Q:

What do chloroplasts contain?

A:

Quick Answer

Chloroplasts contain multiple structures, including the membrane envelope, stroma, grana, thylakoid membrane and chlorophyll. Choloroplasts are the organelles within plant cells where photosynthesis takes place.

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Full Answer

The membrane envelope consists of an inner and outer membrane that provides a seal of sorts, enclosing the chloroplast. The stroma is the thick fluid inside the membrane envelope. This is where carbohydrates are converted to energy. The grana is a stack of thylakoid sacs, vital to the process of photosynthesis. The thylakoid membrane consists of individual thylakoids, which is where energy from the sun is converted into energy the plant can use. Chlorophyll is the structure that absorbs energy from the sun, providing food to the plant.

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Related Questions

  • Q:

    What are chloroplasts made of?

    A:

    A chloroplast is an organelle that performs photosynthesis. It contains an envelope, which is composed of an outer membrane, inner membrane and an intermembrane space between these layers. The stroma is located inside the envelope. A genome with ribosomes, RNAs, and chloroplast DNA is found in the stroma.

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  • Q:

    What is the role of chloroplasts?

    A:

    Chloroplasts are the sites of photosynthesis in eukaryotic cells. They capture sunlight and store the light energy in the form of adenosine triphosphate and nicotinamide adenine dinucleotide phosphate molecules. Chloroplasts play a role in carbon fixation, fatty acid synthesis, amino acid synthesis and the immune response of plants.

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  • Q:

    Why don't onion cells have chloroplasts?

    A:

    Onion cells lack chloroplasts because the onion is part of the plant that is not involved in photosynthesis. The part of the plant eaten by humans is called the bulb, and it resides at the base of the plant. The bulb’s primary purpose is energy storage and holding the flower for the second growing season. Growing near the ground, the bulb is in poor position to collect sunlight.

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  • Q:

    What does a vacuole contain?

    A:

    A vacuole contains a fluid-filled sac that stores salts, water, minerals, nutrients, pigments and proteins within a membrane barrier called a tonoplast. Vacuoles can also contain waste products that make a plant taste bitter to animals.

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