The chemical reaction that links amino acids together is a:
A. Hydrolysis
B. Oxidation
C. Reduction
D. Dehydration synthesis
Answer: Option D
Solution (By JKExamLibrary)
Peptide bond formation is a condensation (dehydration synthesis) reaction where the carboxyl group of one amino acid reacts with the amino group of another, releasing a water molecule. Hydrolysis breaks bonds by adding water. Oxidation/reduction involve electron transfer. Dehydration synthesis builds polymers.
Explanation:
Under normal conditions, the brain relies almost exclusively on glucose for energy. During prolonged fasting, it can adapt to use ketone bodies. Fatty acids cannot cross the blood-brain barrier.
Explanation:
Secretin, released from the duodenum in response to acidic chyme, stimulates the pancreas to secrete bicarbonate-rich fluid to neutralize the acid. Gastrin stimulates HCl, CCK enzyme secretion, motilin GI motility.
Explanation:
Crassulacean Acid Metabolism (CAM) plants, such as cacti and succulents, adapt to arid environments by opening their stomata at night to fix CO2 into organic acids (like malic acid) and storing them in vacuoles. During the day, the stomata close to prevent water loss, and the stored CO2 is released for the Calvin cycle.
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