1. A scientist studying aging grows young embryonic cells in tissue culture for

Question

1.

A scientist studying aging grows young embryonic cells in tissue culture for 20 cell divisions and then freezes them in liquid nitrogen; how many times will the cells divide if unfrozen and regrown in tissue culture?

3.

Which of the following is the correct order if you place number of times a cell type will divide in culture before stopping in the order of INCREASING number of successful cell divisions?

d) none of the above

4.

A scientist studying aging grows young embryonic cells in tissue culture for 20 cell divisions and then freezes them in liquid nitrogen; how many times will the cells divide if unfrozen and regrown in tissue culture?

Answers: a)30 times b)5 times c)12 times 2. A ribonucleoprotein enzyme that codes for placement of repeated DNA sequences at the end of chromatid arms in many species a) telomerase b) hTERT c) a reverse transcriptase d)all of the above

3.

Which of the following is the correct order if you place number of times a cell type will divide in culture before stopping in the order of INCREASING number of successful cell divisions?

Answers: a)cancer; progeroids; longest-lived species; centenarians; adult; embryonic b)centenarians; progeroids; adult; embryonic; longest-lived species; cancer c)progeroids; adult; embryonic; adult; centenarians; longest-lived species

d) none of the above

4.

Which of the following have been suggested as a candidate for the chronometer that measures aging in cells, tissues, and the organism? Answers: a)the hypothalamus b)the thymus c)chromosomal telomeres d)all of the above

Explanation / Answer

1) not sure

2) All the above

3) b

4) All of the above

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