If college students were cells, which of these would be determined but not diffe

Question

If college students were cells, which of these would be determined but not differentiated? A. A freshman student who is undecided as to his major. B. A freshman student that has declared a major. C. A senior student that is nearing graduation. D. An alumnus that has begun her career. Mice and humans differ in only 300 out of about 20,000 genes. How can we account for the fact that mice and humans are so different? a. The same genes are used for different functions. b. Different genes are transcribed. c. The timing of gene expression varies. d. All of the above. e. None of the above.

Explanation / Answer

59 B) A freshmen that has declared a major.

The determination of different cell types (cell fates) involves progressive restrictions in their developmental potentials. When a cell “chooses” a particular fate, it is said to be determined, although it still "looks" just like its undetermined neighbors. Determination implies a stable change - the fate of determined cells does not change.

Differentiation follows determination, as the cell elaborates a cell-specific developmental program. Differentiation results in the presence of cell types that have clear-cut identities, such as muscle cells, nerve cells, and skin cells.

60) All of the above

If there are very few mouse-specific and human-specific genes,still the species so different. The answer will likely involve functional differences in related genes, in how they are regulated, and in their protein structures.

This is the remark from the scientist who have conducted this study (for your reference)

http://www.genomenewsnetwork.org/articles/05_02/mouse_053102.shtml

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