Cell: The Unit of Life

NEET Biology · 161 questions · Page 2 of 17 · Click an option or "Show Solution" to reveal answer

Q11

Element necessary for the middle lamella is

A K

B Cu

C Ca

D Zn

Correct Answer

Option C

Solution

Middle lamella is the first formed layer, present between the two adjacent cells.

It is made up of calcium and magnesium pectate.

Q12

Proteinaceous pigment which control the activities concerned with light is

A Carotenoids

B Phytochrome

C Chlorophyll

D Anthocyanin

Correct Answer

Option B

Solution

Phytochrome is a plant pigment that can detect the presence or absence of light and is involved in regulating many processes linked to day length such as seed germination and initiation of flowering.

Q13

Lysosome contains :

A Reductive enzymes

B Oxidative enzymes

C Anabolic enzymes

D Hydrolytic enzymes

Correct Answer

Option D

Solution

A lysosome is a tiny sac bounded by a single unit membrane of lipoprotein containing glycoprotein hydrolytic enzymes called acid hydrolases including proteases, lipases, nucleases, glycosidases, sulphatases, acid phosphatases.

Q14

Which cell organelle is concerned with glycosylation of protein ?

A Endoplasmic reticulum

B Ribosome

C Mitochondria

D Peroxisome

Correct Answer

Option A

Solution

Glycosylation of protein means linking of sugars to proteins which starts in rough endoplasmic reticulum and completed in golgi complex.

Q15

A cell organelle containing hydrolytic enzymes is

A Ribosome

B Mesosome

C Lysosome

D Microsome

Correct Answer

Option C

Solution

Lysosomes are small vesicles which are bounded by a single membrane and contain hydrolytic enzymes.

Q16

Which one of the following cell organelles is enclosed by a single membrane?

A Mitochondria

B Chloroplasts

C Lysosomes

D Nuclei

Correct Answer

Option C

Solution

Double Membrane bound Organelles: Mitochondria, Chloroplasts, Endoplasmic Reticulum, Golgi Body, and Nucleus.

Single Membrane bound Organelles: Lysosomes, Peroxisomes, and Vacuoles.

Organelles lacking any membrane: Ribosomes, Centrioles, Nucleolus.

Q17

Non-membrane bound cell organelles found in both prokaryotic and eukaryotic cells are

\_\_\_\_

A Ribosomes

B Lysosomes

C Centrosomes

D Mitochondria

Correct Answer

Option A

Solution

Ribosome is a non-membrane bound cell organelle, found in both prokaryotic and eukaryotic cells.

Q18

Which one of the following is the site for active ribosomal RNA synthesis?

A Centrosome

B Chromatin

C Nucleolus

D Kinetochore

Correct Answer

Option C

Solution

Nucleolus is the site for active ribosomal RNA synthesis.

Q19

A specialised membranous structure in a prokaryotic cell which helps in cell well wall formation, DNA replication and respiration is

A Cristae

B Endoplasmic Reticulum

C Mesosome

D Chromatophores

Correct Answer

Option C

Solution

The correct answer is Mesosome (Option C).

Key points about mesosomes in prokaryotes: They are infoldings of the plasma membrane.

They house enzymes and machinery for: Cell-wall synthesis DNA replication and segregation Respiratory processes (electron transport) No other prokaryotic structure (cristae, ER or chromatophores) performs all three functions together.

Q20

Mesosome in a cell is a :

A Membrane bound vesicular structure

B Chain of many ribosomes attached to a single mRNA

C Special structure formed by extension of plasma membrane

D Medium sized chromosome

Correct Answer

Option C

Solution

Mesosomes are inward folds or invaginations of the plasma membrane in prokaryotic cells.

They are formed by extensions of the plasma membrane in prokaryotic cells.

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