Q:

In which organelle does photosynthesis occur?

A:

Photosynthesis occurs in the organelle called the chloroplast. The chloroplast contain the chlorophyll needed to capture the light energy so that it can be processed into energy and food for the plant.

Chloroplasts are made up of small sacs called thylakoid membranes. Each of these flat pancake-like membranes has photosystems set in a ray-like pattern to better capture and hold the light energy for use.

Chloroplasts are a type of plastid that circulate and move around inside the plant cells. These organelles reproduce by pinching themselves in two. This process occurs when a plastid dividing ring forms around the center of the chloroplast, then slowly begins to add pressure to the organelle until it splits under the ring leaving two chloroplast where there had been only one.

Chloroplasts cannot be made by the plant cell; instead, organelles must be inherited by each daughter cell during division. The chloroplast contains its own DNA, sometimes referred to as ctDNA or cpDNA, or plastome.

All of the genetic information is contained in one ring anywhere between 120,000 and 170,000 base pairs long. The chloroplast DNA was first proven to exist in 1962, but was not sequenced until 1986 by two Japanese research teams. Most of the DNA sequencing that has occurred for this comes from land plants or algae.


Is this answer helpful?

Similar Questions

  • Q:

    How does photosynthesis occur?

    A:

    Photosynthesis occurs when green plants harness the energy in sunlight and convert it to chemical energy in the form of sugars. Photosynthesis occurs in all green plants and a few other, simple organisms, such as algae and some bacteria. Photosynthetic organisms typically feature small structures called chloroplasts in their cells.

    Full Answer >
    Filed Under:
  • Q:

    In what organelle does cellular respiration occur?

    A:

    Cellular respiration takes place in the mitochondria. This is where the chemical energy of glucose, carbohydrates, fats and proteins is harvested and partially captured in the form of ATP. Cellular respiration involves glycolysis, the Krebs cycle and oxidative phosphorylation via the electron transport chain. Glycolysis occurs in the cytosol, and the other two processes occur in the mitochondria. In the absence of oxygen, respiration is confined to the cytosol.

    Full Answer >
    Filed Under:
  • Q:

    Which part of the chloroplast contains the Calvin cycle enzymes?

    A:

    The Calvin cycle takes place in the stroma of the chloroplast. Carbon dioxide enters the stroma of the chloroplast to combine with the five-carbon compound called ribulose1, 5-Biphosphate to form two molecules of a three-carbon compound called 3-Phosphoglyceric acid. This reaction is catalyzed by an enzyme called Ribulose bi-phosphate Carboxylase.

    Full Answer >
    Filed Under:
  • Q:

    In what part of a chloroplast does the Calvin cycle take place?

    A:

    The Calvin cycle takes place in the stroma of the chloroplast. The stroma is the fluid-filled section of the chloroplast in which the thylakoids stack up in structures known as grana.

    Full Answer >
    Filed Under:

Explore