Cell The Unit of Life Test

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Cell The Unit of Life Test - 92

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Weekly Quiz Competition

Question 1
1 / -0

Unlike eukaryotic cells, prokaryotic cells

A
Lack a plasma membrane

B
Do not have a nucleus

C
Have RNA, not DNA

D
All of the above

Solution

Eukaryotic cells have membrane-bound organelles and have a true nucleus whereas prokaryotic cells do not have a true nucleus. The prokaryotic cells have a nucleoid region where the chromosome lies.
Hence, the correct answer is 'Do not have a nucleus'.
Question 2
1 / -0

Prokaryotic cells differ from eukaryotic cells in the

A
Presence of cell membrane

B
Absence of histones

C
Presence of chromosomes

D
Absence of cell wall

Solution

Histones are the proteins which wrap the DNA. These are highly alkaline proteins and arrange the DNA into structural units called nucleosomes. Histones are the main proteins in chromatins of the eukaryotic cells. They are not present in prokaryotes.
Hence, the correct answer is 'Absence of histones'.
Question 3
1 / -0

In mammals, the mitochondrial ribosome is ______.

A
$$55$$S

B
$$70$$S

C
$$80$$S

D
$$100$$S

Solution

Mammalian mitochondrial ribosomes are 55 S. These are involved in the formation of mitochondrial protein. They differ from bacterial (70s) and cytoplasmic ribosomes (80s).
This the correct answer is option A.
Question 4
1 / -0

Ribosomes in animal cell were discovered by _______.

A
Robinson and Brown

B
Palade and Claude

C
Robert Hooke

D
Porter

Solution

Ribosomes were first seen by Claude in 1941 but in animal cells ribosomes were first discovered by George Emil Palade, using an electron microscope, as dense particles or granules.
So, the correct answer is option B.
Question 5
1 / -0

Active and passive transports across cell membrane differ in

A
Passive transport is non-selective

B
Passive transport is along the concentration gradient while active transport is due to metabolic energy

C
Active transport is more rapid

D
Passive transport is confined to anions while active transport in confined to cations.

Solution

Active transport is selective for a particular ion and it allows only those ions to pass through it.
example.sodium /potassium channel,calcium channel.
Passive transport is non-selective it occurs along the concentration gradient so this kind of channel allows to transport of many types of ions across the membrane. No, particularity is there for ions transport.
Question 6
1 / -0

Site of formation of immature ribosomal subunits in a eukaryotic cell is:

A
Nucleus

B
Nucleolus

C
Nuclear pore complex

D
Cytoplasm

Solution

The nucleolus makes ribosomal subunits from proteins and ribosomal RNA, also known as rRNA.It sends the subunits out to the rest of the cell where they combine into complete ribosomes during the process of formation of proteins.
Hence, the correct answer is 'nucleolus'.
Question 7
1 / -0

Which of the following is not a feature of prokaryotic cells?

A
Chlorophyll not located in chloroplasts.

B
Absence of organelles bounded by membranes

C
Only one chromosome located in the nucleus

D
Flagella that lack the 9 + 2 pattern of fibrils

Solution

Prokaryotes lack an organized nucleus and other membrane-bound organelles. Prokaryotic DNA is found in a central part of the cell called the nucleoid. The cell wall of the prokaryote acts as an extra layer of protection that helps maintain cell shape and prevents dehydration.
Hence, the correct answer is 'One one chromosome located in the nucleus'.
Question 8
1 / -0

A eukaryotic organelle that can best be seen with the light microscope is the:

A
Endoplasmic reticulum

B
Nucleus

C
Polyribosome

D
Microtubule

Solution

The nucleus is a membrane-bound organelle that is seen under a light microscope because of its large size. These are spherical in shape and encompass nuclear membrane, chromosomes, nucleoplasm, and nucleolus. It contains the cell's genetic material.
Hence, the correct answer is 'Nucleus'.
Question 9
1 / -0

Mitochondria and chloroplasts are suggested to have evolved from symbiotic prokaryotes present in primitive eukaryotic cells. One evidence for this is that:

A
These organelles contain cristae or thylakoids

B
These organelles contain electron transport chain

C
The genetic code in these organelles is same as in all organisms

D
The ribosomes in these organelles share properties with those of prokaryotes
Solution
- Such Evidences are following
- Mitochondria and chloroplasts are the same size as prokaryotic cells and divide by binary fission.
- Mitochondria and chloroplasts have their own DNA which is circular, not linear.
- Mitochondria and chloroplasts have their own ribosomes which have 30S and 50S subunits, not 40S and 60S.
- So, the correct option is 'D
Question 10
1 / -0

Protein synthesis is associated with

A
Cell membrane

B
Nuclear membrane

C
Ribosomes

D
Mitochondria

Solution

Ribosomes exist along the membranes of the endoplasmic reticulum in eukaryotic cells or free in the cytoplasm of prokaryotic cells and protein synthesis is associated with ribosomes.
Hence, the correct answer is 'Ribosomes'.

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Cell The Unit of Life Test - 92

Result

Cell The Unit of Life Test - 92

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SHARING IS CARING

Question 1

Lack a plasma membrane

Do not have a nucleus

Have RNA, not DNA

All of the above

Solution

Question 2

Presence of cell membrane

Absence of histones

Presence of chromosomes

Absence of cell wall

Solution

Question 3

$$55$$S

$$70$$S

$$80$$S

$$100$$S

Solution

Question 4

Robinson and Brown

Palade and Claude

Robert Hooke

Porter

Solution

Question 5

Passive transport is non-selective

Passive transport is along the concentration gradient while active transport is due to metabolic energy

Active transport is more rapid

Passive transport is confined to anions while active transport in confined to cations.

Solution

Question 6

Nucleus

Nucleolus

Nuclear pore complex

Cytoplasm

Solution

Question 7

Chlorophyll not located in chloroplasts.

Absence of organelles bounded by membranes

Only one chromosome located in the nucleus

Flagella that lack the 9 + 2 pattern of fibrils

Solution

Question 8

Endoplasmic reticulum

Nucleus

Polyribosome

Microtubule

Solution

Question 9

These organelles contain cristae or thylakoids

These organelles contain electron transport chain

The genetic code in these organelles is same as in all organisms

The ribosomes in these organelles share properties with those of prokaryotes

Solution

Question 10

Cell membrane

Nuclear membrane

Ribosomes

Mitochondria

Solution

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