Tag: cell-the basic unit of life

Questions Related to cell-the basic unit of life

Jute fibres have a length of

biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

  1. $30-40mm$

  2. $300-400\mu m$

  3. $30-90cm$

  4. $3-9m$

Show answer
Correct Option: C

The smallest human cell is

biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

  1. Erythrocyte

  2. Kidney cell

  3. Liver cell

  4. Sperm

Show answer
Correct Option: A
Explanation:

  • Erythrocytes or red blood cells (RBC) are the most abundant of all the cells in the blood. A healthy adult man has, on an average, 5 million to 5.5 millions of RBCs mm–3 of blood. It is Biconcave in size.
  • A typical human red blood cell has a disk diameter of approximately 6.2–8.2 µm and a thickness at the thickest point of 2–2.5 µm and a minimum thickness in the centre of 0.8–1 µm, being much smaller than most other human cells. Hence The smallest human cell is  Erythrocyte.
  • So, the correct answer is 'Erythrocyte'.

    • Longest cell in human body may be_____________.

    biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

    1. Nerve cell

    2. Leg muscle cell

    3. Bone cell

    4. Heart muscle cell

    Show answer
    Correct Option: A
    Explanation:

    A neuron is a nerve cell that is the basic building block of the nervous system. Neurons are similar to other cells in the human body in a number of ways, but there is one key difference between neurons and other cells. Neurons are specialized to transmit information throughout the body. Nerve cell or neuron possess a cell body with a long, thin hair like axon. A nerve cell can be up to a metre long. 

    Dendrites are a part of 

    biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

    1. Grey matter

    2. White matter

    3. Dura mater

    4. Arachnoid mater

    Show answer
    Correct Option: A

    Correct arrangement of the following in increasing size is
    (i) Width of biological membrane.
    (ii) Diameter of E.coli DNA
    (iii) Human ribosome
    (iv) Length of E.coli DNA
    (v) Diameter of human liver cell.

    biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

    1. i, iii, ii, iv, v

    2. ii, i, iii, iv, v

    3. i, iii, ii, v, iv

    4. ii, iii, i, iv, v

    Show answer
    Correct Option: C
    Explanation:

    Answer :
    i) Biological Membranes are typically 7.5–10 nm in thickness with two regular layers of lipid molecules.
    ii) E coli cells are typically rod-shaped, and are about 2.0 μm long and 0.25–1.0 μm in diameter.
    iii) Prokaryotic ribosomes are around 20 nm in diameter.
    iv) E.coli chromosomes have about 4.7 x 10^6 base pairs which results in a length of 1.6 mm.
    v) Diameter of human liver cell 50–100µm
    So correct answer is option C. i, iii, ii, v, iv.

    Which of the following cells are round and biconcave in shape?

    biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

    1. White blood cells

    2. Red blood cells

    3. Columnar epithelial cells

    4. Nerve cells

    5. Mesophyll cells

    Show answer
    Correct Option: B
    Explanation:
    • An erythrocyte is a cell containing large amounts of hemoglobin and specialized for oxygen transport. In mammals, erythrocytes are round and biconcave in shape. 
    • They are devoid of nucleus and other membrane-bound organelles. They derive energy through glycolysis and serve as tiny packets of hemoglobin.

    The longest cell in the human body is

    biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

    1. Nerve cell

    2. Muscle cell

    3. Liver cell

    4. Kidney cell

    Show answer
    Correct Option: A
    Explanation:
    Nerve cell is considered as the longest cell of the body. It is the abundantly traced in the brain. It carries the nerve stimulus from the organs to the brain. It also carries the nerve response from the brain to the effector organs.
    So, the correct answer is option A.

    Which one is smallest cell?

    biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

    1. Bacteria

    2. Parenchyma

    3. PPLO

    4. Virus

    Show answer
    Correct Option: C
    Explanation:

    The cell is the structural unit of life with various shapes and size. The size of the cell ranges from 0.5 micrometers to 100 micrometers. Mycoplasma gallicepticum, a parasitic bacterium is thought to be the smallest known organisms with the size from 0.2 to 0.3 micrometer, capable of independent growth and reproduction. Later, the name for mycoplasma was pleuropneumonia-like organisms or PPLO.

    .......... are the longest cells in human body.

    biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

    1. Nerve cells

    2. Epithelial cell

    3. Mast cell

    4. Kupffer cell

    Show answer
    Correct Option: A
    Explanation:

    The tissues which cover or protect the body are called epithelial tissues. Cells of the epithelial tissues are tightly packed and have a small amount of cementing material in between them. These are small cells covering the organs and cavities of the body.  
    Mast cells are a type of cells belonging to areolar connective tissues. It fills the space around the organs. 
    Kupffer cells are star-shaped macrophages present in the liver lining. 
    Nerve cells possess a cell body and one or many thin fiber-like axons. Some nerve cells possess axons as long as 1 meter and thus, are the largest cell in the human body. It is also known as the longest cell in the human body. Thus, the correct answer is option A.

    The ostrich egg is the largest cell known.

    biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

    1. True

    2. False

    Show answer
    Correct Option: A
    Explanation:

    The ostrich egg is the largest cell known. These eggs are 15 cm long and 13 cm wide.