Cell The Unit of Life Test

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Cell The Unit of Life Test - 76

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Weekly Quiz Competition

Question 1
1 / -0

Select one which is not true for ribosomes.

A
Made of two subunits

B
Form polysome

C
May attach to mRNA

D
Have on 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 on role in protein synthesis'.
Question 2
1 / -0

Ribosomes are composed of

A
RNA only

B
Proteins only

C
RNA and proteins

D
RNA, proteins and DNA

Solution

Ribosomes are made up of ribosomal proteins and ribosomal RNA (rRNA). Ribosomes are usually made up of three or four rRNA molecules and anywhere from about 40 to 80 different ribosomal proteins. Each ribosome is composed of two subunits, a larger one and a smaller one, each of which has a characteristic shape.
Thus the correct answer is C.
Question 3
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

RER stands for Rough Endoplasmic Reticulum. It is involved in protein synthesis and secretion. SER stands for Smooth Endoplasmic Reticulum which is involved in lipid synthesis. Golgi complex lives in close association with ER and takes number of proteins synthesised by ribosomes on ER wich gets modified in golgi and moves outside the cell. Lysosomes involved in digestion of these materials .
So, the correct option is 'Option A' .
Question 4
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Match column I with column II and select the correct option from the codes given below
Column I Column II
(A) Dictyosomes (i) Storage
(B) Mitochondria (ii) Photosynthesis
(C) Vacuoles (iii) Transport
(D) Grana (iv) Secretion
(v) Respiration

A
A- (iv); B- (v); C- (i); D- (ii)

B
A- (i); B- (ii); C- (iv); D- (iii)

C
A- (iv); B- (i); C- (ii); D- (iii)

D
A- (i); B- (ii); C- (iii); D- (iv)
Solution
- Dictyosomes is the other name of golgi body which is involved in secretion of substances.
- Mitochondria are the site of aerobic respiration .
- Vacuoles are the structure found in the cytoplasm and stores excretory products, water and sap .
- Grana are the integral thylakoids which are responsible for photosynthesis.
- So, the correct option is 'Option A' .
Question 5
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Match the cell organelles given in column I with cellular processes in column II and select the correct option from the codes given below:
Column I Column II
(A) Lysosomes (i) Protein synthesis
(B) Ribosomes (ii) Hydrolytic activity
(C) Smooth endoplasmic (iii) Steroid synthesis
(D) Centriole (iv) Formation of spindle

A
A- (ii); B- (i); C- (iii); D- (iv)

B
A- (i); B- (iii); C- (iv); D- (ii)

C
A- (i); B- (iv); C- (iii); D- (ii)

D
A- (iv); B- (iii); C- (i); D- (ii)
Solution
- These are the cell organelles involved in their respective function. Lysosomes are the membrane bound vesicular structures containing hydrolytic enzymes which optimally active at acidic pH. That's why the lysosomes are also called as Suicidal bags.
- Ribosomes are responsible for protein synthesis.
- Smooth endoplasmic reticulum are involved in synthesis of steroid hormones in an animal cell.
- Centriole forms the basal body of cilia and spindle fibres that give rise to spindle apparatus during cell divisions in animal cell .
- So, the correct option is 'Option A' .
Question 6
1 / -0

Ribosomes are synthesised in

A
Nucleolus

B
Cytoplasm

C
Mitochondria

D
Golgi complex

Solution

Ribosomes are known as protein factories because they are the main site of protein synthesis.
They are composed of ribonucleic acids and proteins.
The eukaryotic ribosomes are the 80S type (with 60S- large subunit and 40S- small subunit.
In a eukaryotic cell, ribosome synthesis takes place both in the cytoplasm of the cell as well as in the nucleolus present within the cell nucleus.
The genes that codes for ribosomal proteins are transcribed in the cytoplasm and are then transported to the nucleolus,
In the nucleolus, the transcription and processing of rRNA take place and it also helps in assembling the ribosome.
So, the correct answer is 'Nucleolus'.
Question 7
1 / -0

Select the incorrect pair.

A
Cell wall- structural support

B
Central vacuole- Storage

C
Amyloplast- Starch storage

D
Plasmodesmata- Protection
Solution
Correct Answer: D
Explanation:
Plasmodesmata can be defined as the thin thread of cytoplasm that is built across two adjacent cells for communication.
The major function of plasmodesmata is intercellular communication.
it forms a passage that allows transportation and helps channel the nutrients between the cells.
Hence, the correct answer is option Plasmodesmata- Protection.
Question 8
1 / -0

A student coming out cell fractionation of a tissue and forgot to label his tubes. The contents of one tube when studied showed organelles bounded by the membrane with an activity of catalase enzyme. These organelles could be:-

A
SER

B
Chloroplast

C
Lysosome

D
Peroxisome
Solution
- Peroxisomes are membrane borne cell organelles, occurring in the cytoplasm of almost all eukaryotic cell.
- It contains the reducing enzyme catalase and usually some oxidases.
- Hence when a student coming out cell fractionation of tissue and forgot to label his tubes. The contents of one tube when studied showed organelles bounded by the membrane with an activity of catalase enzyme. These organelles could be Peroxisomes.
- So, the correct answer is 'Peroxisomes'.
Question 9
1 / -0

Choose the correct answer from the alternatives given :
Which of the following statements is correct regarding ribosomes?

A
Most of a cells DNA molecule are stored there.

B
Complete polypeptide is released from there.

C
mRNAs are produced there.

D
DNA replication takes place there.

Solution

Ribosomes are, called as protein factories. Each ribosome has two unequal parts, small and large. The larger subunit of the ribosome has a groove for pushing out the newly formed polypeptide and protecting the same from cellular enzymes. The smaller subunit fits over the larger one like a cap but leaves a tunnel for mRNA. The two subunits come together only at the time of protein formation.
So, the correct answer is 'Complete polypeptide is released from there.'
Question 10
1 / -0

Which of the following is absent in the prokaryotic cell?

A
Cell wall

B
Cell membrane

C
Nucleus

D
Ribosomes

Solution

A prokaryotic cell lacks a nucleus. However, they have a cell wall that gives them shape and protects them from the external environment, a porous semi-permeable cell membrane, and the ribosomes which synthesize proteins.
Thus, the correct answer is option C.

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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

Column I	Column II
(A) Dictyosomes	(i) Storage
(B) Mitochondria	(ii) Photosynthesis
(C) Vacuoles	(iii) Transport
(D) Grana	(iv) Secretion
	(v) Respiration

Column I	Column II
(A) Lysosomes	(i) Protein synthesis
(B) Ribosomes	(ii) Hydrolytic activity
(C) Smooth endoplasmic	(iii) Steroid synthesis
(D) Centriole	(iv) Formation of spindle

Cell The Unit of Life Test - 76

Result

Cell The Unit of Life Test - 76

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Rank

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Question 1

Made of two subunits

Form polysome

May attach to mRNA

Have on role in protein synthesis

Solution

Question 2

RNA only

Proteins only

RNA and proteins

RNA, proteins and DNA

Solution

Question 3

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 4

A- (iv); B- (v); C- (i); D- (ii)

A- (i); B- (ii); C- (iv); D- (iii)

A- (iv); B- (i); C- (ii); D- (iii)

A- (i); B- (ii); C- (iii); D- (iv)

Solution

Question 5

A- (ii); B- (i); C- (iii); D- (iv)

A- (i); B- (iii); C- (iv); D- (ii)

A- (i); B- (iv); C- (iii); D- (ii)

A- (iv); B- (iii); C- (i); D- (ii)

Solution

Question 6

Nucleolus

Cytoplasm

Mitochondria

Golgi complex

Solution

Question 7

Cell wall- structural support

Central vacuole- Storage

Amyloplast- Starch storage

Plasmodesmata- Protection

Solution

Question 8

SER

Chloroplast

Lysosome

Peroxisome

Solution

Question 9

Most of a cells DNA molecule are stored there.

Complete polypeptide is released from there.

mRNAs are produced there.

DNA replication takes place there.

Solution

Question 10

Cell wall

Cell membrane

Nucleus

Ribosomes

Solution

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