Question

what are the reactants of cellular respiration? *
a. glucose and carbon dioxide
b. oxygen and water
c. glucose and oxygen
d. carbon dioxide and water

all organisms do respiration. *
a. true
b. false

all cells have a nucleus. *
a. true
b. false

animals have cell membranes and chloroplasts. *
a. true
b. false

Explanation:

First Question: "What are the reactants of cellular respiration?"

Cellular respiration is the process where cells break down glucose to release energy. The chemical equation for aerobic cellular respiration is \( C_6H_{12}O_6 + 6O_2
ightarrow 6CO_2 + 6H_2O + \text{Energy} \). Reactants are the substances that start the reaction, so glucose (\( C_6H_{12}O_6 \)) and oxygen (\( O_2 \)) are the reactants. Option A has carbon dioxide (a product), B has water (a product in some cases, not a main reactant here), D has carbon dioxide and water (products). So the correct option is C.

Respiration is a fundamental life process where organisms break down nutrients to release energy. All living organisms, from single - celled bacteria to complex multicellular animals and plants, need energy to survive, grow, and reproduce. Even anaerobic organisms (like some bacteria) perform respiration (anaerobic respiration) to obtain energy. So the statement "All organisms do respiration" is true.

Cells are divided into prokaryotic and eukaryotic cells. Prokaryotic cells (e.g., bacteria) do not have a membrane - bound nucleus. Their genetic material is present in a region called the nucleoid. Only eukaryotic cells (e.g., plant, animal, fungal cells) have a true, membrane - bound nucleus. So the statement "All cells have a nucleus" is false.

Answer:

C. Glucose and oxygen

Second Question: "All organisms do respiration."