To Find the Gene That Encodes for the Blue-Light Receptor

question 7

Multiple Choice

To find the gene that encodes for the blue-light receptor, researchers inserted the gene for the PHOT1 protein into insect cells growing in culture. When they exposed the transgenic cells to blue light, they found that the PHOT1 protein became phosphorylated. No other plant proteins were present in the insect cells. Which of the following is a reasonable conclusion from this result? The PHOT1 protein ________.

• A) enabled the insect cells to photosynthesize
• B) phosphorylated itself in the presence of blue light
• C) is not responsive to blue light
• D) is photoreversible
• E) is not functional in insect cells

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Definitions:

Insulate

To coat or surround with material in order to prevent the passage or leakage of heat, electricity, or sound.

Lipids

A broad class of naturally occurring molecules that include fats, oils, waxes, and certain vitamins, characterized by their insolubility in water.

Peptide

A short chain of amino acids linked by peptide bonds, which can function as signaling molecules or as components of proteins.

Polypeptide Chain

A long, continuous sequence of amino acids linked by peptide bonds, which folds into a functional protein or acts as part of a protein.