Cell The Unit of Life Test

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Cell The Unit of Life Test - 81

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Weekly Quiz Competition

Question 1
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Which of the following statements about Rhizobium legume nodule formation is not true?

A
Rhizobium can only fix nitrogen after it become a Bacteroide within a root cortex cell

B
Rhizobium induces invagination of root hairs

C
Within an infection thread, Rhizobium is till extracellular to the plant

D
The infection thread can fuse with any root cell of an appropriate legume species

Solution

The infection thread can fuse with any root cell of an appropriate legume species. Infective threads fuse preferentially with root cortex cells.
So, the correct option is option D.
Question 2
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Which is a semiautonomous organelle?

A
Lysosome

B
Prokaryon

C
Chloroplast

D
Endoplasmic reticulum

Solution

Mitochondria and chloroplasts are the two cellular organelles which are descended from the bacterial cell.
Therefore, they possess their own DNA and are called semi-autonomous cell organelles.
So, the correct answer is 'Chloroplast'.
Question 3
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Endoplasmic reticulum sometime contains?

A
Ribosomes

B
Lysosomes

C
Golgi bodies

D
None of these

Solution

Rough endoplasmic reticulum, (RER), has large numbers of ribosomes attached to the outer surfaces of the lamella membranes. These ribosome-rich areas play an important role in the production, storage and export of proteins. Special enzymes in the ER carry out this process.
Question 4
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Secretory proteins are synthesized in the ___________.

A
Golgi apparatus

B
Smooth Endoplasmic Reticulum

C
Ribosomes present on the surface of RER

D
Rough Endoplasmic Reticulum (RER)
Solution
- Secretory proteins, membrane proteins or any other type of proteins all are synthesized by ribosomes attached to the cisternae of the endoplasmic reticulum and translocated to the lumen of the endoplasmic reticulum.
- Some post-translational modifications occur in the Golgi apparatus.
- The smooth Endoplasmic Reticulum (SER) is involved in the synthesis of lipids, including cholesterol and phospholipids.
So, the correct answer is option C.
Question 5
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Centrosome are present?

A
In plant cell only

B
In animal cell

C
In both plant and animal cell

D
None of these

Solution

Centrosomes are organelles which serve as the main microtubule organizing centers for animal cells. A unique property of flowering plant cells is that they entirely lack centrosomes, which in animals have a major role in spindle formation.
Hence the correct answer is (B)
Question 6
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Abundant cell-organelles in the seeds of castor.

A
Lysosomes

B
Peroxisomes

C
Glyoxysomes

D
Sphaerosomes

Solution

Glyoxysomes are microbodies which contain enzymes for β−oxidation of fatty acids and glyoxylate pathway. They are considered to be special peroxisomes. They occur abundantly in germinating endosperm cells of oil seeds. So, the correct answer is 'Glyoxysomes'.
Hence the correct answer is (C)
Question 7
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Which is not correct?

A
Ribosome factory - nucleolus

B
Protein factory - ribosome

C
Euchromatin - darkly stained

D
Heterochromatin - genetically less active

Solution

C. Euchromatin - darkly stained
EXPLANATION: Euchromatin is a lightly packed form of chromatin, which is enriched in genes. 92 percent of the human genome is euchromatin. Euchromatin participates in the active transcription of DNA to mRNA products.
Question 8
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A root concentrates minerals by?

A
Active transport

B
Facilitated diffusion

C
Osmosis

D
Diffusion
Question 9
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Enzyme peptidyl transferase occurs in?

A
Larger subunit of ribosome

B
Smaller subunit of ribosome

C
Endoplasmic reticulum

D
Lysosome
Question 10
1 / -0

One of the organelles showing polarity is

A
Ribosomes

B
Vacuole

C
Golgi bodies

D
Lysosomes

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Cell The Unit of Life Test - 81

Result

Cell The Unit of Life Test - 81

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Question 1

Rhizobium can only fix nitrogen after it become a Bacteroide within a root cortex cell

Rhizobium induces invagination of root hairs

Within an infection thread, Rhizobium is till extracellular to the plant

The infection thread can fuse with any root cell of an appropriate legume species

Solution

Question 2

Lysosome

Prokaryon

Chloroplast

Endoplasmic reticulum

Solution

Question 3

Ribosomes

Lysosomes

Golgi bodies

None of these

Solution

Question 4

Golgi apparatus

Smooth Endoplasmic Reticulum

Ribosomes present on the surface of RER

Rough Endoplasmic Reticulum (RER)

Solution

Question 5

In plant cell only

In animal cell

In both plant and animal cell

None of these

Solution

Question 6

Lysosomes

Peroxisomes

Glyoxysomes

Sphaerosomes

Solution

Question 7

Ribosome factory - nucleolus

Protein factory - ribosome

Euchromatin - darkly stained

Heterochromatin - genetically less active

Solution

Question 8

Active transport

Facilitated diffusion

Osmosis

Diffusion

Question 9

Larger subunit of ribosome

Smaller subunit of ribosome

Endoplasmic reticulum

Lysosome

Question 10

Ribosomes

Vacuole

Golgi bodies

Lysosomes

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