Cell Biology Test

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Cell Biology Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

Sphaerosomes have affinity for

A
Sudan III

B
Eosin stains

C
Leishman’s stain

D
Giemso’s stains

Solution

Sphaerosoms are highly refractile and rich in fat (98%) and take black stain with sudan III/Osmium tetraoxide.
Question 2
1 / -0

Cell organelle known as “protein factory of the cell” is

A
Lysosome

B
Mitochondria

C
Golgi body

D
Ribosome

Solution

Ribosomes are called site of protein synthesis because tow sub‑units of ribosomes are attached with the thread of mRNA. This mRNA contains anticodes for protein synthesis.
Question 3
1 / -0

70S type of ribosome shows two units whose sedimentation constants are

A
40 S and 30 S

B
50 S and 20 S

C
50 S and 30 S

D
60 S and 20 S

Solution

70S types of ribosome are found in prokaryotic cells. They are made up of two units, 50 S (large unit) and 30 S (small unit).
Question 4
1 / -0

During ultracentrifugation the ER and bodies associated with it are separated as a fraction known as

A
Microsome

B
Polysome

C
Quantosome

D
Episome

Solution

Microsome is a particle in a particulate fraction that is obtained by heavy centrifugation of broken cells and consists of various amounts of ribosomes, fragmented endoplasmic reticulum, and mitochondrial cristae.
Question 5
1 / -0

The main difference between plant and animal cell is

A
Animal cells lack cell wall

B
Plant cell has no cell wall

C
Animal cell has a rigid cell wall

D
Plant cells lack cell membrane

Solution

Presence of the cell wall is the main characteristic of plant cell. It is absent in the animal cell.
Question 6
1 / -0

Telomere repetitive DNA sequences control the function of eukaryotic chromosomes because they

A
act as replicons

B
are RNA transcription initiator

C
help in chromosome pairing

D
prevent chromosome loss

Solution

Telomeres are the ends of chromosome having repetitive DNA sequences, are stable and resistant to exonuclease digestion. Hence, essential for the chromosome stability.
Question 7
1 / -0

Phragmoplast is

A
proplasted in cytoplasm of dividing cells

B
cell plate formed by vesicles ER and dictyosomes during cytokinesis

C
cell plate formed by ER, dictyosomes secretory vesicles and spindle fibre

D
None of the above

Solution

The phragmoplast is a plant cell specific structure that forms during late cytokinesis. It serves as a scaffold for cell plate assembly and subsequent formation of a new cell wall separating the two daughter cells. It is formed by ER, dictyosomes secretory vesicles and spindle fibre.
Question 8
1 / -0

Centromere is required for

A
transcription

B
crossing over

C
cytoplasmic cleavage

D
movement of chromosomes towards poles

Solution

The centrosome is the part of a chromosome that links sister chromatids or a dyad. It is required for movement of chromosomes towards poles.

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Cell Biology Test - 5

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Cell Biology Test - 5

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Question 1

Sudan III

Eosin stains

Leishman’s stain

Giemso’s stains

Solution

Question 2

Lysosome

Mitochondria

Golgi body

Ribosome

Solution

Question 3

40 S and 30 S

50 S and 20 S

50 S and 30 S

60 S and 20 S

Solution

Question 4

Microsome

Polysome

Quantosome

Episome

Solution

Question 5

Animal cells lack cell wall

Plant cell has no cell wall

Animal cell has a rigid cell wall

Plant cells lack cell membrane

Solution

Question 6

act as replicons

are RNA transcription initiator

help in chromosome pairing

prevent chromosome loss

Solution

Question 7

proplasted in cytoplasm of dividing cells

cell plate formed by vesicles ER and dictyosomes during cytokinesis

cell plate formed by ER, dictyosomes secretory vesicles and spindle fibre

None of the above

Solution

Question 8

transcription

crossing over

cytoplasmic cleavage

movement of chromosomes towards poles

Solution

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