Cell The Unit of Life Test

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Cell The Unit of Life Test - 77

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Weekly Quiz Competition

Question 1
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In the Prokaryotic cells

A
The chromosome is covered with the nuclear membrane

B
The chromosome Is not covered with the nuclear membrane

C
The chromosome is absent

D
Nucleus is present

Solution

The prokaryotic cells have a primitive or old nucleus where the chromosome is not covered with a nuclear membrane. The free chromosome freely floats in the cell cytoplasm.
Hence the correct option is B.
Question 2
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Which of the following statement about nucleus and nucleolus is correct?

A
The nucleus is membrane-bound while the nucleolus is not membrane-bound.

B
The nucleolus is membrane-bound while the nucleus is not membrane-bound.

C
Both nucleolus and nucleus are membrane-bound.

D
Both nucleus and nucleolus are not membrane-bound.

Solution

Nucleus is a membrane-bound structure which is separated from the cytoplasm by the nuclear membrane. Nuclear membrane has small pores which allow diffusion.
Nucleolus is the central dark part of the nucleus which is not surrounded by any kind of membrane. It is the site of ribosome synthesis.
So, the correct option is 'A'.
Question 3
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Nucleus is

A
The largest organelle in the cell

B
The organelle which contains chromosomes

C
The organelle with a double membrane

D
All of the above
Solution
Answer: (D) All of the above.
Explanation:
The nucleus is known as the brain of the cell.
It is a double membrane organelle.
It is the largest organelle present in the cell itself.
It contains the fundamental and basic unit of inheritance i.e. Chromosomes.
Hence, option (D) is the correct answer.
Question 4
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Which of these cells is believed to be the first cells on Earth?

A
Eukaryotic Cell

B
Animal cell

C
Plant cell

D
Prokaryotic cell

Solution

Eight hundred million years after the Earth first formed, the very first cells called the prokaryotic cells first appeared. The prokaryotic cells went through several changes in the next 1.5 billion years to form the Eukaryotic cells.
Hence the correct option is D.
Question 5
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Select the correct statement(s) regarding mitochondria.
(a) Mitochondria show a great degreee of variability in their shape and size but their number remains constant per cell.
(b) Outer membrane is compose of 80% proteins and 20% lipids.
(c) The enzymes and electron carriers for the formation of ATP are present only in the inner membrane.
(d) These are miniature biochemical factories where proteins and fats are completely reduced.

A
(a), (b) and (c)

B
(b), (c) and (d)

C
(c) and (d) only

D
(c) only

Solution

(a) The number of mitochondria per cell is variable depending on the physiological activity of the cells. In terms of shape and size also, a considerable degree of variability is observed. Typically it is sausage-shaped or cylindrical having a diameter of 0.2-1.0µm (average 0.5µm) and length 1.0-4.1µm.
(b) Each mitochondrion is a double membrane-bound structure with the outer membrane and the inner membrane dividing its lumen distinctly into two aqueous compartments, i.e., the outer compartment and the inner compartment. The inner compartment is called the matrix. The outer membrane forms the continuous limiting boundary of the organelle. The inner membrane forms a number of infoldings called the cristae towards the matrix.
(c) Mitochondria are the sites of aerobic respiration. They produce cellular energy in the form of ATP, hence they are called ‘powerhouses’ of the cell.
(d) The matrix also possesses single circular DNA molecule, a few RNA molecules, ribosomes (70s) and the components required for the synthesis of proteins.
So, the correct option is ' (c) only'.
Question 6
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Which of the following divides the intracellular space into two distinct compartments?

A
Endoplasmic reticulum

B
Cell membrane

C
Plasma membrane

D
None of the above

Solution

The endoplasmic reticulum is a network of membranous tubules within the cytoplasm of a eukaryotic cell. It is occupied close to the outer nuclear membrane. It usually has ribosomes attached and is involved in protein and lipid synthesis. The endoplasmic reticulum divides the intracellular space into two distinct compartments, viz. luminal and extra-luminal.
So, the correct answer is option A.
Question 7
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The prokaryotic cells are represented by all except_____________

A
Red algae

B
Blue green algae

C
Mycoplasma

D
Ray fungi
Solution
The prokaryotic cells are represented by all except red algae. The red algae, or Rhodophyta, are one of the oldest groups of eukaryotic algae belong to the kingdom Plantae.
The cells of red algae are eukaryotic in nature. Red algae appear red due to the presence of phycoerythrin (red pigment).
So, the correct answer is 'Red algae'.
Question 8
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What is more abundant in smooth endoplasmic reticulum?

A
Cisternae & vesicles

B
Tubules

C
Tubules and vesicles

D
Cisternae

Solution

Cisternae, they are flattened unbranched sac-like structures. They lie parallel to each other and they are inter-connected and covered with ribosomes.
Vesicles, they are round, spherical structure. They are rich in pancreatic cells. When cells are disrupted during cell fractionation, the ER breaks up into small vesicles.
Tubules, these are irregularly branched tube-like structures which form a network along with other elements. They do not possess ribosomes on their surface.
The endoplasmic reticulum in absence of ribosomes appears smooth and is called smooth endoplasmic reticulum. It composed mainly of tubules and vesicles.
So, the correct option is 'Tubules and vesicles'.
Question 9
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Which of the following organelle is surrounded by two membranes?

A
Ribosomes

B
Peroxisomes

C
Vacuoles

D
Mitochondria

Solution

Mitochondria are known as the powerhouse of the cell. It has two membranes that increase its surface area which enables it to obtain maximum productivity. The outer membrane covers all the organelles whereas the inner membrane is folded over many times to form a layered structure called cristae. So, the correct answer is 'Mitochondria'.
Question 10
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Identify the cell organelle that has hydrolyting enzymes.

A
Golgi complex

B
Lysosomes

C
Plastids

D
Mitochondria

Solution

Lysosomes is the main digestive compartment of the cell. As such, they contain a variety of enzymes capable of degrading different types of biological material, including nucleic acids, lipids, and proteins among others. A majority of the lysosomal enzymes functions inside the acidic enviornment, which is why they referred to as acid hydrolases.
So, the correct answer is 'Lysosomes'.

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Cell The Unit of Life Test - 77

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Cell The Unit of Life Test - 77

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SHARING IS CARING

Question 1

The chromosome is covered with the nuclear membrane

The chromosome Is not covered with the nuclear membrane

The chromosome is absent

Nucleus is present

Solution

Question 2

The nucleus is membrane-bound while the nucleolus is not membrane-bound.

The nucleolus is membrane-bound while the nucleus is not membrane-bound.

Both nucleolus and nucleus are membrane-bound.

Both nucleus and nucleolus are not membrane-bound.

Solution

Question 3

The largest organelle in the cell

The organelle which contains chromosomes

The organelle with a double membrane

All of the above

Solution

Question 4

Eukaryotic Cell

Animal cell

Plant cell

Prokaryotic cell

Solution

Question 5

(a), (b) and (c)

(b), (c) and (d)

(c) and (d) only

(c) only

Solution

Question 6

Endoplasmic reticulum

Cell membrane

Plasma membrane

None of the above

Solution

Question 7

Red algae

Blue green algae

Mycoplasma

Ray fungi

Solution

Question 8

Cisternae & vesicles

Tubules

Tubules and vesicles

Cisternae

Solution

Question 9

Ribosomes

Peroxisomes

Vacuoles

Mitochondria

Solution

Question 10

Golgi complex

Lysosomes

Plastids

Mitochondria

Solution

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