A barley mutant lacking a gibberellic acid receptor would (A) fail to make GA. (B) catalyze starch more quickly. (C) fail to make a-amylase. (D) fail to take up water.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Gibberellic Acid (GA)

Gibberellic acid is a plant hormone that plays a crucial role in regulating growth and development processes, including seed germination, stem elongation, and flowering. It promotes the synthesis of enzymes like a-amylase, which are essential for breaking down starches into sugars during germination.

Gibberellic Acid Receptor

The gibberellic acid receptor is a protein that binds to gibberellic acid, initiating a signal transduction pathway that leads to the expression of genes involved in growth and development. A mutant lacking this receptor would be unable to respond to GA, disrupting normal physiological processes.

a-Amylase

a-Amylase is an enzyme that catalyzes the hydrolysis of starch into sugars, playing a vital role in the germination of seeds. In the absence of gibberellic acid signaling, the production of a-amylase is inhibited, which would hinder the plant's ability to utilize stored starch for energy during early growth stages.

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