Modern Cloning Techniques Have Demonstrated That the Vast Majority of Differentiated

question 4

Multiple Choice

Modern cloning techniques have demonstrated that the vast majority of differentiated cells are genetically equivalent to developing cells in the embryo.What is an exception to this finding?

• A)Nerve cells are often limited in their mitotic activity.
• B)In the immune system,sequences of DNA may rearrange to permit response to new pathogens.
• C)In the brain,DNA sequences may change with learned behavior.
• D)The lining of the digestive system is frequently replaced.Some of these cells may show repeats of certain DNA sequences.

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Definitions:

Decane

A straight-chain alkane with ten carbon atoms; a hydrocarbon molecule with the formula C10H22.

Zig-zag Conformation

A representation of the spatial arrangement of carbon atoms in saturated hydrocarbons, indicating a sequential alternation in direction.

Alkanes

Saturated hydrocarbons consisting solely of hydrogen and carbon atoms, with single bonds between the carbon atoms, exemplified by molecules such as methane, ethane, and propane.

Freons

A trademarked name for a group of chlorofluorocarbon (CFC) and hydrochlorofluorocarbon (HCFC) gases used primarily as refrigerants and aerosol propellants, now commonly linked to ozone depletion.