Answer: 3.4 nm, covering ten base pairs.
- A 0.34 nm, covering one base pair
- B 2.0 nm, covering five base pairs
- C 3.4 nm, covering ten base pairs
- D 34 nm, covering thirty base pairs
Correct answer: C. 3.4 nm, covering ten base pairs
Explanation: In B-DNA the pitch is ~3.4 nm per turn and each turn contains about 10 base pairs (rise ~0.34 nm per pair).
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.