What does the thylakoid membrane contain?
The thylakoid membrane systems of cyanobacteria and of plant and algal chloroplasts contain the specialized photosystems, photosystem I (PSI), and photosystem II (PSII), in which the reaction centers photochemically transform light energy into useable chemical energy in the form of ATP and NADPH through photosynthetic …
What process occurs in the thylakoid sacs of the chloroplast?
The light reactions of photosynthesis occur in the thylakoid membranes of the chloroplast. Electron carrier molecules are arranged in electron transport chains that produce ATP and NADPH, which temporarily store chemical energy.
What is the function of thylakoid in chloroplast?
Thylakoids are the internal membranes of chloroplasts and cyanobacteria, and provide the platform for the light reactions of photosynthesis.
What are sacs of chloroplasts called?
Figure 1. Like mitochondria, chloroplasts have outer and inner membranes, but within the space enclosed by a chloroplast’s inner membrane is a set of interconnected and stacked fluid-filled membrane sacs called thylakoids (Figure 1). Each stack of thylakoids is called a granum (plural = grana).
What are the advantages that chloroplasts give to plant cells?
Chloroplasts are plant cell organelles that convert light energy into relatively stable chemical energy via the photosynthetic process. By doing so, they sustain life on Earth. Chloroplasts also provide diverse metabolic activities for plant cells, including the synthesis of fatty acids, membrane lipids.
Do chloroplasts move from cell to cell?
Chloroplasts do move in a cell. They jostle and slide and scoot around the cell, often sticking near the edges of the cell but sometimes seeming to fill the cell entirely with constant motion. The motion is common to the interior of cells and is called cyclonic or cytoplasmic streaming.
What cells do only animals have?
Animal cells each have a centrosome and lysosomes, whereas plant cells do not. Plant cells have a cell wall, chloroplasts and other specialized plastids, and a large central vacuole, whereas animal cells do not.
Why chloroplast are found only in plant cells?
Chloroplasts are found in plant cells only because chloroplasts contain chlorophyll which is essential for photosynthesis. Chlorophyll traps sunlight and uses it to prepare food for plants by the process of photosynthesis.
What is the major difference between plant cell and animal cell?
A plant cell is larger than an animal cell. The shape of a plant cell is a fixed rectangular shape, whereas an animal cell is mostly round and irregular in shape. Plant cells store energy in the form of scratch while animal cells store energy in the form of complex carbohydrates and glycogen.
Does Plasmolysis kill cells?
Plasmolysis is when plant cells lose water after being placed in a solution that has a higher concentration of solutes than the cell does. This is known as a hypertonic solution. Severe water loss that leads to the collapse of the cell wall can result in cell death.
Can Plasmolysis happen in animal cells?
Plasmolysis occurs when a plant cell is placed in a hypertonic environment, which leads to shrinking of a cell membrane away from the cell wall. Water moves out of the cell and the protoplast shrinks away from the cell wall. Animal cells do not contain cell walls so plasmolysis does not occur in animal cells.
What is osmosis in biology class 9?
Osmosis is the passage ot water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration. If the medium surrounding the cell has a higher water concentration than the cell, the cell will gain water by osmosis. Such a solution is known as hypotonic solution.