Table of Contents
What is the function of thylakoid?
Thylakoids are the internal membranes of chloroplasts and cyanobacteria, and provide the platform for the light reactions of photosynthesis.
Do chloroplasts have thylakoids?
The Structure and Function of Chloroplasts In addition to the inner and outer membranes of the envelope, chloroplasts have a third internal membrane system, called the thylakoid membrane. The thylakoid membrane forms a network of flattened discs called thylakoids, which are frequently arranged in stacks called grana.
What are thylakoids and why are they important to photosynthesis?
A thylakoid is a sheet-like membrane-bound structure that is the site of the light-dependent photosynthesis reactions in chloroplasts and cyanobacteria. It is the site that contains the chlorophyll used to absorb light and use it for biochemical reactions.
What does the thylakoid contain?
Thylakoids are usually arranged in stacks (grana) and contain the photosynthetic pigment (chlorophyll). The grana are connected to other stacks by simple membranes (lamellae) within the stroma, the fluid proteinaceous portion containing the enzymes essential for the photosynthetic dark reaction, or Calvin cycle.
Do animal cells have thylakoids?
Plants and Animal Cells Inside of the chloroplast, we find an important structure: the thylakoid. It is inside this thylakoid that the magic happens in that we see the creation of food.
Is chlorophyll in the thylakoid?
The green pigment chlorophyll is located within the thylakoid membrane, and the space between the thylakoid and the chloroplast membranes is called the stroma (Figure 3, Figure 4).
What cell contains DNA?
nucleus
The nucleus contains most of the DNA in a cell and this DNA is called the chromosomal DNA. It is separated from the rest of the cell (cytoplasm) by a double layer of membrane….1. Which organelles contain DNA?
| Type of DNA | Organism | size in base pairs |
|---|---|---|
| chloroplast DNA | green alga | 180 x 103 |
Which cell contains cytoplasm?
In eukaryotic cells, the cytoplasm includes all of the material inside the cell and outside of the nucleus. All of the organelles in eukaryotic cells, such as the nucleus, endoplasmic reticulum, and mitochondria, are located in the cytoplasm.
What role does the thylakoid have in photosynthesis?
Photosynthesis occurs in the chloroplasts where the photosynthetic membranes, the so-called thylakoids are located. They are responsible for the light reaction whereby light is captured and its energy converted to chemical energy in the form of ATP and NADPH concomitant with the development of oxygen.
How are thylakoids different from animal and plant cells?
In both animal and plant cells, we find very similar organelles, but there are obviously differences between animal and plant cells. One is that animals lack a cell wall; another is that plants contain something called a chloroplast. Inside of the chloroplast, we find an important structure: the thylakoid.
Why do red blood cells have no DNA?
Mature red blood cells have no nucleus which is the compartment that houses the DNA. Immature red blood cells actually do have a nucleus but when they differentiate to become the mature red blood cells the nucleus is actually ejected, so they have no nucleus and no DNA.
What are the two reactions in the thylakoid membrane?
In the thylakoid membrane itself, two light reactions occur: photosystem I and II. In each photosystem there are different proteins and slightly different chlorophyll pigments that allow for different light absorption. The chlorophyll molecules act as giant antennas that collect the sun’s energy.
Why are red blood cells not able to divide?
Furthermore, red blood cells do not have an insulin receptor and thus their glucose uptake is not regulated by insulin. Because of the lack of nuclei and organelles, mature red blood cells do not contain DNA and cannot synthesize any RNA, and consequently cannot divide and have limited repair capabilities.