Cell The Unit of Life Test

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Cell The Unit of Life Test - 71

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Weekly Quiz Competition

Question 1
1 / -0

Which type of cell would probably provide the best opportunity to study lysosomes?

A
Muscle cell

B
Nerve cell

C
Phagocytic white blood cell

D
Bacterial cell

Solution

Phagocytic white blood cell principal activity is the engulfing of foreign or dead cellular or microbiological material and it has an active lysosomal apparatus. Muscle cells are rich in sarcoplasmic reticulum while the nerve cells are rich in the Nissl's granules. The bacteria cell does not have the lysosomes because it is a prokaryotic cell.
Hence, the correct answer is 'Phagocytic white blood cell'.
Question 2
1 / -0

Which of the following structure is not bounded by a cell membrane

A
Ribosomes

B
Lysosomes

C
Mitochondria

D
Spherosomes

Solution

Ribosomes are organelles found in the cells. They are involved in the synthesis of proteins. They usually lack membrane and are found freely floating in the cytoplasm. However, during protein synthesis they become membrane bound but lose it as soon as their role in protein synthesis is completed.
So, the correct answer is 'Ribosomes'.
Question 3
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In almost all cases polypeptides are synthesized:

A
On ribosomes

B
Directly off DNA

C
Within mitochondria

D
In the nucleus

Solution

The ribosome takes part on translation process and it has A-site and P-site for formation of polypeptide chain. A-site holds the amino acid and transfer it to p-site for formation of the polypeptide chain.
So, the correct option is 'A'.
Question 4
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The nucleus is not an important site of:

A
DNA synthesis

B
RNA synthesis

C
Synthesis of ribosomal subunits

D
Protein synthesis

Solution

The nucleus is a spherical organelle which is present in eukaryotic cells. The main function of the nucleus is to control gene expressions. It synthesizes RNA and DNA. Protein synthesis takes place in ribosomes in the cytoplasm.
Hence, the correct answer is option D.
Question 5
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Which is not a characteristic of mitochondria?

A
Mitochondria are the sites of cellular respiration

B
Mitochondria are found in prokaryotic and eukaryotic cells

C
Mitochondria contain DNA and ribosomes

D
Inner space of the mitochondrion contains a fluid matrix

Solution

Prokaryotes are single-celled organisms that lack a nucleus and other membrane-bound organelles in them. The mitochondria are not found in prokaryotic cells. Eukaryotic cells are more advanced than the prokaryotic cells. They contain membrane-bound organelles, so mitochondria are present in eukaryotic cells. Mitochondria are the site of cellular respiration that contain their own DNA and proteins which further proves their endosymbiotic origin.
Hence, the correct answer is 'Mitochondria are found in prokaryotic and eukaryotic cell'.
Question 6
1 / -0

Which is a true statement about ribosomes?

A
Ribosomes contain DNA and protein

B
Ribosomes are active in carbohydrate synthesis

C
Ribosomal subunits leave the nucleus and form ribosomes in the cytoplasm

D
Polyribosomes are the subunits of ribosomes
Question 7
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Lysosomes function in:

A
Protein synthesis

B
Lipid synthesis

C
Intracellular digestion

D
Processing and packaging

Solution

Inside a cell, numerous organelles function to remove wastes. One of the key organelles involved in digestion and waste removal is Lysosome because they are filled with hydrolytic enzymes. These are also involved in the removal of worn-out organelles. For this reason, they are called the suicide bags of the cell.
Hence, the correct answer is 'intracellular digestion'.
Question 8
1 / -0

Choose the correct answer from the alternatives given.
If a cell is placed in an isotonic solution, what will occur?

A
Salts will move into the cell from the surrounding solution

B
Water will move into the cell from the surrounding solution

C
Salts will move out of the cell into the surrounding solution

D
None of the above will occur

Solution

Two or more isotonic solutions are those that have the same osmotic pressure across a semipermeable membrane. When a cell is placed in an isotonic solution, there will be no or equal exchange of salts between them; hence, then cells will neither shrink nor burst and there will be no movement of salts between the cells and the surrounding solution.

So, the correct answer is 'None of the above will occur'.
Question 9
1 / -0

Gas vacuole, Single envelope system, Cytoskeleton, Non-cellulosic wall, Microfilaments, Cytoplasmic streaming, Lack of cell organelles.
How many of the above features are associated with prokaryotic cell?

A
Seven

B
Six

C
Four

D
Three
Question 10
1 / -0

All of the following are associated with the role of ribosomes except

A
several ribosomes are often attached to and translating the same mRNA

B
joining amino acids together to form a polypeptide

C
prevents the anticodon of tRNA from aligning the associated amino acid in the wrong position in the developing strand

D
no protein synthesis within a cell would occur without ribosomes

Solution

Ribosomes are the cell organelles present in the cytoplasm of an organism. It has two subunits one smaller and the other larger. They help in the process of translation (Protein synthesis). Several ribosomes are attached to the mRNA and the RNA polymerase also attaches to it which helps in the translation of mRNA and results in the formation of respective proteins. They also help in the formation of long polypeptide chains of proteins and joining of many amino acids. Ribosomes are the most important organ for the synthesis of proteins without which no proteins will form. The ribosomes are attached to the lining of rough endoplasmic reticulum which has ribosomes on the surface of it. So, the correct answer is 'prevents the anticodon of tRNA from aligning the associated amino acid in the wrong position in the developing strand'.

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Re-Attempt Weekly Quiz Competition

Cell The Unit of Life Test - 71

Result

Cell The Unit of Life Test - 71

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SHARING IS CARING

Question 1

Muscle cell

Nerve cell

Phagocytic white blood cell

Bacterial cell

Solution

Question 2

Ribosomes

Lysosomes

Mitochondria

Spherosomes

Solution

Question 3

On ribosomes

Directly off DNA

Within mitochondria

In the nucleus

Solution

Question 4

DNA synthesis

RNA synthesis

Synthesis of ribosomal subunits

Protein synthesis

Solution

Question 5

Mitochondria are the sites of cellular respiration

Mitochondria are found in prokaryotic and eukaryotic cells

Mitochondria contain DNA and ribosomes

Inner space of the mitochondrion contains a fluid matrix

Solution

Question 6

Ribosomes contain DNA and protein

Ribosomes are active in carbohydrate synthesis

Ribosomal subunits leave the nucleus and form ribosomes in the cytoplasm

Polyribosomes are the subunits of ribosomes

Question 7

Protein synthesis

Lipid synthesis

Intracellular digestion

Processing and packaging

Solution

Question 8

Salts will move into the cell from the surrounding solution

Water will move into the cell from the surrounding solution

Salts will move out of the cell into the surrounding solution

None of the above will occur

Solution

Question 9

Seven

Six

Four

Three

Question 10

several ribosomes are often attached to and translating the same mRNA

joining amino acids together to form a polypeptide

prevents the anticodon of tRNA from aligning the associated amino acid in the wrong position in the developing strand

no protein synthesis within a cell would occur without ribosomes

Solution

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