Which Theory Best Explains the Finding That Parents' Lifespans Predict

question 82

Multiple Choice

Which theory best explains the finding that parents' lifespans predict those of their children, and identical twins share more similar lifespans than do fraternal twins?

• A) Aging immune system
• B) Cellular mutation
• C) Programmed genetics
• D) Free radicals

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Definitions:

Transcriptionally Active

Refers to genes that are currently being expressed, with their DNA being transcribed into messenger RNA.

Euchromatin

A loosely coiled chromatin that is generally capable of transcription. Compare with heterochromatin.

Heterochromatin

Heterochromatin is a tightly packed form of DNA, which makes it transcriptionally inactive, contributing to the regulation of genes and maintenance of chromosome structure.

Kinases

Enzymes that catalyze the transfer of phosphate groups from ATP to acceptor molecules. See protein kinases. Compare with phosphatases.