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Questions and Answers
What is the most abundant component of an organism?
What is the most abundant component of an organism?
- Lipids
- Carbohydrates
- Proteins
- Water (correct)
Why is water important for living things?
Why is water important for living things?
- Because it acts as a medium for chemical reactions (correct)
- To regulate body temperature
- Due to its ability to capture sunlight for energy
- For providing structural support to cells
What is the configuration of water molecules that contributes to its solvent property?
What is the configuration of water molecules that contributes to its solvent property?
- Straight line arrangement
- Symmetrical arrangement (correct)
- Irregular arrangement
- Layered arrangement
Which property of water allows it to form droplets on surfaces?
Which property of water allows it to form droplets on surfaces?
What property of water allows it to effectively weaken the attraction between ions of opposite charges?
What property of water allows it to effectively weaken the attraction between ions of opposite charges?
Why is the high heat capacity of water considered biologically important?
Why is the high heat capacity of water considered biologically important?
How does the freezing property of water differ from most other liquids?
How does the freezing property of water differ from most other liquids?
What percentage of Earth's surface is covered by water?
What percentage of Earth's surface is covered by water?
What does pH measure in a solution or medium?
What does pH measure in a solution or medium?
Why does water readily dissolve ionic solids and polar molecules?
Why does water readily dissolve ionic solids and polar molecules?
What is the central focus of Unit 1?
What is the central focus of Unit 1?
Which of the following is NOT a part of the objectives of this unit?
Which of the following is NOT a part of the objectives of this unit?
In the context of respiration, what is the electron transport system responsible for?
In the context of respiration, what is the electron transport system responsible for?
According to the module, can non-biological organisms such as metal, iron, and plastic carry out respiration?
According to the module, can non-biological organisms such as metal, iron, and plastic carry out respiration?
What is the overall purpose of respiration in living organisms?
What is the overall purpose of respiration in living organisms?
Which of the following is a key reason why living organisms undergo respiration?
Which of the following is a key reason why living organisms undergo respiration?
In which phase of respiration do food substrates like carbohydrates, fats, and proteins get broken down into glucose or fructose?
In which phase of respiration do food substrates like carbohydrates, fats, and proteins get broken down into glucose or fructose?
What is the end product of anaerobic respiration?
What is the end product of anaerobic respiration?
Where does aerobic respiration take place within a cell?
Where does aerobic respiration take place within a cell?
Which gas undergoes exchange during the process of respiration?
Which gas undergoes exchange during the process of respiration?
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Study Notes
Water and Its Importance
- Water is the most abundant component of an organism.
- Water's importance for living things lies in its ability to dissolve a wide variety of substances, allowing it to play a crucial role in many biological processes.
Water's Unique Properties
- The bent or V-shape configuration of water molecules (H2O) contributes to its solvent property.
- Water's high surface tension allows it to form droplets on surfaces.
- Water's dielectric property allows it to effectively weaken the attraction between ions of opposite charges.
Water's Biological Significance
- The high heat capacity of water is considered biologically important because it helps regulate an organism's temperature.
- Water's freezing property differs from most other liquids in that it expands as it freezes.
Water Coverage and pH
- Water covers approximately 71% of the Earth's surface.
- pH measures the concentration of hydrogen ions in a solution or medium.
Solubility of Water
- Water readily dissolve ionic solids and polar molecules due to its polar nature.
Unit 1 Overview
- The central focus of Unit 1 is on the biology of cells and organisms.
- Understanding the importance of water and its unique properties is not an objective of this unit.
Respiration Basics
- The electron transport system is responsible for generating energy in the form of ATP during respiration.
- Non-biological organisms such as metal, iron, and plastic cannot carry out respiration.
- The overall purpose of respiration in living organisms is to generate energy from the breakdown of food molecules.
Phases of Respiration
- In the glycolysis phase, food substrates like carbohydrates, fats, and proteins get broken down into glucose or fructose.
- The end product of anaerobic respiration is lactic acid or ethanol and carbon dioxide.
- Aerobic respiration takes place in the mitochondria within a cell.
- Oxygen is the gas that undergoes exchange during the process of respiration.
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