The Fundamental Unit of Life Test

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The Fundamental Unit of Life Test - 34

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Weekly Quiz Competition

Question 1
1 / -0

The plant cell cytoplasm is surrounded by both cell wall and cell membrane. The specificity of transport of substances is mostly cross the cell membrane, because.

A
Cell membrane is impermeable

B
Cell membrane is selectively permeable

C
Cell membrane is fully permeable

D
Cell wall is impermeable
Question 2
1 / -0

What does $$A, B$$ and $$C$$ represent in the given figure of a chromosome?

A
A - Centriole, B - Satellite, C - Primary constriction

B
A - Centriole, B - Satellite, C - Secondary constriction

C
A - Centromere, B - Satellite, C - Secondary constriction

D
A - Centromere, B - Satellite, C - Primary constriction

Solution

Centromere is a non-stainable area, also called as primary constriction. Secondary constrictions are narrower than the primary constriction. These are necessary for the formation of nucleolus (which is formed in the post mitotic reconstruction phase). The area of a chromosomes distal to the nucleolar organiser is called satellite or trabant. The presence or formation of satellite is called satellitism. Satellite may be small and knob like. A chromosome having satellite is called as sat chromosome.
So, the correct answer is 'A - Centromere, B - Satellite, C - Secondary constriction'.
Question 3
1 / -0

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 4
1 / -0

Plant cells have .......... and .........., which are not present in animal cells.

A
Mitochondria and chloroplasts

B
Cell membranes and cell walls

C
Chloroplasts and nucleus

D
Chloroplasts and cell wall

Solution

Plant cells have chloroplast and cell wall but animals cells don't have it because plant cells need to be rigid to maintain its posture and need chlorophyl for food production which is present in the chloroplast. But there is no need for cell rigidity in animals and they are heterotrophs so do not have chloroplast.
So, the correct answer is option D- 'Chloroplasts and cell wall'.
Question 5
1 / -0

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 6
1 / -0

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 7
1 / -0

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 8
1 / -0

Eukaryotic cell differs from prokaryotic cell in having

A
Single envelop system

B
Nucleoid

C
70S ribosomes

D
Nucleus

Solution

A prokaryotic organism does not have a membrane-bound nucleus or a true nucleus. Instead of a nucleus, nucleoids are seen. It also lacks many of the membrane-bound organelles but contains ribosomes, cytoplasm, etc. But eukaryotic organisms possess a true membrane-bound nucleus.
So the correct answer is the nucleus.
Question 9
1 / -0

Which of the following statement is/are correct for the cell cycle?

A
Cell cycle is a series of events involving cell growth and cell division that produces two new daughter cells.

B
Cell growth (in terms of cytoplasmic increase) is a discontinuous process.

C
DNA synthesis occurs only during two specific stages in the cell cycle.

D
The replicated chromosomes (DNA) are distributed to daughter nuclei prior to cell division.
Question 10
1 / -0

The thread like structure present in the nucleus is

A
Nucleolus

B
Gene

C
Chromosome

D
Ribosome

Solution

The thread like structures present in the nucleus are called the chromosomes or the chromatin, when the degree of condensation is very less.
A. Nucleolus is the region on the chromosomes that codes for the ribosomal RNA.
B. Genes are the segments of DNA that code for the proteins. These are located on the chromosomes.
C. The chromosomes are the thread like structures made up of DNA and proteins and are present in the DNA.
D. Ribosomes are the ribo-nucleoproteins present in the cytoplasm that take part in protein formation.
Hence, the correct answer is 'Chromosomes'

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The Fundamental Unit of Life Test - 34

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The Fundamental Unit of Life Test - 34

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Question 1

Cell membrane is impermeable

Cell membrane is selectively permeable

Cell membrane is fully permeable

Cell wall is impermeable

Question 2

A - Centriole, B - Satellite, C - Primary constriction

A - Centriole, B - Satellite, C - Secondary constriction

A - Centromere, B - Satellite, C - Secondary constriction

A - Centromere, B - Satellite, C - Primary constriction

Solution

Question 3

DNA synthesis

RNA synthesis

Synthesis of ribosomal subunits

Protein synthesis

Solution

Question 4

Mitochondria and chloroplasts

Cell membranes and cell walls

Chloroplasts and nucleus

Chloroplasts and cell wall

Solution

Question 5

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 6

The largest organelle in the cell

The organelle which contains chromosomes

The organelle with a double membrane

All of the above

Solution

Question 7

Endoplasmic reticulum

Cell membrane

Plasma membrane

None of the above

Solution

Question 8

Single envelop system

Nucleoid

70S ribosomes

Nucleus

Solution

Question 9

Cell cycle is a series of events involving cell growth and cell division that produces two new daughter cells.

Cell growth (in terms of cytoplasmic increase) is a discontinuous process.

DNA synthesis occurs only during two specific stages in the cell cycle.

The replicated chromosomes (DNA) are distributed to daughter nuclei prior to cell division.

Question 10

Nucleolus

Gene

Chromosome

Ribosome

Solution

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