What is the organelle labeled "C?"

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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What is the organelle labeled "C?"

The image is a detailed diagram of a chloroplast, which is the organelle responsible for photosynthesis in plant cells and some algae. The chloroplast is shown with its two membranes:

- **Outer Membrane**: The outermost layer of the chloroplast that separates it from the cytoplasm.
- **Inner Membrane**: The layer located just beneath the outer membrane.

Inside the chloroplast, there are structures labeled:

- **A: Thylakoid**: A disk-shaped sac that contains chlorophyll and other pigments; the site of the light-dependent reactions of photosynthesis.
- **B: Granum (plural: Grana)**: A stack of thylakoids. Grana are connected by lamellae, allowing for increased surface area for light absorption.
- **C: Stroma**: The fluid-filled space surrounding the grana, containing enzymes for the light-independent reactions (Calvin cycle), DNA, ribosomes, and other components.

The structure's design optimizes the ability to capture and convert light energy into chemical energy, facilitating the process of photosynthesis.
Transcribed Image Text:The image is a detailed diagram of a chloroplast, which is the organelle responsible for photosynthesis in plant cells and some algae. The chloroplast is shown with its two membranes: - **Outer Membrane**: The outermost layer of the chloroplast that separates it from the cytoplasm. - **Inner Membrane**: The layer located just beneath the outer membrane. Inside the chloroplast, there are structures labeled: - **A: Thylakoid**: A disk-shaped sac that contains chlorophyll and other pigments; the site of the light-dependent reactions of photosynthesis. - **B: Granum (plural: Grana)**: A stack of thylakoids. Grana are connected by lamellae, allowing for increased surface area for light absorption. - **C: Stroma**: The fluid-filled space surrounding the grana, containing enzymes for the light-independent reactions (Calvin cycle), DNA, ribosomes, and other components. The structure's design optimizes the ability to capture and convert light energy into chemical energy, facilitating the process of photosynthesis.
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