When a New England Farm Is Abandoned, Its Formerly Plowed

question 15

Multiple Choice

When a New England farm is abandoned, its formerly plowed fields first become weedy meadows, then shrubby areas, and finally forest. This sequence of plant communities is an example of

• A)evolution.
• B)a trophic chain.
• C)secondary succession.
• D)primary succession.

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Definitions:

Leucine Zipper Proteins

A type of protein that contains a specific motif which allows it to dimerize and bind DNA, playing key roles in regulating gene expression.

Homodimers

Molecular complexes formed from two identical protein molecules that bind together, often to become functionally active.

Heterodimers

Molecular complexes formed by the pairing of two non-identical molecules, often proteins, which can have unique functional properties.

Gene Regulation

The process by which cells control the expression and activity of their genes, ensuring that the right genes are expressed at the right times and levels, enabling cells to respond to environmental changes and maintain homeostasis.