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Why do people yawn when they are tired?( I can't stop yawning because I am so tired, but am fighting sleep.)
Explain briefly how : (i) The small intestine is adapted to perform its role efficiently; (ii) The small intestine is protected from self-digestion.
The mechanism by which the presence of lactose controls the lactose operon. A. Catabolic repression B. Translation C. DNA polymerase D. Repression E. Induction