Mitochondria and chloroplast are believed to be bacterial endosymbiont because

I. they have self nucleic acid i.e., circular ds, DNA and RNAs

II. 70s ribosomes

III. their membrane resembles that of bacteria

IV. ETS and ATP forming machinery is present.

(1) I and II

(2) I, II and III

(3) All of these

(4) I and IV

Subtopic:  Mitochondria |
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If a biochemical analysis of mitochondria has to be done, the best procedure would be

(1) select cells which have a larger number of mitochondria

(2) plasmolyse the cell and filter out the mixture and take the debris

(3) grind the cells and filter out the mixture and take the debris

(4) subject the cell to cell fractionation (centrifuge) and obtain mitochondria

Subtopic:  Mitochondria |
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Which one of the following structure is an organelle within an organelle?

(1) Ribosome

(2) Peroxysome

(3) ER

(4) Mesosome

Subtopic:  Eukaryotic Cell Orgenelle |
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SER and RER can be distinguished with its presence in

(1) protein synthesising cells

(2) protein and fat synthesising cells

(3) carbohydrates and fat synthesising cells

(4) lipid and protein synthesising cells

Subtopic:  Endomembrane System (Endoplasmic Reticulum) |
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Fluid mosaic model of plasma membrane was given by

(1) Robertson

(2) Robert Hooke

(3) Singer and Nicholson

(4) Gorter and Grendel

Subtopic:  Evidence for Fluidic Nature of Membrane |
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The percentage of cell surface that is impenetrable for ions is

(1) 1 %

(2) 99.9 %

(3) 90 %

(4) 73 %

Subtopic:  Cell Membrane |
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The property of semipermeability belongs to

(1) cell wall

(2) plasma membrane

(3) mitochondria only

(4) None of the above

Subtopic:  Cell Wall |
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Microtubules are absent in

(1) mitochondria

(2) flagella

(3) spindle fibres

(4) centriole

Subtopic:  Cytoskeleton |
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Which of the following four cell structures is correctly matched with the accompanying description?

(1) Plasma membrane - Outer layer of cellulose or chitin, or absent

(2) Mitochondria - Bacteria like elements with inner membrane forming sacs containing chlorophyll, found in plant cells and algae

(3) Chloroplasts - Bacteria like elements with inner membrane highly folded

(4) Golgi apparatus - Stacks of flattened vesicles

Subtopic:  Eukaryotic Cell Orgenelle |
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Which one of the following is incorrect statement

(1) All organisms are composed of cells

(2) Cell is the basic unit of life

(3) All inanimate things are made up of cells

(4) Virus is acellular

Subtopic:  Cell Theory |
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