Cell The Unit of Life Test

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Cell The Unit of Life Test - 86

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Weekly Quiz Competition

Question 1
1 / -0

ER shows characteristic arrangement of vesicles in different body cells. Identify the incorrect statement from the following statements.

A
Parallel rows in liver cells

B
Reticular in mammalian RBC

C
Haphazard in pancreatic cells

D
Network in striated muscle cells

Solution

The endoplasmic reticulum is a system of membrane-lined channels found in all eukaryotic cells except mature erythrocytes. It constitutes more than 30 to 60 percent of the total cell membrane. The membrane system of the endoplasmic reticulum is double-membraned and is often connected with the outer membrane of the nuclear envelope.
Question 2
1 / -0

The maximum number of enzymes are found in

A
Lysosomes

B
Endoplasmic reticulum

C
Nucleus

D
Mitochondria

Solution

Mitochondria is the site for aerobic respiration in cell and produces energy in the form of ATP. For the formation of energy different pathways like electron transport chain, kreb's cycle are involved and operated by the different enzymes. Thus, the maximum number of enzymes are found in mitochondria.
Question 3
1 / -0

Which of the following is the function of lysosome?

A
Autolysis

B
Aid in fertilization

C
Initiation of mitosis

D
All of the above

Solution

Lysosomes are minute single membrane bound organelle-rich in hydrolytic enzymes which aid in lysis of materials. They aid in fertilization. During fertilization, the sperm releases hydrolytic enzymes from the acrosome vesicles and digest the membrane of the ovum. This degradation triggers the entry of the male nucleus into the ovum and fertilization takes place. Lysosome is also called as autophagy as worn out or defective organelles are digested in the autophagic vesicles or lysosome and they secrete depressors to initiate cell division. Thus, the correct answer is option D.
Question 4
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The main organelle involved in modification and rooting of newly synthesized proteins to their destinations is

A
Mitochondria

B
Endoplasmic reticulum

C
Lysosome

D
Chloroplast

Solution

The synthesis of almost all the proteins begins on ribosomes in the cytoplasm but the final destination of these proteins are different. Proteins destined for secretions, integration in the plasma membrane or inclusion in the lysosomes share the transport pathway that begins in the endoplasmic reticulum. Proteins destined for mitochondria, chloroplasts or the nucleus each use separate mechanisms and proteins destined for the cytosol remain where they are synthesized. The pathways by which proteins are sorted and transported to their proper cellular location are often referred to as protein targeting pathways which id done by the endoplasmic reticulum. Thus, the correct answer is option B.
Question 5
1 / -0

Which of the following subunit of ribosomes is composed of 23S rRNA and a 5S rRNA + 32 different proteins?

A
50S

B
70S

C
30S

D
60S

E
23S

Solution

The ribosomal subunit that contains 23S rRNA and a 5S rRNA + 32 different proteins is a 50S ribosomal subunit of the 70S ribosome that is present in prokaryotes and in Mitochondria and Chloroplast of the Eukaryotic cell
So, the correct answer is '50S'
Question 6
1 / -0

Lysosomes are known as 'suicidal bags' of the cell. Which of the following statements justify the given fact?

A
Lysosomes contain hydrolytic enzymes

B
Lysosomes contain hormones

C
Hydrolytic enzymes digest all cell debris

D
Both A and C

Solution

Lysosomes are membrane bound cellular organelles. They possess many hydrolytic, proteolytic enzymes for the digestion of cellular waste, debris as engulfed, killed viruses or bacteria. The lysosomes are called as suicide bags of the cell because they digest its own cellular content when the pH of the cell alters.
Question 7
1 / -0

Which of the following are functions of ribosome?
(i) It helps in manufacture of protein molecules.
(ii) It helps in manufacture of enzymes.
(iii) It helps in manufacture of hormones.
(iv) It helps in manufacture of starch molecules.

A
(i) and (ii)

B
(ii) and (iii)

C
(iii) and (iv)

D
(i) and (iv)

Solution

Ribosomes are involved in protein synthesis. Almost all enzymes are proteins. Hence, ribosomes make enzymes too. Chemical structure of hormones is diverse including steroid, eicosanoids, amino acids derivatives, proteins and peptides. Hence, except proteinous hormones, all other types of hormones cannot be synthesized by ribosomes.Ribosomes are not involved in starch manufacture.
So, the correct answer is option A.
Question 8
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Is there any difference between animal and plant vacuoles?

A
In animal cell, small vacuoles are present, but in mature plant cell, a large central vacuole occupies the centre of the cell.

B
In animal cell vacuoles are small, but in plant cell vacuoles are large.

C
Both A and B.

D
None of the above.

Solution

Vacuoles are storage bubbles which are present in both, animal and plant cells. These are used for storage of food or water. Plant cell vacuoles are bigger than animal cells. It occupies most of the part of the plant cell and generally present in the center.
Hence the correct option is C.
Question 9
1 / -0

The rough ER is so named because it has an abundance of

A
Mitochondria

B
Lysosomes

C
Golgi bodies

D
Ribosomes

Solution

Rough endoplasmic reticulum is a part of endoplasmic reticulum which possesses ribosomes on its surface and makes it irregular. These are mainly involved in the protein synthesis.
Question 10
1 / -0

Find out the false statement.

A
Nucleus, plastids and mitochondria contain DNA and hence, are able to make their own structural proteins.

B
Mitochondria are said to be the 'power house' of the cell.

C
Lysosomes are chlorophyll containing bags surrounded by a single unit membrane.

D
Ribosomes are also called as Palade particles and are the 'protein factories' of the cell.

Solution

Nucleus, plastids and mitochondria contain DNA. Transcription of DNA present in all these organelles can be carried out to form mRNA and such mRNA is translated to form required protein. Hence, they are able to make their own structural proteins. Mitochondria is called as powerhouse of cell as it produces and stores energy in the form of ATP. Ribosomes are also called as Palade particles as they are first discovered and described by George Palade. Ribosomes are involved in the process of protein synthesis.
Lysosomes are membrane bound cellular organelles. They possess many hydrolytic enzymes for the digestion of cellular waste, debris as engulfed, killed viruses or bacteria. Lysosomes are surrounded by a single membrane. Lysosomal membrane allows the digestive enzymes to work at lower pH. It also protects the cytosol from digestive enzymes. Chlorophyll pigment is produced and stored in chloroplast.
So, option C is the correct answer.

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Cell The Unit of Life Test - 86

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Cell The Unit of Life Test - 86

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SHARING IS CARING

Question 1

Parallel rows in liver cells

Reticular in mammalian RBC

Haphazard in pancreatic cells

Network in striated muscle cells

Solution

Question 2

Lysosomes

Endoplasmic reticulum

Nucleus

Mitochondria

Solution

Question 3

Autolysis

Aid in fertilization

Initiation of mitosis

All of the above

Solution

Question 4

Mitochondria

Endoplasmic reticulum

Lysosome

Chloroplast

Solution

Question 5

50S

70S

30S

60S

23S

Solution

Question 6

Lysosomes contain hydrolytic enzymes

Lysosomes contain hormones

Hydrolytic enzymes digest all cell debris

Both A and C

Solution

Question 7

(i) and (ii)

(ii) and (iii)

(iii) and (iv)

(i) and (iv)

Solution

Question 8

In animal cell, small vacuoles are present, but in mature plant cell, a large central vacuole occupies the centre of the cell.

In animal cell vacuoles are small, but in plant cell vacuoles are large.

Both A and B.

None of the above.

Solution

Question 9

Mitochondria

Lysosomes

Golgi bodies

Ribosomes

Solution

Question 10

Nucleus, plastids and mitochondria contain DNA and hence, are able to make their own structural proteins.

Mitochondria are said to be the 'power house' of the cell.

Lysosomes are chlorophyll containing bags surrounded by a single unit membrane.

Ribosomes are also called as Palade particles and are the 'protein factories' of the cell.

Solution

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