date:
lifework
1. why does every organism need to do respiration in some way?

2. what happens to matter in cellular respiration?

3. where does cellular respiration take place?

4. when you speak under water, you produce bubbles. what is in those bubbles? how do
you know?

5. what types of cells do you think have the most mitochondria?
a. nose cells
b. skin cells
c. muscle cells
d. ear cells

Question

date:
lifework
1. why does every organism need to do respiration in some way?

2. what happens to matter in cellular respiration?

3. where does cellular respiration take place?

4. when you speak under water, you produce bubbles. what is in those bubbles? how do
you know?

5. what types of cells do you think have the most mitochondria?
  a. nose cells
  b. skin cells
  c. muscle cells
  d. ear cells

Accepted Answer

### Question 1
# Brief Explanations:
Organisms need energy for life processes (growth, movement, etc.). Respiration (cellular or gaseous) breaks down organic compounds (like glucose) to release energy (ATP). Without respiration, energy can't be obtained from food, so all organisms need some form of respiration to generate energy for survival.
# Answer:
Every organism needs respiration to obtain energy (in the form of ATP) from organic molecules (like glucose) to power essential life processes (growth, metabolism, movement, etc.). Without respiration, energy for these processes wouldn't be available, so organisms must respire to survive.

### Question 2
# Brief Explanations:
In cellular respiration, matter (glucose and oxygen) is transformed. Glucose ($\ce{C6H12O6}$) and oxygen ($\ce{O2}$) are broken down. Glucose is oxidized, and oxygen is reduced. The products are carbon dioxide ($\ce{CO2}$), water ($\ce{H2O}$), and energy (ATP). Matter is conserved but rearranged: atoms in glucose and oxygen form $\ce{CO2}$ (carbon and oxygen from glucose/oxygen) and $\ce{H2O}$ (hydrogen from glucose, oxygen from oxygen), while energy is released.
# Answer:
In cellular respiration, glucose (and other organic molecules) and oxygen are broken down. Glucose is oxidized, and oxygen is reduced. Matter is rearranged: carbon from glucose becomes carbon dioxide ($\ce{CO2}$), hydrogen becomes water ($\ce{H2O}$), and oxygen is used to oxidize glucose. The products are $\ce{CO2}$, $\ce{H2O}$, and energy (ATP), with matter conserved but transformed into these new compounds.

### Question 3
# Brief Explanations:
Cellular respiration has two main stages: glycolysis (in the cytoplasm) and aerobic respiration (in mitochondria, if oxygen is present). Glycolysis occurs in the cell’s cytoplasm, breaking glucose into pyruvate. If oxygen is available, the Krebs cycle (in mitochondrial matrix) and electron transport chain (in mitochondrial inner membrane) occur in the mitochondria. Anaerobic respiration (fermentation) also starts with glycolysis in the cytoplasm. So, glycolysis is in the cytoplasm, and aerobic respiration (Krebs, ETC) is in mitochondria.
# Answer:
Cellular respiration occurs in two main locations: **cytoplasm** (for glycolysis, the first step, which breaks glucose into pyruvate) and **mitochondria** (for aerobic respiration: the Krebs cycle occurs in the mitochondrial matrix, and the electron transport chain occurs in the inner mitochondrial membrane). Anaerobic respiration (fermentation) also begins in the cytoplasm.

### Question 4
# Brief Explanations:
When speaking underwater, the bubbles contain **carbon dioxide ($\ce{CO2}$) and/or oxygen ($\ce{O2}$) from exhaled breath**. When you speak, you exhale air (from lungs) into the water. Air is ~21% $\ce{O2}$ and ~78% $\ce{N2}$, but during respiration, your body produces $\ce{CO2}$, so exhaled air has higher $\ce{CO2}$ (and less $\ce{O2}$) than inhaled air. The bubbles are exhaled gas (air) released from your mouth/nose into water, so they contain respiratory gases ($\ce{CO2}$, residual $\ce{O2}$, $\ce{N2}$, etc.). We know because speaking requires exhaling, and the gas from the lungs (with respiratory byproducts like $\ce{CO2}$) is released as bubbles.
# Answer:
The bubbles contain **exhaled air** (gases like carbon dioxide ($\ce{CO2}$), residual oxygen ($\ce{O2}$), nitrogen ($\ce{N2}$), etc.). When you speak underwater, you exhale air from your lungs (where cellular respiration produces $\ce{CO2}$ and uses $\ce{O2}$) into the water. The bubbles are this exhaled gas (from your breath) released into the water. We know because speaking involves exhaling, and the gas from the respiratory system (with $\ce{CO2}$ as a byproduct of respiration) is expelled as bubbles.

### Question 5
# Brief Explanations:
Mitochondria produce ATP (energy) for the cell. Cells with high energy demands need more mitochondria. Muscle cells (option c) require large amounts of energy for contraction/relaxation (movement, exercise, etc.). Nose, skin, and ear cells have lower energy needs (e.g., skin cells mainly protect, ear cells detect sound, nose cells sense smell—none require as much energy as muscle cells for repeated, forceful contractions). So muscle cells have the most mitochondria.
# Answer:
c. Muscle cells

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