repressible enzyme

[ rĭ-prĕsə-bəl ]

n.

An enzyme whose production is generally continuous but can be halted if a particular substance is present in concentrations greater than normal.

QUIZZES

IS YOUR DESERT PLANT KNOWLEDGE SUCCULENT OR DRIED UP?

Cactus aficionados, don't get left in the dust with this quiz on desert plants. Find out if you have the knowledge to survive this prickly foray into the desert!
Question 1 of 7
This tall, horizontally branched cactus is probably the most recognizable cactus in Arizona. What is it called?
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.