뒤로Biology 1408 Chapters 7–9 Study Guide: Step-by-Step Guidance
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Q1. Distinguish between autotrophs and heterotrophs.
Background
Topic: Photosynthesis & Nutrition
This question tests your understanding of how organisms obtain energy and nutrients, focusing on the difference between those that make their own food and those that rely on other sources.
Key Terms:
Autotroph: An organism that produces its own food from inorganic substances.
Heterotroph: An organism that obtains food by consuming other organisms.
Step-by-Step Guidance
Consider the root meanings: 'auto' means self, 'hetero' means other.
Think about examples of each type (plants vs. animals).
Reflect on how each obtains energy—do they use sunlight or consume other organisms?
Write a clear definition for each, focusing on their method of obtaining food.
Try solving on your own before revealing the answer!
Final Answer:
Autotrophs are organisms that produce their own food from inorganic substances, typically using sunlight (photosynthesis), such as plants and algae. Heterotrophs are organisms that must consume other organisms for food, such as animals and fungi.
Q2. Describe the structure of a chloroplast, listing all membranes and compartments.
Background
Topic: Cell Structure & Photosynthesis
This question tests your knowledge of the organelle responsible for photosynthesis and its internal organization.
Key Terms:
Chloroplast: Organelle in plant cells where photosynthesis occurs.
Membranes: Outer, inner, and thylakoid membranes.
Compartments: Stroma, thylakoid space, grana.
Step-by-Step Guidance
Recall the basic structure: chloroplasts have multiple membranes.
Identify the outer and inner membranes.
Describe the thylakoid membrane system and how thylakoids are arranged.
List the main compartments: stroma, thylakoid space, grana.
Try solving on your own before revealing the answer!
Final Answer:
The chloroplast has an outer membrane, an inner membrane, and a third membrane system called thylakoids. Thylakoids are stacked into grana. The stroma is the fluid-filled space surrounding the thylakoids, and the thylakoid space is inside the thylakoids.
Q3. Write a summary equation for photosynthesis.
Background
Topic: Photosynthesis
This question tests your ability to recall the overall chemical reaction for photosynthesis.
Key Formula:
Step-by-Step Guidance
Recall the reactants: carbon dioxide, water, and light energy.
Recall the products: glucose and oxygen.
Write the balanced chemical equation using the correct formulas.
Try solving on your own before revealing the answer!
Final Answer:
The summary equation for photosynthesis is:
This shows that six molecules of carbon dioxide and six molecules of water, using light energy, produce one molecule of glucose and six molecules of oxygen.
Q4. In general terms, explain the role of redox reactions in photosynthesis.
Background
Topic: Photosynthesis & Redox Chemistry
This question tests your understanding of how electron transfer (oxidation and reduction) is involved in the process of photosynthesis.
Key Terms:
Redox reaction: A chemical reaction involving the transfer of electrons.
Oxidation: Loss of electrons.
Reduction: Gain of electrons.
Step-by-Step Guidance
Recall that photosynthesis involves the transfer of electrons from water to carbon dioxide.
Identify which molecule is oxidized and which is reduced.
Explain how energy from sunlight drives these electron transfers.
Try solving on your own before revealing the answer!
Final Answer:
In photosynthesis, water is oxidized (loses electrons) and carbon dioxide is reduced (gains electrons) to form glucose. Sunlight provides the energy needed for these redox reactions.
Q5. Describe the two main stages of photosynthesis in general terms. Where do the different reactions occur?
Background
Topic: Photosynthesis Stages
This question tests your understanding of the overall process of photosynthesis and the locations of its stages within the chloroplast.
Key Terms:
Light reactions: The first stage, converting solar energy to chemical energy.
Calvin cycle: The second stage, using chemical energy to synthesize sugars.
Thylakoid: Location of light reactions.
Stroma: Location of Calvin cycle.
Step-by-Step Guidance
Identify the two main stages: light reactions and Calvin cycle.
Describe what happens in each stage (energy conversion vs. sugar synthesis).
Recall the specific locations within the chloroplast where each stage occurs.
Try solving on your own before revealing the answer!
Final Answer:
The light reactions occur in the thylakoid membranes and convert solar energy to chemical energy (ATP and NADPH). The Calvin cycle occurs in the stroma and uses ATP and NADPH to synthesize sugars from CO2.
