Cell The Unit of Life Test

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Cell The Unit of Life Test - 84

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Question 1
1 / -0

Which of the following is not a function of ribosome?

A
It helps in the manufacture of protein molecules

B
It helps in manufacture of enzymes

C
It helps in manufacture of starch molecules

D
None of these
Solution
- Ribosomes are involved in protein synthesis. Enzymes are also proteins. Hence, ribosomes also make enzymes. But it is not involved in the manufacture of starch.
- Glucose which is produced during the dark reaction of the photosynthesis is stored in form of starch in the vacuoles in the mesophyll cells.
So, the correct answer is option C.
Question 2
1 / -0

The lysosomes are known as 'suicide-bags' of a cell because

A
When a cell gets damaged during the disturbance in cellular metabolism, lysosomes may burst and the digestive enzymes, thus, released digest their own cell.

B
When a cell gets formed, lysosomes may burst and the digestive enzymes, thus, released digest their own cell.

C
Lysosome helps in food digestion.

D
None of the above.

Solution

Lysosomes are membrane bound cellular organelles. They possess many hydrolytic enzymes for the digestion of cellular waste, debris, as engulfed, killed viruses or bacteria. When a cell is in a metabolic crisis then lysosomes digest its own cell or cellular components by releasing enzymes.
Question 3
1 / -0

Which type of plastids is commonly found in the roots of the plant?

A
Leucoplast

B
Chloroplast

C
Aleuroplast

D
Chromoplast

Solution

Leucoplasts are colourless plastids and mainly help in storage of food compounds like starch, proteins or fats. Such, colourless plastids are present in underground roots, stems.
Question 4
1 / -0

Barophilic prokaryotes

A
Grow slowly in highly alkaline frozen lakes at high altitudes

B
Occur in water containing high concentration of barium hydroxide

C
Grow and multiply in very deep marine sediments

D
Readily grow and divide in sea water enriched in any soluble salt of barium

Solution

Barophiles grow preferentially or exclusively at moderate or high hydrostatic pressures in deep marine sediments, such as those at the Challenger Deep in the Marianas Trench, which has a depth of 10,994 m. They are adapted to grow at a pressure greater than or near 40 Mpa.
So, the correct answer is option C.
Question 5
1 / -0

The cell membranes of adjacent cells are fused at which of the following cell junction?

A
Macula adherens

B
Zonula adherens

C
Zonula occludens

D
Nexus

Solution

Zonulae occludentes refers to tight junctions. Plasmalemma of two cells fuses to form impermeable or occluding junctions. For example, epithelial cells or capillaries and brain cells. Tight junctions are different in different tissues.
Macula adherens refers to desmosomes which are welded areas between adjacent cells having intercellular thickening materials, transmembrane linkers, disc-shaped intracellular thickening adjacent to each membrane with tonofibrils.
Zonula adherens refers to terminal bars, i.e., desmosomes which lack tonofibrils and where discoid thickenings are replaced by bands of microfilaments and intermediate filaments.
Nexus is involved in intracellular adhesion and transport.
So, the correct answer is option C.
Question 6
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 fraction is obtained by ultracentrifugation of cell contents. When post-mitochondrial supernatant is subjected to a centrifugal force of 50000 x g for two hours; Microsomal fraction settles down. The fraction includes microsomes, endoplasmic reticulum, Golgi bodies etc. Microsomes are broken pieces of ER often with attached ribosomes.
Question 7
1 / -0

Lysozyme that is present in perspiration, saliva and tears, destroys:

A
Most virus infected cells

B
Certain fungi

C
Certain types of bacteria

D
All viruses
Solution
Correct option : (C)
Explanation of the correct option :
- Lysozyme is an enzyme that is found mostly in tears & saliva.
- They have antimicrobial nature by cleaving the peptidoglycan component of bacterial cell walls and causes the death of the bacteria.
- The fungal cell wall is made of chitin and not affected by lysozyme.
- Viruses do not show the presence of cell walls.
Question 8
1 / -0

Lipid molecules in the cells are synthesized by

A
Smooth endoplasmic reticulum

B
Rough endoplasmic reticulum

C
Golgi apparatus

D
Plastids

Solution

The smooth endoplasmic reticulum (abbreviated SER) has functions in several metabolic processes. It synthesizes lipids, phospholipids and steroids. Cells which secrete these products, such as those in the testes, ovaries and sebaceous glands have an abundance of smooth endoplasmic reticulum.
Question 9
1 / -0

Which of the following characters distinguishes plant cells from animal cells?

A
Cell wall

B
Vacuole

C
Plastids

D
All of the above

Solution

Plastids are present in plant cells, whereas, in animal cell these are usually absent. It helps to trap sunlight for photosynthesis.
Vacuoles in plants are much larger than those found in animals.
The cell wall is present in plant cell and absent in an animal cell. It gives rigidity to a plant cell.
So, the correct answer is option D.
Question 10
1 / -0

What is the total amount of DNA present in mitochondria of Neurospora?

A
10%

B
40%

C
1%

D
Nil

Solution

The mitochondria possess self-replicated DNA and ribosomes and thus called as a semiautonomous organelle. The amount of DNA associated with mitochondria varies from 0.2% of the total cellular DNA in mouse liver cells to 20% in haploid yeast and to more than 99% in amphibian oocytes. Neurospora is the genus of Ascomycetes fungi which possess 1% of total cellular DNA in mitochondria.

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Cell The Unit of Life Test - 84

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Cell The Unit of Life Test - 84

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SHARING IS CARING

Question 1

It helps in the manufacture of protein molecules

It helps in manufacture of enzymes

It helps in manufacture of starch molecules

None of these

Solution

Question 2

When a cell gets damaged during the disturbance in cellular metabolism, lysosomes may burst and the digestive enzymes, thus, released digest their own cell.

When a cell gets formed, lysosomes may burst and the digestive enzymes, thus, released digest their own cell.

Lysosome helps in food digestion.

None of the above.

Solution

Question 3

Leucoplast

Chloroplast

Aleuroplast

Chromoplast

Solution

Question 4

Grow slowly in highly alkaline frozen lakes at high altitudes

Occur in water containing high concentration of barium hydroxide

Grow and multiply in very deep marine sediments

Readily grow and divide in sea water enriched in any soluble salt of barium

Solution

Question 5

Macula adherens

Zonula adherens

Zonula occludens

Nexus

Solution

Question 6

Microsome

Polysome

Quantosome

Episome

Solution

Question 7

Most virus infected cells

Certain fungi

Certain types of bacteria

All viruses

Solution

Question 8

Smooth endoplasmic reticulum

Rough endoplasmic reticulum

Golgi apparatus

Plastids

Solution

Question 9

Cell wall

Vacuole

Plastids

All of the above

Solution

Question 10

10%

40%

1%

Nil

Solution

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