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Biology
Cell: The Unit of Life
137 questions from 38 papers, each with its answer.
- 137 questions
- 38 papers
- 3.89% of Biology
Lysosomes
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Which one of the following cell organelles is enclosed by a single membrane?
Lysosomes have a single membrane.
The lysosome is a spherical organelle covered by a single membrane containing degradative enzymes ('suicidal bags'). The other organelles are double-membrane bound.
Cytoskeleton – microtubules
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Microtubules are the constituents of
Spindle fibres, centrioles and cilia are all built of microtubules.
The axoneme of cilia has nine pairs of peripheral microtubules arranged radially and a pair of central microtubules.
Microtubules are common constituents of spindle fibres, centrioles and cilia.
Semi-autonomous organelles – mitochondria and chloroplasts
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Mitochondria and chloroplast are I. semi-autonomous organelles. II. formed by the division of pre-existing organelles and they contain DNA but lack protein synthesising machinery. Which one of the following options is correct?
They have DNA and 70S ribosomes, so they do synthesise proteins.
Mitochondria and chloroplasts are called semi-autonomous organelles because they have their own DNA and 70S ribosomes.
They are formed by division of pre-existing organelles and can synthesise their own proteins, so statement II (lack protein-synthesising machinery) is false.
Ribosomes – polysome
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A complex of ribosomes attached to a single strand of RNA is known as
Many ribosomes on one mRNA = polysome.
Ribosomes are sites of protein synthesis. Several ribosomes attached to a single mRNA form a chain-like structure called a polyribosome or polysome.
Vacuole pigments – anthocyanins
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Water soluble pigments found in plant cell vacuoles are
Anthocyanins are water-soluble vacuolar pigments.
Anthocyanin is a water-soluble pigment found in vacuoles of plant cells. Its colour depends on the pH of the vacuolar fluid; it may be red, blue, purple or black.
That is every question in Cell: The Unit of Life for this filter.
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