Cell The Unit of Life Test

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Cell The Unit of Life Test - 55

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Weekly Quiz Competition

Question 1
1 / -0

Suggest which among the following is not a function attributed to endoplasmic reticulum?

A
Detoxification of poisons and drugs

B
Digestion/ egestion of foreign materials outside the cell

C
Manufacture of fat and lipid molecules

D
Biogenesis of membrane proteins

Solution

The endoplasmic reticulum is involved in the detoxification of the poisons and the drugs. This is the main function of the endoplasmic reticulum in the liver. The manufacturing of the lipids and fat molecules take place in the smooth ER. The membrane proteins are synthesised on the ribosomes which are present on the surface of the ER. The digestion and egestion of the foreign materials which enter the cells take place in the lysosomes.
Thus, the correct answer is option B.
Question 2
1 / -0

__________ is a prokaryote.

A
Amoeba

B
Bacteria

C
Yeast

D
Fungus

Solution

Bacteria are examples of the prokaryotic cell.
In general, prokaryotic cells do not have a membrane-bound nucleus. In fact "pro-karyotic" is Greek for "before nucleus".
Hence B is the correct option.
Question 3
1 / -0

Which of the following is always absent in prokaryotic cells?

A
Ribosome

B
Mitochondria

C
DNA

D
Cell wall
Solution
- A prokaryotic cell is a primitive cell which lacks membrane-bounded organelles and an organised nucleus.
- Mitochondria is a membranous structure which is present in the eukaryotic cell and absent in prokaryotes.
- There primary function is production of energy in form of ATP.
- So, the correct answer is option B.
Question 4
1 / -0

Which of the following sentences is correct?

A
Cells of all living organisms have a nucleus

B
Both animal and plant cells have a well defined cell wall

C
In prokaryotes there are no membrane bound cell organelles

D
Cells are formed de novo from abiotic materials
Solution
Prokaryotes are living cells but they lack an organised nucleus. The genetic material lies in the cytoplasm. So the statement is incorrect.
A plant cell has a well defined cell wall while animal cell starts with the plasma membrane they lack a cell wall. So the statement is incorrect.
Prokaryotes are a primitive cell which lacks membrane-bounded organelles. So the statement is correct.
Cells are basically formed by pre-existing cell and biomolecules which are considered as biotic materials. So the statement is incorrect.
Thus, the correct answer is an option C.
Question 5
1 / -0

Which one of the following is not included under endomembrane system?

A
Endoplasmic reticulum

B
Mitochondria

C
Lysosome

D
Vacuole

Solution

The endomembrane system is composed of the membranous structures in the cell. The common structures which are included are the lysosome, vesicles, vacuoles, cell membrane, endoplasmic reticulum, nuclear membrane, etc. Mitochondria is not included under endomembrane system.
Thus, the correct answer is option B.
Question 6
1 / -0

The type of ribosomes found in prokaryotic cells is

A
100S

B
80S

C
60S

D
70S

Solution

Prokaryotes are unicellular organisms that lack membrane-bound cell organelles. Ribosomes are the organelles made up of proteins and RNA molecules called subunits. These are involved in protein synthesis. The prokaryotic ribosomes are of 70S type, unlike the eukaryotic ribosomes which are of 80S type. The 70S ribosomes are made of 50S and 30S subunits. Thus the correct answer is option D.
Question 7
1 / -0

If you fractionate all the organelles from the cytoplasm of a plant cell, in which one of the following sets of fractions will you find nucleic acids?

A
Nucleus, mitochondria, chloroplast, cytoplasm

B
Nucleus, mitochondria, chloroplast, glyoxysome

C
Nucleus, chloroplast, cytoplasm and peroxisome

D
Nucleus, mitochondria, chloroplast, Golgi bodies

Solution

Nucleic acids are DNA and RNA. The nucleus of plant cells has the genetic material in the form of DNA. Also, the mitochondria show the presence of linear and circular DNAs of varying sizes. Similarly, the chloroplast has genome in the form of DNA. The mRNA migrates from the nucleus to ribosomes in the cytoplasm where the proteins are assembled. Hence when all the organelles from the cytoplasm of a plant cell are fractionated the nucleic acids will be found in the nucleus, mitochondria, chloroplast, and cytoplasm. Thus, the correct answer is option A.
Question 8
1 / -0

Mitochondria are

A
Suicidal bags

B
Power houses of cells

C
Carrier of genetic information

D
Site of protein biosynthesis
Solution
Correct Answer: B
Explanation:
Mitochondria are the double membranous cell organelles found in the eukaryotic cells.
Mitochondria use molecular oxygen to oxidise the carbohydrates and fats (lipids) present in the cell to carbon dioxide and water vapour.
Oxidation releases energy in the form of ATP which is used in different other metabolic pathways.
Since, mitochondria synthesise, energy-rich compounds (ATP), they are known as powerhouses of the cell.
Question 9
1 / -0

DNA is not associated with histones in

A
Prokaryotes

B
Eukaryotes

C
Fungi

D
Animals

Solution

Prokaryotes are unicellular organisms without membrane-bound organelles. They lack a true nucleus. Instead, they have nucleoid, a genetic material without the nuclear envelope. In prokaryotes, the genetic material is single circular double-stranded DNA without histones. They have a haploid chromosome.
Thus, the correct answer is 'Prokaryotes.'
Question 10
1 / -0

Prokaryotes are characterized by

A
Absence of internal compartmentalisation

B
Absence of nucleus

C
$$70$$S ribosome

D
All the above

Solution

Prokaryotes are unicellular organisms that lack membrane-bound organelles. They also lack true nucleus. They have nucleoid, genetic material without nuclear envelope. They posses ribosomes in the cytoplasm. They are also characterized by absence of internal compartmentalisation. All prokaryotes have 70S ribosomes. The 70S ribosome is made up of a 50S and 30S subunits. Examples of prokaryotes include bacteria, cyanobacteria.
Thus, the correct answer is 'All the above.'

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Re-Attempt Weekly Quiz Competition

Cell The Unit of Life Test - 55

Result

Cell The Unit of Life Test - 55

Score

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Rank

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SHARING IS CARING

Question 1

Detoxification of poisons and drugs

Digestion/ egestion of foreign materials outside the cell

Manufacture of fat and lipid molecules

Biogenesis of membrane proteins

Solution

Question 2

Amoeba

Bacteria

Yeast

Fungus

Solution

Question 3

Ribosome

Mitochondria

DNA

Cell wall

Solution

Question 4

Cells of all living organisms have a nucleus

Both animal and plant cells have a well defined cell wall

In prokaryotes there are no membrane bound cell organelles

Cells are formed de novo from abiotic materials

Solution

Question 5

Endoplasmic reticulum

Mitochondria

Lysosome

Vacuole

Solution

Question 6

100S

80S

60S

70S

Solution

Question 7

Nucleus, mitochondria, chloroplast, cytoplasm

Nucleus, mitochondria, chloroplast, glyoxysome

Nucleus, chloroplast, cytoplasm and peroxisome

Nucleus, mitochondria, chloroplast, Golgi bodies

Solution

Question 8

Suicidal bags

Power houses of cells

Carrier of genetic information

Site of protein biosynthesis

Solution

Question 9

Prokaryotes

Eukaryotes

Fungi

Animals

Solution

Question 10

Absence of internal compartmentalisation

Absence of nucleus

$$70$$S ribosome

All the above

Solution

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