In dark-grown or etiolated plants, phytochrome is present in a red light–absorbing form, referred to as Pr. Pr, which to the human eye is blue, is converted by red light to a far-red light–absorbing form called Pfr, which is blue-green. 

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#Id: 9733

#Unit 6. System Physiology – Plant

For many aphids, EBF is the principal constituent of the aphid alarm pheromone, and the constitutive production of EBF by plants could hold promise in the control of specific aphid pests

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#Id: 867

#Unit 13. Methods in Biology

Size of the primer negatively affects the efficiency of PCR.

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#Id: 522

#Unit 2. Cellular Organization

An Interrupted Gene Consists of Exons and Introns.

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#Id: 2256

#Unit 11. Evolution and Behavior

Overdominance, the heterozygote has higher fitness than the  fitness of the two homozygotes.

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#Id: 4475

#Unit 13. Methods in Biology

Phase-contrast microscopy is suitable for observing single cells or thin cell layers.