Keeping in view the 'fluid mosaic model for the structure of cell membrane, which one of

the following statements is correct with respect to the movement of lipids and proteins

from one lipid monolayer to the other (described as flip-flop movement)?

1. Both lipids and proteins can flip-flop

2. While lipids can rarely flip-flop, proteins cannot

3. While proteins can flip-flop, lipids cannot

4. Neither lipids, nor proteins can flip-flop

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NEET 2022 - Target Batch - Aryan Raj Singh

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Polysome is formed by

1. several ribosomes attached to a single mRNA

2. many ribosomes attached to a strand of endoplasmic reticulum

3. a ribosome with several subunits 

4. ribosomes attached to each other in a linear arrangement

Subtopic:  Ribosome and Inclusion Bodies |
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The two subunits of ribosome remain united at a critical ion level of

1. copper

2. manganese

3. magnesium

4. calcium

Subtopic:  Ribosome and Inclusion Bodies |
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Vacuole in a plant cell

1. is membrane-bound and contains storage proteins and lipids

2. is membrane-bound and contains water and excretory substances

3. lacks membrane and contains air

4. lacks membrane and contains water and excretory substances

Subtopic:  Vacuole |
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In germinating seeds fatty acids are degraded exclusively in the

1. proplastids

2. glyoxysomes

3. peroxisomes

4. mitochondria

Subtopic:  Microbodies |
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Which one of the following is not a constituent of cell membrane ?

1. Cholesterol

2. Glycolipids

3. Proline

4. Phospholipids

Subtopic:  Cell Membrane |
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Lysozyme that is present in perspiration, saliva and tears, destroys:

1. certain fungi

2. certain types of bacteria

3. all viruses

4. most virus-infected cells

Subtopic:  Endomembrane System (Lysosomes) |
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Select the wrong statement from the following:

1. both chloroplasts and mitochondria contain an inner and an outer membrane

2. both chloroplasts and mitochondria have an internal compartment, the thylakoid

space bounded by the thylakoid membrane

3. both chloroplasts and mitochondria contain DNA

4. the chloroplasts are generally much larger than mitochondria

Subtopic:  Plastids | Mitochondria |
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Which of the following statements regarding mitochondrial membrane is not correct?

1. The outer membrane is permeable to all kinds of molecules

2. The enzymes of the electron transfer chain are embedded in the outer membrane

3. The inner membrane is highly convoluted forming a series of infoldings

4. The outer membrane resembles a sieve

Subtopic:  Mitochondria |
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A major breakthrough in the studies of cells came with the development of electron

microscope. This is because :

1. the resolution power of the electron microscope is much higher than that of the light

microscope

2. the resolving power of the electron microscope is 200 - 350 nm as compared to 0.1 -

0.2 nm for the light microscope

3. electron beam can pass through thick materials, whereas light microscopy requires

thin sections

4. the electron microscope is more powerful than the light microscope as it uses a beam

of electrons which has wavelength much longer than that of photons

Subtopic:  Introduction to Cell | Cell Theory |
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