The pH of endocytic vesicles is 5.2, and the pH of gastric juice is 2.0. The endocytic vesicle has a [H+] that is:

Correct option is D

pH of endocytic vesicle = 5.2

[H⁺] concentration of endocytic vesicle => pH = -log [H⁺] 
5.2 = -log [H⁺]
∴ [H⁺] = 6.31 × 10⁻⁶ mol/L

pH of gastric juice = 2
[H⁺] concentration of gastric juice =>
pH = -log [H⁺]
2 = -log [H⁺]
∴ [H⁺] = 1 × 10⁻² mol/L

∴[H⁺] of gastric juice
------------------------------ 
[H⁺] of endocytic vesicle

= (1 × 10⁻²) / (6.31 × 10⁻⁶)
= (1 / 6.31) × 10⁴
= 0.1585 × 10⁴
= 1585

Information Booster:

1. The pH scale is logarithmic; a one-unit change represents a tenfold difference in [H+].
2. Gastric juice has a highly acidic environment, aiding in digestion.
3. Endocytic vesicles typically maintain a near-neutral to slightly acidic pH.
4. A pH difference significantly impacts enzymatic activity and cellular transport mechanisms.
5. The ratio between [H+] can be calculated using pH = pH2-pH1