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Recent questions tagged cell structure and function

1. Prokaryotes and unicellilar eukaryotes have something unique in the form of inclusions. 2. A specialised differentiated form of cell membrane called mesosome is the characteristic of prokaryotes. 3. They are essentially aggregations of cytoplasmic proteins. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

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Prokaryotes: 1. Most prokaryotes do not have a cell wall. 2. The fluid matrix filling the cell is the cytoplasm. 3. There is no well-defined nucleus. 4. The genetic material is basically naked, not enveloped by a nuclear membrane. Regarding 1,2,3 and 4:

asked Mar 20, 2014 by pady_1

1 answer

1. Prokaryotic cells are generally smaller 2. Thet multiply more rapidly than the eukaryotic cells. 3. They may vary greatly in shape and size. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

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1. Human red blood cells are about 11.0 μm in diameter. 2. Nerve cells are some of the largest cells. 3. Cells also vary greatly in their shape; they may be disc-like, polygonal, columnar, cuboid, thread like, or even irregular. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

1 answer

1. Nucleus is a dense membrane bound structure. 2. Nucleus contains the chromosomes 3. Chromosomes in turn contain the genetic material, DNA. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

1 answer

1. The onion cell is a typical plant cell 2. It has a distinct cell wall as its outer boundary 3. Cell wall is just within the cell membrane. 4. The cells of the human cheek have an outer membrane as the delimiting structure of the cell. Regarding 1,2,3 and 4:

asked Mar 20, 2014 by pady_1

1 answer

CELL THEORY : 1. Rudolf Virchow first explained that cells divided 2. He explained that new cells are formed from pre-existing cells (Omnis cellula-e cellula). 3. He modified the hypothesis of Schleiden and Schwann to give the cell theory a final shape. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

1 answer

CELL THEORY : 1. Matthias Schleiden, a German botanist observed that all plants are composed of different kinds of cells which form the tissues of the plant. 2. Theodore Schwann (1839), a British Zoologist, studied different types of animal cells and reported that cells had a thin outer layer (‘plasma membrane’). 3. Theodore Schwann also concluded that the presence of cell wall is a unique character of the plant cells. 4. Schwann proposed the hypothesis that the bodies of animals and plants are composed of cells and products of cells. Regarding 1,2,3 and 4:

asked Mar 20, 2014 by pady_1

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Regarding G.N. RAMACHANDRAN: 1. He was the founder of the ‘Madras school’ of conformational analysis of biopolymers. 2. His discovery of the triple helical structure of collagen published in Nature in 1954 3. His analysis of the allowed conformations of proteins through the use of the ‘Ramachandran plot’ rank among the most outstanding contributions in structural biology. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

1 answer

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