Question

the products of photosynthesis are the
products of cellular respiration.
reactants of cellular respiration.
products of glycolysis.
reactants of fermentation.

which of the following statements is true about catalysts?
catalysts speed up the rate of chemical reactions.
all catalysts are enzymes.
catalysts are used up during a chemical reaction.
catalysts do not affect the activation energy of a chemical reaction.

which means of particle transport requires input of energy from the cell?
diffusion
osmosis
facilitated diffusion
active transport

Explanation:

First Question: The products of photosynthesis are the

Photosynthesis produces glucose and oxygen. Cellular respiration uses glucose and oxygen as reactants (its equation is the reverse of photosynthesis: \( C_6H_{12}O_6 + 6O_2
ightarrow 6CO_2 + 6H_2O + \text{energy} \), while photosynthesis is \( 6CO_2 + 6H_2O \xrightarrow{\text{light energy}} C_6H_{12}O_6 + 6O_2 \)). So photosynthesis products are cellular respiration reactants. Other options: Glycolysis products (pyruvate, ATP, NADH) don’t match; Fermentation reactants (like glucose for lactic acid fermentation) don’t match; Cellular respiration products (CO₂, H₂O) are photosynthesis reactants.

• Catalysts (like enzymes, but not all catalysts are enzymes, e.g., inorganic catalysts) speed up reactions by lowering activation energy. They are not used up, and they do affect activation energy (lower it). So “Catalysts speed up the rate of chemical reactions” is correct. Other options: “All catalysts are enzymes” is false (inorganic catalysts exist); “Catalysts are used up” is false (they remain); “Catalysts do not affect activation energy” is false (they lower it).

• Diffusion, osmosis, and facilitated diffusion are passive (no energy, move with concentration gradient). Active transport moves particles against the gradient, requiring ATP (energy from the cell).

Answer:

B. reactants of cellular respiration.

Second Question: Which of the following statements is true about catalysts?