A Researcher Is Using Adult Stem Cells and Comparing Them

question 62

Multiple Choice

A researcher is using adult stem cells and comparing them to other adult cells from the same tissue. Which of the following is a likely finding?

• A) The cells from the two sources exhibit different patterns of DNA methylation.
• B) Adult stem cells have more DNA nucleotides than their counterparts.
• C) The two kinds of cells have virtually identical gene expression patterns in microarrays.
• D) The nonstem cells have fewer repressed genes.
• E) The nonstem cells have lost the promoters for more genes.

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Definitions:

T-tubule

Tubular extensions of the cell membrane in muscle cells, which play a critical role in the conduction of electrical signals for muscle contraction.

Action Potential

A short-lasting event in which the electrical membrane potential of a cell rapidly rises and falls, allowing nerve cells to communicate.

Contractile Organelle

A cell component that is involved in the contraction and movement processes, such as muscle fibers.

Electromyogram

A diagnostic procedure to assess the health of muscles and the nerve cells that control them by recording the electrical activity produced by skeletal muscles.