Question

1. which process allows glycolysis to continue in the absence of oxygen?

a. chemosynthesis
b. photosystem i
c. cellular respiration
d. fermentation

1. what is the equation for cellular respiration?

a. o₂ + c₆h₁₂o₆ → co₂ + h₂o
b. o₂ + h₂o → co₂ + c₆h₁₂o₆
c. co₂ + h₂o → o₂ + c₆h₁₂o₆
d. h₂o + c₆h₁₂o₆ → o₂ + co₂

1. which of the following is true about cellular respiration?

a. glycolysis, the krebs cycle, and oxidative phosphorylation are all steps of cellular respiration.
b. cellular respiration and photosynthesis are parts of a mutually beneficial relationship and one cannot occur without the other.
c. cellular respiration is a metabolic pathway that breaks down glucose and produces atp.
d. all of the above.

Explanation:

• Question 18: Fermentation regenerates NAD+ from NADH, allowing glycolysis (which requires NAD+) to continue without oxygen. Chemosynthesis is a process for energy production in some bacteria. Photosystem I is part of photosynthesis. Cellular respiration (aerobic) requires oxygen.
• Question 19: The balanced equation for cellular respiration is \(O_2 + C_6H_{12}O_6

ightarrow CO_2 + H_2O\). Option c is the photosynthesis equation. Options b and d have incorrect reactants/products combinations.

• Question 20: Glycolysis, Krebs Cycle, and oxidative phosphorylation are steps of cellular respiration. Cellular respiration (producing \(CO_2\)) and photosynthesis (using \(CO_2\) and producing \(O_2\) which is used in cellular respiration) are mutually beneficial. Cellular respiration breaks down glucose to produce ATP. So all statements (a, b, c) are true, making d (All of the above) correct.

Answer:

1. d. Fermentation
2. a. \(O_2 + C_6H_{12}O_6

ightarrow CO_2 + H_2O\)

1. d. All of the above