Organelles, Membranes and Transport - Cell Structure and Function - Life Sciences Previous Year Questions

1

2007 · Life Sciences · Cell Structure and Function · Organelles, Membranes and Transport

Life Sciences (XL) 2007

Which of the following statements are true in case of fluid-mosaic model cell membranes.
P   Between 5-8 nm thick and appear trilaminar when viewed in cross section under electron microscope
Q   Less than 1 nm thick and consist of a layer of protein sandwitched between two layers of phospholipids
R   In the lipid bilayer, proteins are embedded at irregular intervals and held by hydrophilic interactions between lipids and hydrophilic domains of the proteins
S   The protein domains exposed on one side of the lipid bilayer are different from those exposed on the other side

A

P, Q

B

P, S

C

Q, S

D

P, R

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2

2008 · Life Sciences · Cell Structure and Function · Organelles, Membranes and Transport

Life Sciences (XL) 2008

Match the function in Column I with organelle in Column II

A

P-3, Q-2, R-1

B

P-1, Q-3, R-2

C

P-1, Q-4, R-3

D

P-4, Q-1, R-2

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3

2008 · Life Sciences · Cell Structure and Function · Organelles, Membranes and Transport

Life Sciences (XL) 2008

The cellular environment is maintained by generating a gradient and transporting the Na⁺ outside the cell through

A

diffusion process

B

passive transport via Na⁺-K⁺ pump

C

active transport via Na⁺-K⁺ pump

D

sodium ions not be transported

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4

2009 · Life Sciences · Cell Structure and Function · Organelles, Membranes and Transport

Life Sciences (XL) 2009

Lactose uptake in E. coli is an example of

A

Passive transport

B

Primary active transport

C

Secondary active transport

D

Simple diffusion

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5

2009 · Life Sciences · Cell Structure and Function · Organelles, Membranes and Transport

Life Sciences (XL) 2009

During receptor-mediated endocytosis of LDL bound to its receptor

A

Both receptor and ligand are degraded.

B

The receptor is degraded and the ligand is recycled.

C

Both are recycled.

D

The ligand is degraded and the receptor is recycled.

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6

2009 · Life Sciences · Cell Structure and Function · Organelles, Membranes and Transport

Life Sciences (XL) 2009

What property of biomembranes is responsible for their self-sealing nature ?

A

Hydrophilicity of the phospholipid head group

B

Presence of proteins in biomembranes

C

Presence of cholesterol in biomembranes

D

Hydrophobicity of the fatty acid side chains of phospholipids

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7

2010 · Life Sciences · Cell Structure and Function · Organelles, Membranes and Transport

Life Sciences (XL) 2010

Match the proteins in Group 1 with their correct functions in Group 2

Group 1	Group 2
P. Shaker protein	1. Inner membrane receptor
Q. Bacteriorhodopsin	2. Active transport
R. Porin	3. Voltage gated K⁺ channel
S. ABC transporter	4. Light driven H⁺ pump
	5. Membrane fusion
	6. β-barrel simple diffusion channel

A

P-4, Q-2, R-3, S-5

B

P-5, Q-3, R-4, S-6

C

P-6, Q-1, R-5, S-4

D

P-3, Q-4, R-6, S-2

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8

2010 · Life Sciences · Cell Structure and Function · Organelles, Membranes and Transport

Life Sciences (XL) 2010

An electron microscope has higher resolution as compared to the light microscope. This is because

A

the wavelength of an electron is longer than the wavelength of light

B

the wavelength of an electron is shorter than the wavelength of light

C

the electrons can penetrate the sample better

D

they use different stains

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9

2011 · Life Sciences · Cell Structure and Function · Organelles, Membranes and Transport

Life Sciences (XL) 2011

Valinomycin, a cyclic peptide antibiotic, facilitates the transport of which one of the following ions?

A

K⁺

B

Ca²⁺

C

Na⁺

D

H⁺

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10

2011 · Life Sciences · Cell Structure and Function · Organelles, Membranes and Transport

Life Sciences (XL) 2011

The active transport of solute in the cell is characterized by

A

its uptake along the concentration gradient utilizing energy

B

requirement of a carrier to support transport along the concentration gradient

C

chemical modification of the solute during its uptake

D

its uptake against the concentration gradient

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11

2012 · Life Sciences · Cell Structure and Function · Organelles, Membranes and Transport

Life Sciences (XL) 2012

Upon stimulation of a eukaryotic cell, the intracellular calcium (Ca²⁺) is released from

A

Endoplasmic reticulum

B

Nucleus

C

Peroxisome

D

Mitochondria

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12

2012 · Life Sciences · Cell Structure and Function · Organelles, Membranes and Transport

Life Sciences (XL) 2012

Golgi apparatus is also termed as cellular post office, since it packages and transports cellular proteins across various organelles and outside the cell. In general, the Golgi is perinuclear in location and is closely associated with the endoplasmic reticulum. A chemical compound, Monensin inhibits all trafficking from Golgi. If Golgi is visualized by immunofluorescence microscopy after treatment with this compound, the Golgi will be

A

absent

B

normal

C

swollen

D

fragmented

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13

2013 · Life Sciences · Cell Structure and Function · Organelles, Membranes and Transport

Life Sciences (XL) 2013

Which one of the following statements is TRUE when a cell is kept in a hypotonic solution?

A

Water moves out of the cell

B

Size of the cell remains same

C

No movement of water takes place

D

Size of the cell increases

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14

2013 · Life Sciences · Cell Structure and Function · Organelles, Membranes and Transport

Life Sciences (XL) 2013

Arrange the following in the decreasing order of their permeability coefficients across a lipid bilayer membrane.
(i) Urea
(ii) Glucose
(iii) H₂O
(iv) Na⁺
(v) Tryptophan

A

(i), (iii), (v), (ii), (iv)

B

(iii), (v), (ii), (iv), (i)

C

(iii), (i), (v), (ii), (iv)

D

(i), (iii), (iv), (v), (ii)

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15

2013 · Life Sciences · Cell Structure and Function · Organelles, Membranes and Transport

Life Sciences (XL) 2013

If the radius of a spherical coccus is 0.8 μm, the value of \(\frac{surface\ area}{volume}\) in μm⁻¹ will be

A

7.45

B

4.05

C

3.75

D

0.85

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16

2013 · Life Sciences · Cell Structure and Function · Organelles, Membranes and Transport

Life Sciences (XL) 2013

Match the microscopes in Group I with their working principles in Group II

Group I	Group II
P. Phase contrast	I. Light reaches the specimen only from the sides
Q. Dark field	II. Uses fluorescent dyes
R. Bright field	III. Difference in the refractive index of cells from their surrounding medium
S. Electron microscopy	IV. Difference in contrast between specimen and its surrounding medium
	V. Uses electrons instead of photons as energy source

A

P-V, Q-II, R-III, S-V

B

P-III, Q-I, R-IV, S-V

C

P-III, Q-II, R-V, S-I

D

P-II, Q-I, R-III, S-V

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17

2013 · Life Sciences · Cell Structure and Function · Organelles, Membranes and Transport

Life Sciences (XL) 2013

Among the following cell structure-function pairs, identify the correctly paired one

A

Microvilli – engulfment of foreign bodies

B

Cytoskeleton – cell migration

C

Peroxisomes – cellular respiration

D

Nucleolus – mRNA transcription

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18

2014 · Life Sciences · Cell Structure and Function · Organelles, Membranes and Transport

Life Sciences (XL) 2014

Given below is the hydropathy plot of a monomeric transmembrane protein.
How many transmembrane α-helices are present in the protein?

A

1

B

2

C

4

D

5

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19

2014 · Life Sciences · Cell Structure and Function · Organelles, Membranes and Transport

Life Sciences (XL) 2014

Transmission Electron Micrograph of fungal cell can usually be distinguished from plant cell due to lack of P and having less abundant Q. Find the correct combination of P and Q.

A

P- Plastid; Q-Vacuoles

B

P- Plastid; Q-Mitochondria

C

P- Plastid; Q-Endoplasmic reticulum

D

P- Mitochondria; Q-Plastid

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20

2014 · Life Sciences · Cell Structure and Function · Organelles, Membranes and Transport

Life Sciences (XL) 2014

Regions of higher abundance of cholesterol molecules on the plasma membrane will

A

be more fluid

B

result in clogged arteries as it can detach from the plasma membrane

C

be more rigid than the surrounding membrane

D

have higher rates of lateral movement of proteins into and out of plasma membrane

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