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Cell Biology Test - 9

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Cell Biology Test - 9
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  • Question 1
    1 / -0

    A number of different materials may be deposited in the cell wall. Which of the following reduces the water content of the wall matrix and increases its hardness?

    Solution

    This is the correct option. Lignin reduces the water content of the wall matrix and increases its hardness.

  • Question 2
    1 / -0
    Passage of substances across biomembranes occurs by passive, active and bulk transport. Which of the following statements about passive transport is true?
    Solution

    Option 2 gives the true statement about passive transport. The cells do not spend energy in passive transport. Passive transport is always along the concentration or electrochemical gradient. Active transport usually occurs against concentration gradient. It does not allow accumulation of substances in the cell. Metabolic inhibitors do not influence passive transport. Metabolic inhibitors stop active transport.

  • Question 3
    1 / -0

    Which of the following forms of endoplasmic recticulum is/are flat, interconnected sac-like parts which are 40-50 nm in diameter and occur in the cells actively involved in synthetic activity?

    a. Cisternae
    b. Vesicles
    c. Tubules

    Solution

    Endoplasmic reticulum is an extensive membrane network of cisternae (sac-like structures), which are held together by the cytoskeleton. Cisternae are flat, interconnected sac-like parts which are 40-50 nm in diameter and occur in the cells actively involved in synthetic activity. They are tubular in structure, and form a three-dimensional polygonal network. They are about 50 nm in diameter in mammals and 30 nm in diameter in yeast.

  • Question 4
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    Depending upon morphology and function, there are four types of lysosomes. Which of the following types of lysosomes is formed by the fusion of food containing phagosome with lysosome?
    Solution

    This is the correct option. Secondary lysosome is formed by the fusion of food containing phagosome with lysosome. As the digestion occurs, the digested food is passed out into the cytoplasm and the secondary lysosome is left with undigested food.

  • Question 5
    1 / -0

    This is the correct option. Secondary lysosome is formed by the fusion of food containing phagosome with lysosome. As the digestion occurs, the digested food is passed out into the cytoplasm and the secondary lysosome is left with undigested food.

    Solution

    This is the correct option. Food vacuoles occur in the cells of protozoan protists, several lower animals and phagocytes of higher animals.

  • Question 6
    1 / -0

    Consider the following statements and answer accordingly:

    a. In a mitochondrion, outer chamber is the space that lies between the outer and the inner membranes of the mitochondrial envelope.
    b. Mitochondria synthesise some of their own structural proteins.

    Solution

    This is the correct option as both the statements are true.

  • Question 7
    1 / -0

    Depending upon their colour, plastids are of three main types. Which of the following are colourless plastids that generally occur near the nucleus of non-green cells and possess internal lamellae?

    a. Leucoplasts
    b. Chromoplasts
    c. Chloroplasts

    Solution

    Leucoplasts are colourless plastids that generally occur near the nucleus of non-green cells and possess internal lamellae.

  • Question 8
    1 / -0

    A cell contains a number of organelles with similarities and dissimilarities. Which of the following is a similarity between mitochondria and chloroplasts?

    Solution

    This is the correct option as this is a similarity between mitochondria and chloroplasts. Both mitochondria and chloroplasts can form fatty acids and amino acids.

  • Question 9
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    Consider the following statements and answer accordingly:

    a. The protistan Paramecium caudatum has two nuclei, macronucleus for controlling metabolic activities of organism and micronucleus possessing hereditary information.
    b. Nucleus is suspended in central vacuole by cytoplasmic strands in Spirogyra.

    Solution

    Both the statements are true. The protistan Paramecium caudatum has two nuclei, macronucleus for controlling metabolic activities of organism and micronucleus possessing hereditary information. Nucleus is suspended in central vacuole by cytoplasmic strands in Spirogyra.

  • Question 10
    1 / -0

    Which of the following is the hair-like projecting part of flagellum or cilium, the length of which is 5-20 μm in case of cilium and 100-200 μm in case of flagellum?

    Solution

    This is the correct option. Shaft is the hair-like projecting part of flagellum or cilium, the length of which is 5-20 μm in case of cilium and 100-200 μm in case of flagellum.

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