Q. No.
As per fluid mosaic model, lipids and integral proteins can diffuse randomly. The model has been modified in several aspects. Which of the following statements is incorrect?
1. Protein of cell membrane can travel within lipid bilayer
2. Protein of cell membrane can undergo flip-flop movement in lipid bilayer
3. Protein can remain confined within certain domains of the membrane
4. Many proteins remain completely embedded within lipid bilayer
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Organelle involved in modification and routing of newly synthesised proteins to their destination is
1. Chloroplast
2. Lysosome
3. Mitochondrion
4. Endoplasmic reticulum
Which of the following statement about cilia is not correct?
1. Organised beating of cilia is controlled by fluxes of Ca2+ across the membrane.
2. Cilia are hair like cellular appendages.
3. Cilia contain an outer ring of nine doublet microtubules surrounding two singlet microtubules.
4. Microtubules of cilia are composed of tubulin.
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Which of the following statement regarding mitochondrial membrane is not correct?
1. Outer membrane resembles a sieve
2. Outer membrane is permeable to all kinds of molecules
3. Enzymes of electron transport chain are embedded in outer membrane
4. Inner membrane is highly convoluted, forming a series of infoldings
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Which of the following is not a constituent of cell membrane?
1. Glycolipids
2. Phospholipids
3. Cholesterol
4. Proline.
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Which of the following statements is wrong?
1. Both chloroplasts and mitochondria have an internal compartment or the thylakoid space bounded by the thylakoid membrane.
2. Both chloroplasts and mitochondria contain DNA.
3. The chloroplasts are generally much larger than mitochondria.
4. Both chloroplasts and mitochondria are covered by double membrane.
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The two subunits of ribosomes remain united at a critical ion level of
1. Magnesium
2. Calcium
3. Copper
4. Manganese
Polysome is formed by
1. A ribosome with several subunits
2. Ribosomes attached to each other in a linear arrangement
3. Several ribosomes attached to a single mRNA
4. Many ribosomes attached to a strand of endoplasmic reticulum
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Vacuole in a plant cell
1. Lacks membrane and contains air.
2. Lacks membrane and contains water and excretory substances.
3. Is membrane bound and contains storage proteins and lipids.
4. Is membrane bound and contains water and excretory substances.
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