Podcast
Questions and Answers
What do the products of photosynthesis become?
What do the products of photosynthesis become?
- Energy sources for herbivores
- The reactants for photosynthesis
- Wastes for the cell
- The reactants for cellular respiration (correct)
Why can't cells use sugar directly for energy?
Why can't cells use sugar directly for energy?
- Sugar cannot be broken down in the presence of oxygen
- Energy from sugar is in an unusable form (correct)
- Sugar carries too much energy for cellular functions
- Cells require sugar to first transform into glucose
What analogy is used to explain the necessity of cellular respiration?
What analogy is used to explain the necessity of cellular respiration?
- A plant needing sunlight for growth
- Exchanging yen for dollars to shop (correct)
- A phone needing a charger to function
- A car needing gasoline to run
Which of the following best describes cellular respiration?
Which of the following best describes cellular respiration?
What energy form do muscle cells use to perform contractions?
What energy form do muscle cells use to perform contractions?
What is the primary source of energy for all living organisms on Earth?
What is the primary source of energy for all living organisms on Earth?
Which statement about cellular respiration and photosynthesis is true?
Which statement about cellular respiration and photosynthesis is true?
What process do plants use to convert sunlight into chemical energy?
What process do plants use to convert sunlight into chemical energy?
What must occur for cells to utilize the energy stored in sugar?
What must occur for cells to utilize the energy stored in sugar?
What happens during cellular respiration in organisms?
What happens during cellular respiration in organisms?
What type of reaction is photosynthesis classified as?
What type of reaction is photosynthesis classified as?
Which of the following substances are the products of cellular respiration?
Which of the following substances are the products of cellular respiration?
What is the main purpose of ATP in cells?
What is the main purpose of ATP in cells?
What is required for the process of photosynthesis to occur?
What is required for the process of photosynthesis to occur?
Which term describes the breakdown of sugar to release energy in living organisms?
Which term describes the breakdown of sugar to release energy in living organisms?
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Study Notes
Energy and Life
- All living things require energy for survival and reproduction.
- Energy is the ability to do work.
- Energy ultimately comes from the sun.
- Plants use the sun's energy to make sugar through photosynthesis.
- Organisms use sugar as a source of energy.
Photosynthesis
- Plants use energy from sunlight to make sugar and oxygen from carbon dioxide and water.
- This is an endergonic reaction requiring energy to combine carbon dioxide and water into sugar.
- The sun provides the energy needed to drive this process.
Cellular Respiration
- Organisms break down sugar to release stored energy, which is used to make ATP (adenosine triphosphate).
- This is an exergonic reaction where energy is released as sugar is broken down into carbon dioxide and water.
- Cellular respiration is the reverse of photosynthesis, with the products of one being the reactants of the other.
- Cellular respiration is necessary because cells can't directly use sugar as a source of energy.
- ATP is a more usable form of energy for cells to perform work, such as muscle contraction.
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