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Cell The Unit of Life Test - 26

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Cell The Unit of Life Test - 26
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  • Question 1
    1 / -0
    The 70S type of ribosome shows two units whose sedimentation constants are
    Solution
    A prokaryotic ribosome (70S) is made up of two subunits 50S and 30S, while an eukaryotic ribosome (80S) is made up of two subunits 60S and 40S.
  • Question 2
    1 / -0
    Who showed that the nuclear membrane has many pores or circular structures or annuli?
    Solution
    The nucleus is surrounded by a double membrane bearing many pores. These pores are important for cytoplasm-nucleoplasm communication and exchange of materials. Nuclear pores have diaphragms, septa annuli, microspores for movement of substances between nucleus and cytoplasm. The nuclear pore complex was first described by Callan and Tomlin.
  • Question 3
    1 / -0
    In a eukaryotic cell, the nucleus has:
    Solution
    In a eukaryotic cell. the nucleus is a defined central region. It is enveloped by a nuclear membrane which is made up of two layers. This membrane has a large number of pores (having a diameter of 200-800 angstroms). The pores facilitate the movement of substances between nucleus and cytoplasm.
    Hence, the correct option is D.
  • Question 4
    1 / -0
    Ribosomes are attached to Endoplasmic reticulum
    Solution
    In eukaryotes, rough endoplasmic reticulum (RER) bear ribosomes on their surface. The attachment between ribosomes and endoplasmic reticulum is through a hydrophobic signal recognition particle or SRP linked to 60S subunit of ribosome and SRP receptor or ribophorin present over the ER.
  • Question 5
    1 / -0
    Nucleolemma is a part of
    Solution
    Nucleo-lemma is a term used in parallel with plasma-lemma. The nucleo-lemma is a part of the nuclear membrane. The outer membrane may have ribosomes and interconnections with ER. Nuclear membrane has a large number of pores for the nucleo-cytoplasmic exchange of materials.
    Hence the correct option is A.
  • Question 6
    1 / -0
    One of the following serves as a temporary storage place for proteins and other compounds synthesized by endoplasmic reticulum _____________.

    Solution
    Dictyosomes are net-like flat, membrane bound cavity structures called cisternae which comprise the Golgi apparatus.  Proteins are stored in the dictyosomes for further transport,modified,sorted and packed into vesicles. Golgi complexes are compressed stacks of membrane bound pouches. This are mainly present in the plant cells. The Golgi apparatus appears here as a short structure type vesicles which are known as the dictyosomes. The proteins are synthesized in rough endoplasmic reticulum and are temporary store here alongwith some other compounds.
    So, the correct option is (D).
  • Question 7
    1 / -0
    The structure of the chromosome to which spindle

    fibre is attached is
    Solution
    The centromere is the part of a chromosome where the sister chromatids are linked together during the cell division. In mitosis, spindle fibres attach to the centromere via the kinetochore. Centromeres were first defined as genetic loci that direct the behaviour of chromosomes.
    Hence C is the correct option. 
  • Question 8
    1 / -0
    Active transport involves transport of ions
    Solution
    Active transport is the movement of a substance against its concentration gradient i.e., from a region of low concentration to high concentration. As the transport is against the concentration gradient, ATP or adenosine triphosphate is required to facilitate this transport. So, the correct answer is option A.
  • Question 9
    1 / -0
    Which statement is incorrect for ion-channels?
    Solution
    • Ion channels are special proteins through which ions flow along the concentration gradient. These channels are important because the membrane is made up of a bilayer of lipids and will not allow the transport of water-soluble ions. 
    • However, lipid-soluble components can dissolve in membrane lipids and can be transported across the membrane without special carrier or transport proteins.
    • But all ions cannot pass through the same transport protein because the volume of each ion will be different. There are different transport proteins for the transport of different ions.

    So, the correct answer is option D.
  • Question 10
    1 / -0
    Flagella of prokaryotic and eukaryotic cells differ in ________________.
    Solution
    Flagella of prokaryotic and eukaryotic species differ in microtubular organizations and type of movement in eukaryotes, the tubular arrangement is (9+2) and specialized while in prokaryotes the microtubular arrangement is (9+0) and is simple, hence movement is also different, prokaryotes have rotatory movement and eukaryotes have bending movement. Thus, the correct answer is option A.
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