Answer: Uracil.
- A Adenine
- B Guanine
- C Cytosine
- D Uracil
Correct answer: D. Uracil
Explanation: RNA contains Uracil instead of Thymine. Uracil pairs with Adenine. The lack of a methyl group makes it slightly less stable.
As substrate concentration rises, reaction rate increases steeply at first, then plateaus at Vmax once every enzyme molecule is working at full capacity; Km is the substrate concentration giving half-maximal rate, and a LOWER Km means the enzyme reaches that rate with less substrate (higher affinity).
Concept context
Carbohydrates, proteins, lipids, nucleic acids, and enzyme kinetics. Essential foundation for understanding metabolism.