Cell The Unit of Life Test

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Cell The Unit of Life Test - 29

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Weekly Quiz Competition

Question 1
1 / -0

Transporting channels of the cell are called as__________________

A
Endoplasmic reticulum

B
Golgi bodies

C
Lysosomes

D
Vacuoles

Solution

The endoplasmic reticulum is also called as ER. It is of two forms: RER and SER. RER stands for Rough ER and SER stands for Smooth ER. Rough ER has ribosomes attached to it and thus, helps in protein synthesis. ERs have several functions in cells. One of their major functions is to act as a channel for transport. Secretory proteins, mostly glycoproteins, are moved across the endoplasmic reticulum membrane.
Question 2
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........... determines the function and development of the cell.

A
Nucleus

B
Ribosome

C
Chloroplast

D
Golgi body
Solution
- The nucleus regulates all cellular activities by controlling the enzymes required for cellular processes.
- Enzymes are proteins and protein synthesis is controlled by the nucleus.
- The mRNA required for protein synthesis is made from DNA, which is situated in the nucleus.
Hence the correct option is A.
Question 3
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Which of the following cell organelles digests and removes dead contents of a cell?

A
Ribosomes

B
Lysosomes

C
Centrosomes

D
Golgi complex

Solution

Lysosomes are the membrane-bounded organelles present in the cell. These have digestive enzymes like lipase and hydrolase which helps to digest the dead and worn out cells. It removes the cell debris and these are also known as suicidal bags of the cell.
So, the correct answer is option B.
Question 4
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If the contents of a leaf tissue are carefully fractioned, which fractions is said to be alive?

A
Mitochondria

B
ER

C
Cell wall

D
Ribosome

Solution

Mitochondria are cell organelles that play an important role in ATP production. It has its own genetic material. As a result it are capable of self replication and can remain alive for some time when removed from the cell by its self duplication property. Hence mitochondria is said to be alive. Thus the correct answer is option A.
Question 5
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One key function of nuclear pore is to

A
Allow cells to communicate with one another

B
Aid in the production of new nuclei

C
Allow molecules such as proteins to move into and out of the nucleus

D
For connections between different organelles

Solution

Eukaryotic cells have a membrane-bounded nucleus. Nuclear pore protein complexes act as a channel that helps in the transport of molecules from nucleoplasm to outside the nucleus. It is also involved in chromatin organization, gene expression regulation and DNA repair, etc.
Question 6
1 / -0

Which of the labeled parts of the cell is its controlling centre?

A
P

B
Q

C
R

D
S

Solution

The given diagram is plant cell because cell is surrounded by the cell wall and have single large vacuole at the center of the cell whereas nucleus (P) is present at the side of the vacuole. The nucleus is called as the regulatory body of the cell or brain of the cell because it contains the genetic material and controls the cellular activities by controlling the protein synthesis. Whereas Q represents the vacuole, R represents the mitochondria, S represents the cytoplasm.
Question 7
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The site of protein synthesis in plant is _____________.

A
Choloroplast

B
Ribosomes

C
Lysosome

D
Mitochondria
Solution
Ribosomes are the primary site of protein synthesis or translation. They are composed of two major components; the small ribosomal subunit which reads the RNA and the large subunit which joins amino acids to form a polypeptide chain.
Lysosomes are known as suicidal bags of the cell. It has several hydrolytic and digestive enzyme.
Mitochondria, the powerhouse of the cell are the site of cellular respiration.
Chloroplasts are the site of photosynthesis. The light reaction takes place in the thylakoid while the dark reaction takes place in the stroma of the chloroplast.
So, the correct answer is option B.
Question 8
1 / -0

Rough endoplasmic reticulum is related to which of the following?

A
Protein synthesis

B
Fat synthesis

C
Respiration

D
Photosynthesis

Solution

Rough Endoplasmic Reticulum (RER) is a type of the endoplasmic reticulum to which ribosomes are attached on the cytoplasmic side. They are involved in the biosynthesis of proteins for export to the outside of the cell and enzymes to be incorporated into cellular organelles such as lysosomes.
Question 9
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Name the plastid that is white in colour (pigment-free).

A
Chloroplast

B
Lysosome

C
Leucoplast

D
Chromoplast
Solution
- Plastids are the organelles found only in plant cells. These are of three types, namely, chloroplast, i.e., green plastid, non-green chromoplast, and leucoplasts. Leucoplasts are non-pigmented or colorless plastids that are used for the storage of starch and oils.
Thus, the correct answer is option C.
Question 10
1 / -0

The diagrams given below are the organelles of a cell. Which of the following organelles is responsible for mechanical support and enzyme transport?

A

B

C

D

Solution

Endoplasmic reticulum helps in mechanical support and enzyme transport. Smooth endoplasmic reticulum synthesises lipids which form an integral part of the plasma membrane and helps in mechanical support. The rough endoplasmic reticulum synthesises enzymatic proteins which are transported to Golgi apparatus for further modification.
So, the correct answer is option B.