Recent questions in Cell Structure and Formation

ribosomes in prokaryotes are associated with

asked Mar 24, 2014 by pady_1

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1. Mycoplasma are a group of fungus. 2. They are devoid of cell walls 3. They are highly pleomorphic, with fixed shape and size.

asked Mar 20, 2014 by pady_1

1 answer

1. Bacteria show a range in the number and arrangement of flagella. 2. Bacterial flagellum is composed of three parts – filament, hook and basal body. 3. The filament is the longest portion and extends from the cell surface to the outside. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

1 answer

Which of the following statements is true about Glycocalyx?

asked Mar 20, 2014 by pady_1

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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

1 answer

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

1 answer

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

1 answer

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

1. Mycoplasma are a group of fungus. 2. They are devoid of cell walls 3. They are highly pleomorphic, with fixed shape and size.

asked Jan 6, 2014 by pady_1

1 answer

1. Bacteria show a range in the number and arrangement of flagella. 2. Bacterial flagellum is composed of three parts – filament, hook and basal body. 3. The filament is the longest portion and extends from the cell surface to the outside. Regarding 1,2 and 3:

asked Jan 6, 2014 by pady_1

1 answer

Glycocalyx :- 1. It is of same composition and thickness among different bacteria though it may differ whethe tightly or loosely attached. 2. It could be a loose sheath called the capsule in some 3. While in others it may be tightly bound and tough, called the slime layer. Regarding 1,2 and 3:

asked Jan 6, 2014 by pady_1

1 answer

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 Jan 6, 2014 by pady_1

1 answer

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 Jan 6, 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 Jan 6, 2014 by pady_1

1 answer

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 Jan 6, 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 Jan 6, 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 Jan 6, 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 Jan 6, 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 Jan 6, 2014 by pady_1

1 answer

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 Jan 6, 2014 by pady_1

1 answer

Mycoplasma is placed in

asked Jan 3, 2014 by pady_1

1 answer

Mycoplasma: Assertion (A): Mycoplasma can pass through bacterial filters Reason (R): Due to their plasticity Regarding (A) and (R):

asked Jan 3, 2014 by pady_1

1 answer

In Mycoplasma the cells are bounded by :

asked Jan 3, 2014 by pady_1

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The fimbriae are :

asked Jan 3, 2014 by pady_1

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The pili are :

asked Jan 3, 2014 by pady_1

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Choose the odd one out - regarding surface structures of the bacteria and their role in motility. :

asked Jan 3, 2014 by pady_1

1 answer

Choose the odd one out - regarding surface structures of the bacteria :

asked Jan 3, 2014 by pady_1

1 answer

Bacterial flagellum is composed of –

asked Jan 3, 2014 by pady_1

1 answer

Motile bacteria, they have thin filamentous extensions from their cell wall known as :

asked Jan 3, 2014 by pady_1

2 answers

1. Bacterial cells may be motile 2. Bacterial cells may be non-motile. Regarding 1 and 2 :

asked Jan 3, 2014 by pady_1

1 answer

In some prokaryotes : 1. There are membranous extensions into the cytoplasm called chromatophores 2. Chromatophores contain pigments. Regarding 1 and 2 :

asked Jan 3, 2014 by pady_1

1 answer

Mesosome help in respiration, secretion processes, to :

asked Jan 3, 2014 by pady_1

1 answer

Mesosome help in :

asked Jan 3, 2014 by pady_1

1 answer

Mesosome help in :

asked Jan 3, 2014 by pady_1

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Mesosome is formed by extensions of plasma membrane into the cell in the form of :

asked Jan 3, 2014 by pady_1

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The plasma membrane is :

asked Jan 3, 2014 by pady_1

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The cell wall :

asked Jan 3, 2014 by pady_1

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Gram stain : 1. Those that take up the gram stain are Gram positive 2. Those that do not are called Gram negative bacteria Regarding 1 and 2 :

asked Jan 3, 2014 by pady_1

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Bacteria can be classified into two groups - Gram positive and Gram negative on the basis of :

asked Jan 3, 2014 by pady_1

1 answer

Regarding prokaryotes and eukaryotes choose the incorrect option:

asked Jan 3, 2014 by pady_1

1 answer

Regarding plasmid DNA choose the incorrect option:

asked Jan 3, 2014 by pady_1

1 answer

Choose the odd one out :

asked Jan 3, 2014 by pady_1

1 answer

1. Cells of bacteria could be 30 to 50 μm in length. 2. The largest isolated single cell is the egg of an ostrich. Regarding 1 and 2 :

asked Jan 3, 2014 by pady_1

1 answer

$Na^+/k^+$ Pump is

asked Jan 3, 2014 by pady_1

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1. Animal and plant cells contain non-membrane bound organelle called centriole 2. Centriole helps in cell division. Regarding 1 and 2 :

asked Jan 3, 2014 by pady_1

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