Cell The Unit of Life Test

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Cell The Unit of Life Test - 23

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Question 1
1 / -0

The structural component of ribosome is

A
t-RNA

B
m-RNA

C
r-RNA

D
DNA

Solution

The structural component of ribosome is $$r-RNA$$.
Ribosomes are the cellular component that make proteins from all amino acids. Ribosomes are made from complexes of $$RNAs$$ and proteins. The number of ribosomes in a cell depends on the activity of the cell. Ribosomes are freely suspended in the cytoplasm or attached to the endoplasmic reticulum forming the rough endoplasmic reticulum. On an average in a mammalian cell there can be about 10 million ribosomes.
Question 2
1 / -0

F$$_{1}$$ particles or oxysome are present in

A
Endoplasmic reticulum

B
Chloroplast

C
Mitochondria

D
Golgi complex

Solution

F$$_1$$ particles are also called as oxysomes or elementary particles. They are embedded in the inner mitochondrial membrane. They participate in oxidative phosphorylation and produce ATP. Thus, the correct answer is option C.
Question 3
1 / -0

Thickness of plasma membrane is

A
10$$\dot{A}$$ to 30$$\dot{A}$$

B
30$$\dot{A}$$ to 50$$\dot{A}$$

C
50$$\dot{A}$$ to 70$$\dot{A}$$

D
70$$\dot{A}$$ to 100$$\dot{A}$$

Solution

Plasma membrane or cell membrane is the outer covering of all the cells and made up of phospholipid bilayer structure with embedded proteins. The thickness of the plasma membrane ranges from 7.0nm to 10nm or 70$$A^{o}$$ to 100$$A^o$$.
Question 4
1 / -0

Prokaryotic origin of mitochondria was proposed by

A
Rabinowitch

B
Altmann and Schimper

C
Salton

D
Morrison

Solution

The hypothesis of the symbiont, by Altmann and Schimper, 1890, stated that mitochondria and chloroplasts may be considered as intracellular parasites which have entered in the cytoplasm of eukaryotic cells in the early evolutionary period and remains in the symbiotic relationship with eukaryotic cells. Mitochondria are supposed to be derived from bacterial cells while chloroplasts have been derived from blue green algae.
Question 5
1 / -0

In trees, death of protoplasts is essential for vital function such as

A
Stomatal movements

B
Food transport

C
Water transport

D
Both water and food transport

Solution

Water transport is a physical process and not a physiological process. It does not require living cells and protoplasm. The driving force is the transpiration pull generated by loss of water through leaves. This is the reason why xylem tracheids and vessels are dead on maturity. Food transport is a physiological process and requires living cells similarly stomatal movement also is a physiological process and requires living cells.
So, the correct answer is 'Water transport'
Question 6
1 / -0

Mitochondria are related to

A
Prokaryotes

B
Plasmids

C
Plastids

D
Viruses

Solution

Mitochondria are the cell organelles present in the eukaryotic cells (plant and animal cells). These are oval or oblong in shape and are surrounded by double layered membrane.
The inner membrane of mitochondria folds inside and forms the structures called cristae. This leads to the increase of the internal surface area in mitochondria.
The mitochondria structurally resembles like plastids, which are present in some eukaryotic cells such as plant cells but not in animal cells. Unlike Mitochondria, plastids helps in the photosynthesis and contains pigments. While, mitochondria helps in the formation of ATP and helps in other cellular processes.
Question 7
1 / -0

Which of the following is correct pair?

A
DNA synthesis - Ribosomes

B
Protein synthesis - Smooth E.R.

C
Aerobic respiration - Cristae

D
Suicidal sacs - Dictyosomes

Solution

Mitochondria are the organelles which carry out oxidative catabolism, i.e., aerobic oxidation of food and synthesize ATP in the process. This process which occurs on infoldings of the inner mitochondrial membrane (cristae) is called as oxidative phosphorylation. This fold increases the surface area for absorption.
Question 8
1 / -0

Which type of membrane is most abundant within a cell?

A
ER membrane

B
Nuclear membrane

C
Golgi membrane

D
Plasma membrane

Solution

The endoplasmic reticulum is a system of membrane-lined channels found in all eukaryotic cells. It constitutes around 30 to 60 percent of total cell membranes. Thus, the correct answer is option A.
Question 9
1 / -0

Highest number of enzyme is found in

A
Lysosome

B
Chloroplast

C
Mitochondria

D
Peroxisome
Solution
- The lysosomes have acid hydrolases or hydrolytic digestive enzymes.
- The chloroplasts have photosynthetic enzymes for carrying out the synthesis of sugars.
- Peroxisomes have enzymes like catalase and peroxidase concerned with peroxide metabolism.
- The mitochondria contain the highest number of enzymes. Mitochondria contain respiratory enzymes concerned with ATP synthesis in eukaryotic cells. The entire inner mitochondrial membrane is studded with enzymes of respiratory electron transport. The mitochondrial matrix contains enzymes for Kreb's cycle.
- Thus, the correct answer is option C.
Question 10
1 / -0

Extension of plasma membrane in prokaryotes is a/an

A
ER

B
Mesosome

C
Ribosome

D
Mitochondria
Solution
- Prokaryotic cells are devoid of membrane-bound organelles like the nucleus, mitochondria, ER, etc.
- Mesosomes or chondroid are formed due to invaginations of the plasma membrane of bacteria and serve as the respiratory center.
- These are of two types - septal mesosomes and lateral mesosomes.
- Mesosomes are more prevalent in Gram +ve bacteria and they are rich in respiratory enzymes.
- The ribosome is the nonmembrane-bound organelle hence is present in a prokaryotic cell but it is not formed due to the extension of the plasma membrane.
Hence the correct option is B.

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Cell The Unit of Life Test - 23

Result

Cell The Unit of Life Test - 23

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SHARING IS CARING

Question 1

t-RNA

m-RNA

r-RNA

DNA

Solution

Question 2

Endoplasmic reticulum

Chloroplast

Mitochondria

Golgi complex

Solution

Question 3

10$$\dot{A}$$ to 30$$\dot{A}$$

30$$\dot{A}$$ to 50$$\dot{A}$$

50$$\dot{A}$$ to 70$$\dot{A}$$

70$$\dot{A}$$ to 100$$\dot{A}$$

Solution

Question 4

Rabinowitch

Altmann and Schimper

Salton

Morrison

Solution

Question 5

Stomatal movements

Food transport

Water transport

Both water and food transport

Solution

Question 6

Prokaryotes

Plasmids

Plastids

Viruses

Solution

Question 7

DNA synthesis - Ribosomes

Protein synthesis - Smooth E.R.

Aerobic respiration - Cristae

Suicidal sacs - Dictyosomes

Solution

Question 8

ER membrane

Nuclear membrane

Golgi membrane

Plasma membrane

Solution

Question 9

Lysosome

Chloroplast

Mitochondria

Peroxisome

Solution

Question 10

ER

Mesosome

Ribosome

Mitochondria

Solution

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