Kloroplasteja

Kloroplasteja is the Latvian term for chloroplasts. Chloroplasts are organelles found in plant cells and eukaryotic algae that conduct photosynthesis. They are also known as plastids, which are a diverse group of organelles involved in synthesis and storage of food.

Within chloroplasts, light energy is captured and used to convert carbon dioxide, water, and minerals into oxygen and energy-rich organic compounds. This process is crucial for life on Earth, as it forms the base of most food chains and produces the oxygen we breathe. The characteristic green color of plants is due to the presence of chlorophyll, a pigment located within the chloroplasts that absorbs light energy.

Chloroplasts have a complex internal structure. They are enclosed by a double membrane, and within this outer boundary lies the stroma, a fluid-filled space containing enzymes, ribosomes, and chloroplast DNA. Suspended within the stroma are stacks of flattened sacs called thylakoids, which are arranged in structures known as grana. It is within the thylakoid membranes that the light-dependent reactions of photosynthesis occur.

The precise size and shape of chloroplasts can vary, but they are typically oval or lens-shaped. They can move within the cell, sometimes to optimize light absorption and other times to avoid photodamage. Chloroplasts are believed to have originated from cyanobacteria through an endosymbiotic event, a theory supported by their double membrane, their own DNA, and their mode of reproduction.