcription factors. Histone proteins can be modified to change the accessibility of DNAs. What are the two key types of histone modifications that can modulate DNA accessibility? (1 points) Generally how does each type of modification regulate gene expression? (2 points) 10. T/F. Histone acetyltransferases are associated with transcription activation, while histone deacetylases are associated with transcription inhibition. (1 point)

Explanation / Answer

Q7=Correct ans. is D.Cell fate is committed to a specialised type of cell,but a cell still has a capacity to divide and produce new cells.

Q8=(1) ___Chromosome__ (2) ___Somatic Gene expressions____

Q12= in the following options RNA 3'Poly(A)Tail is not regulatory so option D is right answer.

Q14=Enhancer control when and where a promoter can used and how much gene product to make.so option B is correct

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