Tag: cell-the basic unit of life

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

The smallest human cell is

  1. Erythrocyte

  2. Kidney cell

  3. Liver cell

  4. Sperm
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

    Longest cell in human body may be_____________.

    1. Nerve cell

    2. Leg muscle cell

    3. Bone cell

    4. Heart muscle cell
    Reveal answer Fill a bubble to check yourself
    A Correct answer
    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. 

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

    Dendrites are a part of 

    1. Grey matter

    2. White matter

    3. Dura mater

    4. Arachnoid mater
    Reveal answer Fill a bubble to check yourself
    A Correct answer
    Explanation

    Dendrites are the branched projections of a neuron that receive signals. They are located in the grey matter of the central nervous system, which consists primarily of neuronal cell bodies and dendrites.

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

    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.

    1. i, iii, ii, iv, v

    2. ii, i, iii, iv, v

    3. i, iii, ii, v, iv

    4. ii, iii, i, iv, v
    Reveal answer Fill a bubble to check yourself
    C Correct answer
    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.

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

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

    1. White blood cells

    2. Red blood cells

    3. Columnar epithelial cells

    4. Nerve cells

    5. Mesophyll cells
    Reveal answer Fill a bubble to check yourself
    B Correct answer
    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.
    Multiple choice biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

    The longest cell in the human body is

    1. Nerve cell

    2. Muscle cell

    3. Liver cell

    4. Kidney cell
    Reveal answer Fill a bubble to check yourself
    A Correct answer
    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.
    Multiple choice biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

    Which one is smallest cell?

    1. Bacteria

    2. Parenchyma

    3. PPLO

    4. Virus
    Reveal answer Fill a bubble to check yourself
    C Correct answer
    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.

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

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

    1. Nerve cells

    2. Epithelial cell

    3. Mast cell

    4. Kupffer cell
    Reveal answer Fill a bubble to check yourself
    A Correct answer
    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.