See Section 27.1: How Did the E A prokaryotic cell with a firm that cell wall is
ID: 140812 • Letter: S
Question
See Section 27.1: How Did the E A prokaryotic cell with a firm that cell wall is limited in how large it can grow. A eukaryotic cell, with a flexible cell membrane, is able to grow much larger. The primary reason for this is the flexible cell membrane in a eukaryotic cell allows for infolding, increasing surface area there are no surface area-to-volume constraints on a eukaryotic cell. eukaryotic cells have mitochondria, which require the cell to be larger eukaryotic cells have a cytoskeleton, which allows for a smaller surface area-to-volume ratio eukaryotic cells need to be large to accommodate food vacuoles s See Section 27.1: How Did the Eukaryotic Cell Arise?Explanation / Answer
27] Correct answer is a flexible cell membrane in eukaryotic cells allows for infolding, increasing surface area and eukaryotic cells have a cytoskeleton, which allows for smaller surface area to volume ratio.
Eukaryotic cells have a 'true- nucleus', that is, a membrane-bound nucleus and membrane-bound organelles. These cells evolved about 2 million years after the prokaryotes formed from the components available on our earth. Cell walls may or may not be present in these cells. If present, the cell wall is generally composed of cellulose or chitin. Eukaryotic cells are found in fungi, some algae, protozoa, plants and animals.
It is widely believed that endosymbiosis played a major role in the evolution of eukaryotes. Cellular organelles like mitochondria and plastids are two such examples. That they have their own genomic material further stresses this theory. It is believed that some form of bacteria or primitive cells began to live as endosymbionts in other cells and gradually took the shape and function of the mitochondra and plastids.
Genomic analyses have also given rise to the hypothesis that the origin and evolution of eukaryotic cells was a result of symbiotic merger of two or more cells.
The oldest eukaryotic evidence is of about 2.7 billion years ago whle the prokaryotes are believed to have orignated about 3.8 billion years ago.
Gradually, over mllions of years, the transformation of prokaryotes into eukaryotes took place either by endosymbiosis or by merger of smaller prokaryotic cells.