Cell The Unit of Life Test

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Cell The Unit of Life Test - 74

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Weekly Quiz Competition

Question 1
1 / -0

Match column I with column II and select the correct option from the codes given below.
Column I Column II
A. RER (i) Intracellular and extracellular digestion
B. SER (ii) Lipid synthesis
C. Golgi complex (iii) Protein synthesis and secretion
D. Lysosomes (iv) Moves materials out of the cell

A
$$A - (iii), B - (ii), C - (iv), D - (i)$$

B
$$A - (ii), B - (iii), C - (iv), D - (i)$$

C
$$A - (i), B - (iii), C - (ii), D - (iv)$$

D
$$A - (iv), B - (ii), C - (iii), D - (i)$$

Solution

(A) RER - Protein synthesis and secretion
(B) SER - Lipid synthesis
(C) Golgi complex - Moves materials out of the cell
(D) Lysosomes - Intracellular and extracellular digestion
So, the correct answer is (a).
Question 2
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What does $$A, B$$ and $$C$$ represent in the given figure of a chromosome?

A
A - Centriole, B - Satellite, C - Primary constriction

B
A - Centriole, B - Satellite, C - Secondary constriction

C
A - Centromere, B - Satellite, C - Secondary constriction

D
A - Centromere, B - Satellite, C - Primary constriction

Solution

Centromere is a non-stainable area, also called as primary constriction. Secondary constrictions are narrower than the primary constriction. These are necessary for the formation of nucleolus (which is formed in the post mitotic reconstruction phase). The area of a chromosomes distal to the nucleolar organiser is called satellite or trabant. The presence or formation of satellite is called satellitism. Satellite may be small and knob like. A chromosome having satellite is called as sat chromosome.
So, the correct answer is 'A - Centromere, B - Satellite, C - Secondary constriction'.
Question 3
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How does a cell get rid of defective or malfunctioning organelles by itself?

A
They are engulfed by plastids and stored until export from cell is possible

B
Defective parts accumulate until the cell itself dies

C
They are exported by exocytosis

D
Lysosomes assist in the removal of defective organelles by digesting them

Solution

The lysosomes may be called "suicide bags" of the cell in view of their autolytic role, or "disposal units" of the cell because they digest the incoming food materials and remove the foreign bodies, toxic molecules, and debris; or "recycling centres" as they break down worn out and defective cells and cell organelles to component molecules for building new organelles and cells.
So, the correct answer is 'Lysosomes assist in the removal of defective organelles by digesting them'.
Question 4
1 / -0

Ribosomes are composed by

A
RNA only

B
Proteins only

C
RNA and proteins

D
RNA, proteins and DNA

Solution

Ribosomes, protein synthesis cell organelles, are composed by 'RNA and proteins'.
So, the correct option is RNA, and proteins'.
Question 5
1 / -0

Which of the following statements is incorrect?

A
Mitochondria, unless specifically stained are not easily visible under the microscope.

B
Physiological activity of cells determines the number of mitochondria per cell.

C
Mitochondrion, a powerhouse of cells has DNA, RNA, ribosomes, and enzymes, so it can survive outside the cell.

D
Mitochondria divide by fission.
Solution
Semi-autonomy of mitochondria is because they have their own DNA which can replicate independently.
The mitochondrial matrix possesses its own ribosomes ($$70S$$ in nature). It synthesizes some of its own structural proteins and enzymes.
New mitochondria, developed by the division of pre-existing mitochondria.
So, the correct answer is option C.
Question 6
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Mark the mismatched pair.

A
Amyloplast - Store protein granule

B
Elaioplast - Store oils or fats

C
Chloroplasts - Contain chlorophyll pigments

D
Chromoplasts - Contain colour pigments other than chlorophyll

Solution

Amyloplasts are no pigmented organelles found in some plant cells. They are responsible for synthesis and storage of starch granules, through polymerisation of glucose.
Question 7
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Select one which is not true for ribosomes?

A
Made of two subunits

B
Form polysome

C
May attach of mRNA

D
Have no role in protein synthesis

Solution

Ribosomes are cell organelles that are formed of two subunits. Cytosolic eukaryotic ribosomes $$(80S)$$ are made up of $$60S$$ and $$40S$$ subunits, while prokaryotic ribosomes $$(70S)$$ are made up of $$50S$$ and $$30S$$ subunits.
They are also capable of forming polyribosomes during which many ribosomes are attached to $$mRNA$$. The purpose of ribosomes moving on mRNA is to synthesise proteins i.e., translation. Indeed, ribosomes have a very direct role in protein synthesis.
So, the correct answer is 'Have no role in protein synthesis'.
Question 8
1 / -0

Which of the following is not a function of the cytoskeleton in a cell?

A
Intracellular transport

B
Maintenance of cell shape and structure

C
Support of the organelles

D
Cell motility

E
None of the above

Solution

Cytoskeletal structures occur only in eukaryotic cells. They are externally minute, fibrous and tubular structures which maintain cell shape and support the organelles. They also help in intracellular transport.
So, the correct answer is 'None of the above'.
Question 9
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If you remove the fimbriae from the bacterial cell, which of the following would you expect to happen?

A
The bacteria could no longer swim

B
The bacteria would not adhere to the host tissue

C
Transportation of molecules across the membrane would stop

D
The shape of bacteria would change

Solution

Fimbriae are hair like structures present in large number in bacterias. They help in attaching bacteria to solid surfaces or host tissues.
Question 10
1 / -0

As they release hydrolase that digest old and damaged cells, the term suicide bags is used by cell biologists for __________.

A
Golgi bodies

B
lysosomes

C
glypxysomes

D
peroxisomes

Solution

The lysosomes may be called "suicide bags" of the cell in view of their autolytic role, or "disposal units" of the cell because they digest the incoming food materials and remove the foreign bodies, toxic molecules, and debris; or "recycling centres" as they break down warn out and defective cells and cell organelles to component molecules for building new organelles and cells.

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Re-Attempt Weekly Quiz Competition

Column I	Column II
A. RER	(i) Intracellular and extracellular digestion
B. SER	(ii) Lipid synthesis
C. Golgi complex	(iii) Protein synthesis and secretion
D. Lysosomes	(iv) Moves materials out of the cell

Cell The Unit of Life Test - 74

Result

Cell The Unit of Life Test - 74

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SHARING IS CARING

Question 1

$$A - (iii), B - (ii), C - (iv), D - (i)$$

$$A - (ii), B - (iii), C - (iv), D - (i)$$

$$A - (i), B - (iii), C - (ii), D - (iv)$$

$$A - (iv), B - (ii), C - (iii), D - (i)$$

Solution

Question 2

A - Centriole, B - Satellite, C - Primary constriction

A - Centriole, B - Satellite, C - Secondary constriction

A - Centromere, B - Satellite, C - Secondary constriction

A - Centromere, B - Satellite, C - Primary constriction

Solution

Question 3

They are engulfed by plastids and stored until export from cell is possible

Defective parts accumulate until the cell itself dies

They are exported by exocytosis

Lysosomes assist in the removal of defective organelles by digesting them

Solution

Question 4

RNA only

Proteins only

RNA and proteins

RNA, proteins and DNA

Solution

Question 5

Mitochondria, unless specifically stained are not easily visible under the microscope.

Physiological activity of cells determines the number of mitochondria per cell.

Mitochondrion, a powerhouse of cells has DNA, RNA, ribosomes, and enzymes, so it can survive outside the cell.

Mitochondria divide by fission.

Solution

Question 6

Amyloplast - Store protein granule

Elaioplast - Store oils or fats

Chloroplasts - Contain chlorophyll pigments

Chromoplasts - Contain colour pigments other than chlorophyll

Solution

Question 7

Made of two subunits

Form polysome

May attach of mRNA

Have no role in protein synthesis

Solution

Question 8

Intracellular transport

Maintenance of cell shape and structure

Support of the organelles

Cell motility

None of the above

Solution

Question 9

The bacteria could no longer swim

The bacteria would not adhere to the host tissue

Transportation of molecules across the membrane would stop

The shape of bacteria would change

Solution

Question 10

Golgi bodies

lysosomes

glypxysomes

peroxisomes

Solution

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