Which of the Following Must Occur for a Plant to Initiate

question 57

Multiple Choice

Which of the following must occur for a plant to initiate chemical responses to herbivory, before it is directly affected by herbivores?

• A) a plant must be old enough to have already flowered at least once
• B) volatile "signal" compounds must be perceived from already attacked plants
• C) gene-for-gene intraspecific recognition must occur between the plant and the herbivore
• D) phytoalexins must be released by the herbivore

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Definitions:

Centromere

A specialized constricted region of a chromatid; contains the kinetochore. In cells at prophase and metaphase, sister chromatids are joined in the vicinity of their centromeres.

Nucleosomes

Structural units of a chromosome, consisting of a segment of DNA wound around a core of histone proteins.

Histone Proteins

Proteins found in the nucleus of eukaryotic cells that package and order the DNA into structural units called nucleosomes.

Eukaryotic DNA

The genetic material contained within the nucleus of eukaryotic cells, characterized by its linear chromosomes.