Answer: Thymine.
- A Guanine
- B Cytosine
- C Thymine
- D Uracil
Correct answer: C. Thymine
Explanation: Adenine pairs with Thymine in DNA (2 hydrogen bonds). Guanine pairs with Cytosine (3 hydrogen bonds). In RNA, Adenine pairs with Uracil.
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.