Cell The Unit of Life Test

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Cell The Unit of Life Test - 34

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Weekly Quiz Competition

Question 1
1 / -0

The dimerisation of two ribosome sub units depends on which of the following?

A
Mg$$^+$$$$^+$$

B
Ca$$^+$$$$^+$$

C
Fe$$^+$$$$^+$$

D
None of the above

Solution

The two subunits of ribosome unit come together for protein synthesis. The two ribosomal units combines together to form a dimer which requires an optimum concentration of Mg++ ions for association during the process of protein synthesis. A decreased concentration of Mg++ ions may lead to dissociation. In, bacterial cell the ribosomes remains dispersed in the cytoplasm, it comes together only during the process of protein synthesis,
Question 2
1 / -0

Lysosome is filled with which of the following enzymes?

A
Hydrolytic enzymes

B
Basic nucleases

C
Transferases

D
Synthetases

Solution

Lysosomes are small single membrane-bound vesicles containing hydrolytic enzymes. They are formed by Golgi apparatus and contain some 60 different types of acid hydrolase for digestion of various materials, e.g., nucleases, proteases, lipases, phosphatases, etc.
Question 3
1 / -0

Function of ER is/are

A
Attachment site of ribosomes

B
Storage of genetic material

C
Removal of newly synthesized on RNA

D
None of the above

Solution

Membranes of the endoplasmic reticulum (ER) may bear ribosomes when the ER is called Granular or Rough Endoplasmic Reticulum. It is abundant in cells engaged in active secretion. The attachment between ribosomes and endoplasmic reticulum is through signal recognition particle or SRP linked to 60S subunit of ribosome and ribophorin present over the ER. Thus, the correct answer is option A.
Question 4
1 / -0

Mitochondria are also called as

A
Lipochondria

B
Sarcoplasm

C
Chondriosomes

D
Microbodies

Solution

Mitochondria carry out aerobic respiration in the eukaryotic cell. Mitochondria were discovered by Kolliker in striated muscles of insects and given the present name by Benda. Mitochondria were called sarcosomes by Kolliker and bioblasts by Altman. Other names proposed were chondrisomes, chondriomites and plastochondria. Term Chondriome includes all mitochondria of a cell.
Question 5
1 / -0

Ribosomes are the centre for which of the following?

A
Respiration

B
Protein synthesis

C
Photosynthesis

D
Oxidation

Solution

The ribosome is a large and complex molecular machine found within all living cells, that serves as the primary site of biological protein synthesis (translation). Ribosomes link amino acids together in the order specified by messenger RNA (mRNA) molecules. Ribosomes are also known as 'protein factories of the cell'. They are present in both prokaryotes (70s) and eukaryotes (80s). Mitochondria is responsible for respiration. Chloroplast helps in photosynthesis. Smooth endoplasmic reticulum helps in fat synthesis.
Question 6
1 / -0

Lysosomes are called as suicidal bags because

A
They possess enzymes, which can digest cell debris

B
They suicide

C
They do nothing in a plant cell

D
None of these
Solution
Correct option: A
Explanation:
Lysosomes are the membrane-bound organelles in eukaryotic cells.
They have an acidic pH and have hydrolytic enzymes.
Whenever cell debris accumulates, the lysosome releases the enzyme and digest the whole cell.
Hence, lysosomes are called as suicidal bags because "they possess enzymes, which can digest cell debris"
Question 7
1 / -0

Which of the following is not found in intact cells?

A
Microsomes

B
Ribosomes

C
Lomasomes

D
Dictyosomes

Solution

The broken pieces of the endoplasmic reticulum during centrifugation appear as microsomes a fragmented piece (Claude, 1941) which are attached with the ribosomes.
Question 8
1 / -0

Identify the correct statement from the following.
(A) The endomembrane system includes plasma membrane, ER, Golgi complex, lysosomes, ribosome and vacuoles
(B) ER helps in the transport of substances, synthesis of proteins, lipoproteins and glycogen
(C) Ribosomes are involved in protein synthesis
(D) Mitochondria help in oxidative phosphorylation and generation of ATP

A
(B), (C) and (D)

B
(A)

C
(B)

D
(C)

E
(D)

Solution

The endomembrane system of the eukaryotic cell is a group of structure which transports the cellular material from one compartment to another. This system includes endoplasmic reticulum (ER), Golgi apparatus, lysosome, and plasma membrane. The ER membranes are involved in the biosynthesis of proteins, glycogen and conjugate proteins like lipoprotein. Ribosomes carry out the process of protein synthesis and mitochondria carry out the process of ATP synthesis by oxidative phosphorylation.
Question 9
1 / -0

The diagram of the ultrastructure of a plant cell is given below. Identify the function of the organelles labeled A, B, C, D, E in the diagram.

A
A = Site of photophosphorylation, B = Storage of cell sap, C = Intracellular transport, D = Site of oxidative phosphorylation, E = Principal director of macromolecular traffic.

B
A = Storage of cell sap, B = Site of oxidation phosphorylation, C = Principal director of macromolecular traffic, D = Site of photophosphorylation, E = Intracellular transport.

C
A = Intracellular transport, B = Site of oxidation phosphorylation, C = Principal director of macromolecular traffic, D = Storage of cell sap.

D
A = Principal director of macromolecular traffic, B = Site of oxidative phosphorylation, C = Intracellular transport, D = Site of photophosphorylation, E = Storage of cell sap

Solution

A functions as the Principal director of macromolecular traffic. Its Golgi apparatus. Golgi apparatus is called so because it acts as an area for the storage processing and packaging of all the cell secretions. All macromolecules which are to be sent outside the cell, move through the golgi body. So golgi body is termed as "Director of macromolecular traffic in cell'' or 'middle men of the cell'. It takes part in synthesis of cell wall material.
B functions as the site of oxidative phosphorylation. It is mitochondria. Oxidative phosphorylation is the process in which ATP is formed as a result of the transfer of electrons from NADH or FADH2 to O2 by a series of electron carriers. This process, which takes place in mitochondria,is the major source of ATP synthesis.
C functions as the Intracellular transport, via membrane bound carriers,is essential for proper functioning of a cell.It, for instance, deliver newly synthesized proteins via Endoplasmic Reticulum (ER) and Golgi complex to the location where they can perform their function.
D is the photophosphorylation site which occurs in the chloroplast of a plant cell.
E is the site for the storage of cell sap. It is the vacuole.
So, the correct option is (D).
Question 10
1 / -0

Which of the following is a cell organelle pertaining to energy release process?

A
Lysosome

B
Chloroplast

C
Mitochondria

D
Endoplasmic reticulum

Solution

Mitochondria are often referred to as the powerhouses of the cells. They generate the energy that our cells need to do their jobs. Mitochondria generate chemical energy called as ATP. ATP is an energy currency that every cell in our body can use and it keeps us alive. The machinery that the mitochondria use to make ATP is called as the electron transport chain.

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Cell The Unit of Life Test - 34

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Cell The Unit of Life Test - 34

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Question 1

Mg$$^+$$$$^+$$

Ca$$^+$$$$^+$$

Fe$$^+$$$$^+$$

None of the above

Solution

Question 2

Hydrolytic enzymes

Basic nucleases

Transferases

Synthetases

Solution

Question 3

Attachment site of ribosomes

Storage of genetic material

Removal of newly synthesized on RNA

None of the above

Solution

Question 4

Lipochondria

Sarcoplasm

Chondriosomes

Microbodies

Solution

Question 5

Respiration

Protein synthesis

Photosynthesis

Oxidation

Solution

Question 6

They possess enzymes, which can digest cell debris

They suicide

They do nothing in a plant cell

None of these

Solution

Question 7

Microsomes

Ribosomes

Lomasomes

Dictyosomes

Solution

Question 8

(B), (C) and (D)

(A)

(B)

(C)

(D)

Solution

Question 9

A = Site of photophosphorylation, B = Storage of cell sap, C = Intracellular transport, D = Site of oxidative phosphorylation, E = Principal director of macromolecular traffic.

A = Storage of cell sap, B = Site of oxidation phosphorylation, C = Principal director of macromolecular traffic, D = Site of photophosphorylation, E = Intracellular transport.

A = Intracellular transport, B = Site of oxidation phosphorylation, C = Principal director of macromolecular traffic, D = Storage of cell sap.

A = Principal director of macromolecular traffic, B = Site of oxidative phosphorylation, C = Intracellular transport, D = Site of photophosphorylation, E = Storage of cell sap

Solution

Question 10

Lysosome

Chloroplast

Mitochondria

Endoplasmic reticulum

Solution

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