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Biology Test 21

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Biology Test 21
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Weekly Quiz Competition
  • Question 1
    4 / -1

    Each peripheral fibril on the centriole is made up of

    Solution

    In Centriole, each triplet fibril consists of three microtubules or sub-fibres designated from inside to outside as A, B and C. The three microtubules are joined in such that A sub-fiber is a complete microtubule having 13 protofilaments while B & C sub-fibers are incomplete and share 2-3 protofilaments with A sub-fiber.

     

  • Question 2
    4 / -1

    Pattern of organisation of cilia and flagella is

    Solution

    Pattern of organisation of cilia and flagella is 9 + 2 i.e. 9 in periphery and 2 in centre.

     

  • Question 3
    4 / -1

    The sphaerosomes are rich in

    Solution

    Sphaerosomes are small membrane bound organelles which take part in storage and synthesis of fats. They contain granular contents, rich in lipids but also have some proteins.

     

  • Question 4
    4 / -1

    Urate oxidase occurs in

    Solution

    The enzyme urate oxidase or uricase catalyzes the oxidation of uric acid to 5-hydroxyisourate. Urate oxidase is mainly localized in the liver, where it forms a large electron-dense paracrystalline core in many peroxisomes.

     

  • Question 5
    4 / -1

    The tonoplast is

    Solution

    The tonoplast is a membrane separating a vacuole from the surrounding cytoplasm in a plant cell. It is differentially permeable in nature.

     

  • Question 6
    4 / -1

    Sphaerosomes have affinity for

    Solution

    Sphaerosoms are highly refractile and rich in fat (98%) and take black stain with sudan III/Osmium tetraoxide.

     

  • Question 7
    4 / -1

    Which of the following subunit of ribosome is composed of 23S rRNA and a 5S rRNA + 32 different proteins

    Solution

    50 S subunit of ribosome is composed of 23S rRNA and a 5S rRNA + 32 different proteins.

     

  • Question 8
    4 / -1

    Cell organelle known as “protein factory of the cell” is

    Solution

    Ribosomes are called site of protein synthesis because tow sub‑units of ribosomes are attached with the thread of mRNA. This mRNA contains anticodes for protein synthesis.

     

  • Question 9
    4 / -1

    70S type of ribosome shows two units whose sedimentation constants are

    Solution

    70S types of ribosome are found in prokaryotic cells. They are made up of two units, 50 S (large unit) and 30 S (small unit).

     

  • Question 10
    4 / -1

    The division of the plant kingdom into prokaryota and Eukaryota is based on the characters of

    Solution

    The division of the plant kingdom into prokaryota and Eukaryota is based on the various characters like presence of nucleus, chromosomes, cell organelles etc.

     

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