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Biology NCERT > Cell: The Unit of Life > Flashcards

Cell: The Unit of Life Flashcards

1
Q

First living cell was described by

A

Anton Von Leeuwenhoek

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2
Q

Nucleus was discovered by

A

Robert Brown

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3
Q

Cell theory was given by

A

Schleiden and Schwann

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4
Q

Omnis cellula-e-cellula was said by

A

Rudolf Virchow

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5
Q

Cell theory is not applicable to

A

Virus

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6
Q

Main area of various types of activities in a cell is

A

Cytoplasm

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7
Q

Cell organelle found in every living cell is

A

Ribosome

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8
Q

True/False :- Ribosome is membrane bound cell organelle found in both prokaryotes and eukaryotes

A

False. It is non-membrane bound cell organelle.

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9
Q

Largest single isolated cell is

A

Egg of ostrich

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10
Q

In a prokaryotic cell the ratio of A + T and G + C is?

a) >1
b) <1
c) = 1
d) None of these

A

b) <1

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11
Q

True/False :- Prokaryotes have complex cell envelope

A

True.

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12
Q

Between prokaryotes and eukaryotes which cell undergo rapid multiplication?

A

Prokaryotic cell divide more rapidly than eukaryotic cell

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13
Q

True/False :- Cell surface structures of bacteria pili and fimbriae helps in locomotion

A

False. They don’t help in locomotion.

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14
Q

Prokaryotic ribosome is

  1. 70S
  2. 80S
  3. 60S
  4. 90S
A

70S

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15
Q

Prokaryotic ribosomal sub-units are

A

50S and 30S

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16
Q

Eukaryotic ribosome is

  1. 70S
  2. 80S
  3. 60S
  4. 90S
A

80S

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17
Q

S in 70S and 80S ribosome refers to

A

Svedberg’s unit. It stands for sedimentation coefficient

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18
Q

Ribosomes found in chloroplast is

  1. Prokaryotic ribosome
  2. Eukaryotic ribosome
A
  1. Prokaryotic ribosome

The ribosomes of chloroplast are smaller (70S) than the cytoplasmic ribosomes (80S).

19
Q

In lipid bilayer head is

  1. Polar
  2. non-polar
A
  1. Polar
20
Q

In lipid bilayer of cell membrane tail is

  1. polar
  2. non-polar
A
  1. non-polar
21
Q

Which molecules require carrier protein to facilitate their diffusion through the cell

  1. Polar molecules
  2. Non-polar molecules
  3. Neutral molecules
A
  1. Polar molecules
22
Q

Cell wall is

  1. Living
  2. Non-living
A
  1. Non-living
23
Q

Fungal cell wall is made up of

  1. Chitin
  2. Cellulose
A
  1. Chitin
24
Q

A is found in plants but not in animals
B is found in animals but not in plants

A and B are respectively

  1. Cell wall and plastids
  2. Plastids and large central vacuole
  3. Plastids and centrioles
  4. Centrioles and plastids
A
  1. Plastids and centrioles
25
Q

Compartmentalisation of cytoplasm is found in

  1. Prokaryotes
  2. Eukaryotes
A
  1. Eukaryotes
26
Q

Which of the following doesn’t belong endomembrane system

  1. Vacuoles and mitochondria
  2. Lysosomes and Golgi apparatus
  3. Plastids and vacuoles
  4. Plastids and mitochondria
A
  1. Plastids and mitochondria
27
Q

Which of the following is colourless plastid

  1. Chloroplasts
  2. Chromoplasts
  3. Leucoplasts
A
  1. Leucoplasts
28
Q

Which of the following plastid store carbohydrates

  1. Amyloplasts
  2. Elaioplasts
  3. Aleuroplasts
A
  1. Amyloplasts
29
Q

True/False :- Centriole is an organelle which contains two centrosomes which lie perpendicular to each other

A

False.
Correct statement is
Centrosome is an organelle which contains two centrioles which lie perpendicular to each other

30
Q

Cis and trans face of Golgi apparatus are

  1. Convex and concave respectively
  2. Concave and convex respectively
A
  1. Convex and concave respectively
31
Q

True/False :- Nucleolus is a membrane bound structure

A

False. It is non-membrane structure

32
Q

True/False :- Centromere in Telocentric chromosome is situated closed to the end of chromosome

A

False. Centromere in telocentric chromosome is at the tip of chromosome

33
Q

True/False :- Flagella of prokaryotes are filamentous

A

True

34
Q

True/False :- Ribosomes are the site of protein synthesis

A

True

35
Q

True/False :- Endoplasmic reticulum is found scattered in cytoplasm too

A

True

36
Q

Smooth endoplasmic reticulum is the major site for

  1. Lipid synthesis
  2. Protein synthesis
A
  1. Lipid synthesis
37
Q

The infoldings of inner membrane of mitochondria is called

  1. Cisternae
  2. Cristae
A
  1. Cristae
38
Q

Site of rRNA synthesis in cell is

A

Nucleolus

40
Q

Cell theory is

A
  1. All living organisms are composed of cells and products of cells
  2. All cells arise from pre-existing cells
41
Q

Schleiden observed

A

All plants are composed of cells which form the tissues of the plant

42
Q

Schwann reported that

A
  1. Cells had thin outer layer (today known as plasma membrane)
  2. Presence of cell wall is a unique character of plant cells.
43
Q

True/False :- Shape of the cell varies with the function they perform

A

True

44
Q

Omnis cellula-e-cellula means

A

New cells are formed from pre-existing cells

Biology NCERT (9 decks)

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