Vitamin C is chemically L-ascorbic acid. It is water-soluble, an antioxidant, and required for collagen synthesis. Deficiency causes scurvy. It is found in citrus fruits, amla, and green vegetables.
Consider the following statements about the pancreas:
1. It has both endocrine and exocrine functions.
2. Alpha cells secrete insulin.
3. Beta cells secrete glucagon.
Which of the above is/are correct?
Explanation:
The lac repressor protein (product of lacI gene) binds to the operator sequence, preventing RNA polymerase from transcribing the structural genes. When lactose is present, allolactose (inducer) binds the repressor, causing it to release the operator, allowing transcription. This is negative regulation.
No comments yet. Be the first to start the discussion!