Cell: The Unit of Life

NEET Biology · 161 questions · Page 13 of 17 · Click an option or "Show Solution" to reveal answer

Q121

Nuclear envelope is a derivative of :

A Membrane of Golgi complex

B Smooth endoplasmic reticulum

C Rough endoplasmic reticulum

D Microtubules

Correct Answer

Option C

Solution

In late prophase, nuclear envelope disappears and reappears in late telophase from rough endoplasmic reticulum (RER).

Q122

Select the correct matching in the following pairs :

A Rough ER – Oxidation of fatty acids

B Smooth ER – Oxidation of phospholipids

C Rough ER – Synthesis of glycogen

D Smooth ER – Synthesis of lipids

Correct Answer

Option D

Solution

Smooth endoplasmic reticulum (SER) is a system of smooth membranes within the cytoplasm of plant and animal cells.

It is the site of important metabolic reactions, including phospholipid and fatty acid synthesis.

Q123

Which one of the following is not an inclusion body found in prokaryotes?

A Cyanophycean granule

B Phosphate granule

C Polysome

D Glycogen granule

Correct Answer

Option C

Solution

Polysomes are found in eukaryotes and are defined as a cluster of ribosomes attached to a mRNA molecule.

Q124

The structures that are formed by stacking of organized flattened membranous sacs in the chloroplasts are

A Stroma lamellae

B Cristae

C Stroma

D Grana

Correct Answer

Option D

Solution

A chloroplast is a vesicle, bound by an envelope of two unit membranes and filled with a fluid matrix called stroma.

The lamellae, after separation from the inner membrane, usually take the form of closed, flattened, ovoid sacs, the thylakoids, which lie closely packed in piles, the grana.

Q125

The osmotic expansion of a cell kept in water is chiefly regulated by:

A Vacuoles

B Plastids

C Mitochondria

D Ribosomes

Correct Answer

Option A

Solution

The vacuole is bound by a single membrane called tonoplast.

It also functions as semipermeable membrane.

It segregates vacuolar contents from cytoplasm, allows osmotic entry or exit of water, concentration and storage of nutrients as well as wastes.

Q126

Which one of the following is not a constituent of cell membrane ?

A Glycolipids

B Proline

C Phospholipids

D Cholesterol

Correct Answer

Option B

Solution

Chemically a biomembrane consists of lipids (20-70%), proteins (20-70%), carbohydrates (1-5%) and water (20%).

The important lipids of the membrane are phospholipids, sterols (e.g. cholesterol), glycolipids.

Q127

Biological organization starts with:-

A Cellular level

B Atomic level

C Organismic level

D Submicroscopic molecular level

Correct Answer

Option D

Solution

Biological organisms starts with submicroscopic moleculer level like viruses, bacteria etc.

Q128

Which of the following statements regarding mitochondrial membrane is not correct ?

A The inner membrane is highly convoluted forming a series of infoldings

B The outer membrane resembles a sieve

C The outer membrane is permeable to all kinds of molecules

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

Correct Answer

Option D

Solution

The enzymes of electron transport system are present in inner mitochondrial membrane

Q129

Which of the following statements regarding cilia is not correct ?

A Microtubules of cilia are composed of tubulin

B The organized beating of cilia is controlled by fluxes of Ca 2+ across the membrane

C Cilia are hair-like cellular appendages

D Cilin contain an outer ring of nine doublet microtubules surrounding two single microtubules

Correct Answer

Option B

Solution

Eukaryotic cilia are made up of tubulin protein.

Cilia have a core of 2 microtubules and around there are 9 doublet microtubules.

Q130

Centromere is required for -

A Crossing over

B Movement of chromosomes towards poles

C Transcription

D Cytoplasmic cleavage

Correct Answer

Option B

Solution

During anaphase APC (anaphase promoting complex) develops.

It degenerates proteins binding the two chromatids in the region of centromere.

As a result, the centromere of each chromosome divides.

This converts the two chromatids into daughter chromosomes.

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