Cell The Unit of Life Test

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Cell The Unit of Life Test - 45

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Question 1
1 / -0

Lysosomes are also known as 'suicide bags' because of

A
Catalytic activity

B
Hydrolytic activity

C
Parasitic activity

D
Saprophytic activity

Solution

Lysosomes are the single membrane-bounded organelle found in eukaryotic cells. It contains hydrolytic enzymes for the digestion of the cell debris, wastes, foreign particles, dead or nonfunctional organelles. Lysosomes are called as suicide bags because of its hydrolytic activities. It digests their own cell when the plasma membrane gets rupture and the pH of the cell get change.
Question 2
1 / -0

In mitochondria, cristae acts as sites for

A
Protein synthesis

B
Breakdown of macromolecules

C
Flavoprotein phosphorylation

D
Oxidation-reduction reactions

Solution

Protein synthesis is carried out by ribosomes.
Breakdown of macromolecules is carried out by various enzymes in the digestive system.
Flavoprotein is one of the components of electron transport chain present in cristae of mitochondria.
Mitochondria are bounded by a double membranous layer. Its inner membrane shows the presence of finger-like projections called as cristae. This folded structure increases the surface area for chemical reactions.
Electron transport system is present in the cristae (inner membrane infoldings of mitochondria). It is made up of cytochromes and co-enzymes which act as carrier molecules and transfer molecules. These molecules accept high energy electrons and pass them to next molecule in the system. At proton-pumping sites, the energy of electrons is used to pump protons into outer compartment of mitochondria. These protons are used by ATP synthase to make energy molecules, i.e., ATPs. This whole reaction is termed as 'oxidation-reduction' reaction.
So, the correct answer is option D.
Question 3
1 / -0

Biological oxidation by enzymes occur in

A
Golgi complex

B
Ribosomes

C
Mitochondria

D
None of the above

Solution

Biological oxidation is energy producing reactions in living cells involving the transfer of hydrogen atoms or electrons from one molecule to another by enzymes like NADH dehydrogenase, is carried out in mitochondria. During this process energy is produced in the form of ATP.
Question 4
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All bacteria have

A
Mesosomes

B
Mitochondria

C
Chloroplast

D
Golgi complex

Solution

A.Correct option -A

B.Explanation for correct option -A
●Mesosomes are unique membranous structures in bacteria.
●It is recognized that the mesosome should be involved in several fundamental processes.
●Hydrogen peroxide is involved in mesosomes formation during cell injury and cell division processes of cells.
Question 5
1 / -0

Mitochondria were first observed by

A
Brown

B
Altmann

C
Hooker

D
Svedberg
Solution
Correct Answer: B
Explanation:
Mitochondria, often called as powerhouse of the cell was discovered by Albert von Kolliker in 1857 as "granules" (sarcosomes) in muscle cells.
Later, it was coined as "Bioblast"(life germs) and its first structure is published by Richard Altmann in 1886.
The term "Mitochondria" was coined by Carl Benda 12 years later, in 1898.
Hence, the correct answer is Altmann.
Question 6
1 / -0

Which of the following organelles work as cellular garbage disposal systems?

A
Endoplasmic reticulum

B
Golgi complex

C
Lysosomes

D
Mitochondria

Solution

Lysosomes are the single membrane-bounded organelle found in eukaryotic cells. It contains hydrolytic enzymes for the digestion of the cell debris, wastes, foreign particles, dead or nonfunctional organelles. IT is called as cellular garbage disposal system because it removes the wastes and dead cellular part by their digestion with the enzyme and excreted out of the cell with help of plasma membrane.
Question 7
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Which of the following is an incorrect pair?

A
Storage sac of the cell- Lysosome

B
Transporting channel of the cell- Endoplasmic reticulum

C
Packaging and exporting unit of the cell- Golgi complex

D
Brain of the cell- Nuclues
Solution
Answer: (A) Storage sac of the cell- Lysosome.
Explanation:
In a cell, different organelle performs different functions to make the cell functioning properly thus maintaining the division of labor.
The endoplasmic reticulum acts as the transporting channel for secretory proteins.
Golgi complex helps in packaging, processing, and exporting the proteins received from the endoplasmic reticulum.
The nucleus is called the brain of the cell as all the metabolism that is regulated in a cell is controlled by the nucleus.
Vacuoles are the storage sac of the cells.
Lysosome degrades or recycles the cellular waste of the cell.
Hence, the incorrect pair is option (A).
Question 8
1 / -0

Which one of the following is credited for discovering lysosomes?

A
M. Calvin

B
A. Claude

C
Christian de Duve

D
Linus Pauling

Solution

Explorer of the cell who discovered new organelles by using a centrifuge. Christian de Duve, whose laboratory in Louvain discovered lysosomes in 1955 and defined peroxisomes in 1965.
So, option C is correct.
Question 9
1 / -0

Lysosomes are surrounded by

A
One membrane

B
Two membranes

C
Three membranes

D
None of the above

Solution

Lysosomes are the single membrane-bounded organelle found in eukaryotic cells. It contains hydrolytic enzymes for the digestion of the cell debris, wastes, foreign particles, dead or nonfunctional organelles
So, the correct answer is 'One membrane'
Question 10
1 / -0

If a toxin, such as a bacterial toxin, destroys ribosomes, what cellular activity will be affected first ?

A
Protein synthesis

B
DNA synthesis

C
Movement

D
Energy storage

Solution

The ribosomes are the cellular organelles which are involved in the translation of the mRNA to form protein. The ribosomes are in free state or attached to the surface of endoplasmic reticulum and involved in the production of proteins, enzymes and hormones. The bacterial toxins which destroy the ribosome will affect the protein synthesis.
Thus, the correct answer is option A.

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Cell The Unit of Life Test - 45

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Cell The Unit of Life Test - 45

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Question 1

Catalytic activity

Hydrolytic activity

Parasitic activity

Saprophytic activity

Solution

Question 2

Protein synthesis

Breakdown of macromolecules

Flavoprotein phosphorylation

Oxidation-reduction reactions

Solution

Question 3

Golgi complex

Ribosomes

Mitochondria

None of the above

Solution

Question 4

Mesosomes

Mitochondria

Chloroplast

Golgi complex

Solution

Question 5

Brown

Altmann

Hooker

Svedberg

Solution

Question 6

Endoplasmic reticulum

Golgi complex

Lysosomes

Mitochondria

Solution

Question 7

Storage sac of the cell- Lysosome

Transporting channel of the cell- Endoplasmic reticulum

Packaging and exporting unit of the cell- Golgi complex

Brain of the cell- Nuclues

Solution

Question 8

M. Calvin

A. Claude

Christian de Duve

Linus Pauling

Solution

Question 9

One membrane

Two membranes

Three membranes

None of the above

Solution

Question 10

Protein synthesis

DNA synthesis

Movement

Energy storage

Solution

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