Cell: The Unit of Life

NEET Biology · 161 questions · Page 7 of 17 · Click an option or "Show Solution" to reveal answer

Q61

A major site for synthesis of lipids is :

A RER

B Nucleoplasm

C SER

D Symplast

Correct Answer

Option C

Solution

The smooth endoplasmic reticulum is the major site for synthesis of lipid.

In animal cells lipid like steroidal hormones are synthesised in SER.

Q62

Which one of the following structures is an organelle within an organelle ?

A Mesosome

B Peroxisome

C Ribosome

D ER

Correct Answer

Option C

Solution

Ribosomes are small naked (non membrane bound) particles made of rRNA and proteins.

Ribosomes are also seen in organelles like mitochondria and chloroplasts, making them organelles within an organelle.

Q63

Which one of the following cellular parts is correctly described ?

A Lysosomes - optimally active at a pH of about 8.5

B Centrioles - sites for active RNA synthesis

C Thylakoids - flattened membranous sacs forming the grana of chloroplasts

D Ribosomes - those on chloroplasts are larger (80s) while those in the cytoplasm are smaller (70s)

Correct Answer

Option C

Solution

Thylakoids are the flattened sac-like membranous structures that are stacked on top of one another to form the grana of plant chloroplast.

They are the site for the light-dependent reactions of photosynthesis.

Q64

Which one of the following does not differ in E.coli and Chlamydomonas ?

A Chromosomal Organization

B Cell wall

C Ribosomes

D Cell membrane

Correct Answer

Option D

Solution

E.coli (bacteria) is prokaryote while Chlamydomonas (algae) is eukaryote.

Ribosomes differ being 70S in prokaryotes and 80S in eukaryotes.

Cell membrane has similar organization in both groups.

Q65

What is true about ribosomes ?

A These are self - splicing introns of some RNAs.

B These are found only in eukaryotic cells

C There are composed of ribonucleic acid and proteins

D The prokaryotic ribosomes are 80 S, where S stands for sedimentation coefficient.

Correct Answer

Option C

Solution

Ribosomes are amembraneous cell organelle composed of rRNA and protein.

These are found in both prokaryotic and eukaryotic cells.

In prokaryotes, ribosomes are 70S type while in eukaryotes, it is 80S type.

Q66

Select the the correct statement from the following regarding cell membrane

A Na+ and K+ ions move across cell membrane by passive transport

B Lipids are arranged in bilayer with polar heads towards the inner part

C Proteins make up 60 to 70% of the cell membrane

D Fluid mosaic model of cell membrane was proposed by singer and Nicolson

Correct Answer

Option D

Solution

Fluid mosaic membrane model was proposed by Singer and Nicholson in 1972.

It is most accepted model of structure of biomembrane.

Q67

The inner membrane of mitochondria forms infoldings called cristae. Select the part correctly matched with its function.

A Part (B) : Inner membrane forms infoldings called cristae

B Part (C) : Cristae possess single circular DNA molecule and ribosome

C Part (A) : Matrix major site for respiratory chain enzymes

D Part (D) : Outer membrane gives rise to inner membrane by splitting

Correct Answer

Option A

Solution

The inner membrane forms a number of infoldings called the cristae towards the matrix.

The cristae increase the surface area.

The two membranes have their own specific enzymes associated with the mitochondrial function.

Q68

Which one of the following is not considered as a part of the endomembrane system ?

A Vacuole

B Lysosome

C Golgi complex

D Peroxisome

Correct Answer

Option D

Solution

Except peroxisome the remaining three and ER are the parts of endomembrane system.

Q69

Important site for formation of glycoproteins and glycolipids is :

A Plastid

B Lysosome

C Golgi apparatus

D Vacuole

Correct Answer

Option C

Solution

Golgi apparatus is the important site for formation of glycoprotein and glycolipid.

Q70

Peptide synthesis inside a cell takes place in :

A Chromoplast

B Ribosomes

C Chloroplast

D Mitochondria

Correct Answer

Option B

Solution

Peptide synthesis inside a cell takes place in ribosome.

Ribosomes are found in all cells and are involved in protein synthesis.

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