According to endosymbiotic theory, the chloroplast evolved as a result of engulfment and assimilation of a Cyanobacteria by an eukaryotic cell.
Explanation:
- Endosymbiotic theory supports the view that ceratain organelles of the eukaryotic cell evolved as a result of engulfment of single celled organism.
- Evidences that support this theory is the presence of organellar DNA.
- It is assumed that Mitochondria evolved as a result of engulfment and assimilation of an aerobic prokaryote while Chloroplast evolved due to engulfment and assimilation of a photosythetic prokaryote by an Eukaryote.
- After the engulfment ,these organisms however escaped the phagocytosis and began to benefit the eukaryotic Host.
- Soon it lost many of its Genes to the eukaryotic nucleus and became dependent on the Host.
- Thus a symbiotic association was established between the prokaryote and the host.Giving rise to cell organelles.
Bacteria is not eukaryotic
Echinoderms have radial symmetry.
The building block of nucleic acids are nucleotides. These consist of sugar, a phosphate, and a nitrogenous base.
Answer: we classify organisms to group living beings who share the same characteristics or who have common attributes
Explanation: So, since the late '60s and based on the proposal of the researcher Robert Whittaker, most biologists group living beings into 5 large groups called Kingdoms, based mainly on three characteristics:
* type of cell,
* number of cells in each organism and
* the way of obtaining energy.
As a result, we could have 5 kingdoms; and these kingdoms are:
Monera, represented by the microorganisms of prokaryotic type known colloquially as "bacteria"
-Fungi, represented by mushrooms
-Plantae, the kingdom of the plants
-Animalia, the kingdom of the animals, and
-Protist, a very diverse group of organisms of eukaryotic type.
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I hope it is useful. regards. Maria
