Cell The Unit of Life Test

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Cell The Unit of Life Test - 68

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Question 1
1 / -0

ATP is required for

A
Active process

B
Passive process

C
All types of processes

D
None of the above.
Question 2
1 / -0

rRNA occurs in

A
Lysosomes

B
Cytosol

C
Ribosomes

D
Golgi apparatus.

Solution

rRNAs are found in the ribosomes and account for 80% of the total RNA present in the cell. Ribosomes are composed of a large subunit called the 50S and a small subunit called the 30S, each of which is made up of its own specific rRNA molecules.
So, the correct option is 'C'.
Question 3
1 / -0

The eukaryotic genome differs from the prokaryotic genome because

A
The DNA is complexed with histone in prokaryotes

B
The DNA is circular and single stranded in prokaryotes

C
Repetitive sequences are present in eukaryotes

D
Genes in the former case are organised into operons

Solution

Genome refers to the total sets of chromosomes carried by each cell of the organism. In prokaryotes, the genetic material is circular and single stranded DNA. It has no association of histones. It remains in direct contact with the cytoplasm. The eukaryotic genetic material is linear and double stranded DNA. It is associated with histone proteins to form nucleosome unit. It is separated by a nuclear membrane.
So, the correct answer is option B.
Question 4
1 / -0

Which one is an organelle within an organelle ?

A
ER

B
Mesosome

C
Peroxisome

D
Ribosome

Solution

Mesosomes are basically folds of the plasma membrane, found lining the cell wall. They take part in cell respiration and thus need more surface area. These folds can become distinct vesicles, tubules, and lamellas. They are called organelles within organelles as they orginate as a part of other organelle called cell membrane.
Endoplasmic reticulum (ER) is attached to the nuclear envelope for protein and lipid synthesis. ER., Ribosomes, and peroxisomes are distinct cell organelles.
Option B is correct.
Question 5
1 / -0

Endoskeleton of cell is :

A
Cell wall

B
Mitochondria

C
Endoplasmic reticulum

D
Cytoplasm

Solution

The endoskeleton is the organelle of the cell which gives structural support to the cell. The endoskeleton of the cell is endoplasmic reticulum. As the name suggests, it is made up of membranous sheets and tubules that begin near the nucleus and extend across the cell.
Cell wall forms the boundary of the cell.
Mitochondria produce energy from food.
Cytoplasm is the fluid in the cell in which all organelles float.
Option A is correct.
Question 6
1 / -0

Which of the following statement is not true with reference to mitochondria?

A
They divide in synchrony with cell cycle

B
They contain DNA

C
They contain cristae

D
They store and release chemical energy

Solution

Mitochondria are cell organelles of aerobic eukaryotes which take part in oxidative phosphorylation and Krebs' cycle of aerobic respiration. They are double membrane structure where the inner membrane is thrown in various types of fold called cristae. The cristae increase the surface area for absorption and also increases the efficiency of the mitochondria. They contain their own DNA hence called semi-autonomous. Mitochondria do not divide in synchrony with the cell cycle.
So, the correct answer is option A.
Question 7
1 / -0

Lysosomes take part in :

A
Intracellular digestion

B
Extracellular digestion

C
Fat breakdown

D
Both (A) and (B)

Solution

Lysosomes are small vesicles which are bounded by a single membrane and contains hydrolytic enzymes in the form of minute crystalline or semicrystalline granules of 5-8 nm. Lysosomes are the cell organelles which are called suicide bags because of the presence of a large number of digestive enzymes or acid hydrolases in them. Only a thin membrane separates the destructive enzymes from the rest of the cell. If the membrane happens to get broken, the various cellular constituents would undergo lysis. Lysosomes take part in intracellular digestion and extracellular digestion. Individual cells may obtain food through phagocytosis. The same is digested with the help of lysosomes. In this way lysosomes take part in intracellular digestion. For extracellular digestion, lysosomes release enzymes in the external environment through exocytosis.
Question 8
1 / -0

Signalling theory with respect to cell is related to

A
Nervous system

B
Emergency

C
Formation of special membrane Iipids

D
Synthesis of secretory proteins

Solution

D. Synthesis of secretory proteins
EXPLANATION: Cell signalling is an important fact of biological life. It allows cells to perceive and respond to the extracellular environment allowing development, growth, immunity, etc. Cell signalling theory is related to the synthesis of secretory proteins.
Question 9
1 / -0

Which of the following cell organelles stores hydrolytic enzymes?

A
Centriole

B
Lysosome

C
Chromoplast

D
Chloroplast

Solution

Lysosomes are formed by Golgi bodies. These are membrane-bounded vesicles which contain digestive and hydrolytic enzymes glycosidases, proteases and sulfatases. The enzymes are synthesized in the mRNA transcripts exit the nucleus into the cytosol, where they are translated by rough endoplasmic reticulum. The enzymes leave the Golgi apparatus as a vesicle known as lysosomes
So, the correct answer is 'Lysosome'
Question 10
1 / -0

Which one of the following biomolecules is synthesized in smooth endoplasmic reticulum?

A
Proteins

B
Lipids

C
Carbohydrates

D
Nucleotides

Solution

Endoplasmic reticulum is an organelle found in eukaryotic cells. There are two types of endoplasmic reticulum, rough endoplasmic reticulum and smooth endoplasmic reticulum. Rough ER has ribosomes on its surface. Smooth ER lacks ribosomes on its surface. Smooth ER performs various functions in the cell. It synthesizes lipids. It metabolizes carbohydrates. It synthesizes steroids like hormones and vitamins. It performs the function of detoxification. It breakdowns harmful substances into simpler and safe substances.
Thus, the correct answer is option B.

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Cell The Unit of Life Test - 68

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Cell The Unit of Life Test - 68

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SHARING IS CARING

Question 1

Active process

Passive process

All types of processes

None of the above.

Question 2

Lysosomes

Cytosol

Ribosomes

Golgi apparatus.

Solution

Question 3

The DNA is complexed with histone in prokaryotes

The DNA is circular and single stranded in prokaryotes

Repetitive sequences are present in eukaryotes

Genes in the former case are organised into operons

Solution

Question 4

ER

Mesosome

Peroxisome

Ribosome

Solution

Question 5

Cell wall

Mitochondria

Endoplasmic reticulum

Cytoplasm

Solution

Question 6

They divide in synchrony with cell cycle

They contain DNA

They contain cristae

They store and release chemical energy

Solution

Question 7

Intracellular digestion

Extracellular digestion

Fat breakdown

Both (A) and (B)

Solution

Question 8

Nervous system

Emergency

Formation of special membrane Iipids

Synthesis of secretory proteins

Solution

Question 9

Centriole

Lysosome

Chromoplast

Chloroplast

Solution

Question 10

Proteins

Lipids

Carbohydrates

Nucleotides

Solution

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