Tyr122 Is Important in the Mechanism of the E

question 1

Multiple Choice

Tyr122 is important in the mechanism of the E.coli ribonucleotide reductase.The function of this amino acid in the mechanism is to

• A) carry out a nucleophilic attack on the substrate.
• B) coordinate water in the active site.
• C) generate the Cys439 radical species.
• D) hydrogen-bond to the phosphates of the substrate.

---

Definitions:

Circadian Arousal

The fluctuation of physiological and behavioral processes, including wakefulness and sleepiness, following a roughly 24-hour cycle, influenced by external light-dark cycles.

Melatonin Secretion

The release of the hormone melatonin by the pineal gland, typically increased in response to darkness, influencing sleep patterns.

Sharpest Thinking

The state of having the most acute, focused, or keen cognitive function, allowing for optimal problem-solving and decision-making.

Sequential Processing

The method of processing information in a linear, step-by-step manner, often contrasted with parallel processing.