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Cell The Unit of Life Test - 50

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Cell The Unit of Life Test - 50
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Weekly Quiz Competition
  • Question 1
    1 / -0
    The endoplasmic reticulum produces protein and are secreted from the cell by
    Solution
    The rough endoplasmic reticulum (RER) is the site for protein synthesis with the help of the ribosomes. The Golgi apparatus links carbohydrates with proteins coming from ER to form glycoproteins by the process of glycosylation. The Golgi complex modifies, sorts and packages proteins and lipids coming from the ER. Packaging involves formation of secretory vesicles which pinch off from the ends of the cisternae and release their secretions by exocytosis.
    Thus, the correct answer is option 'Exocytosis'.
  • Question 2
    1 / -0
    Which of the following organism has single point of origin of replication in  chromosome?
    Solution
    Prokaryotic chromosomes have less sequence-based structure than eukaryotes. Bacteria typically have a single point from which replication starts, whereas some archaea contain multiple replication origins. Eukaryotes including fungi have multiple origins of replication.
    Therefore, the correct answer is option D.
  • Question 3
    1 / -0
    Which one of the following human cells are without mitochondria?
    Solution
    RBC's are also called erythrocytes. They neither possess nucleus nor other organelles like mitochondria, golgi apparatus and endoplasmic reticulum. Since, they donot posses mitochondria, these cells use none of the oxygen they transport instead, they produce the energy carrier ATP from cycles like Krebs cycle and electron transport system.
    Therefore, the correct answer is option B.
  • Question 4
    1 / -0
    Which of the cell organelle lacks membrane?
    Solution
    The smallest cell organelle without cell membrane is ribosome. When ribosome produces protein, it gets bound to membrane bound endoplasmic reticulum by transcolon. Ribosomes synthesizes proteins which helps in growth and development of the body.
  • Question 5
    1 / -0
    The organelles that are present in eukaryotes but not in prokaryotes is/are: 
    Solution
    • Prokaryotes are unicellular organisms that lack membrane-bound cell organelles. Nucleus and mitochondria are double membrane-bound organelles and hence, are absent in prokaryotic cells.
    • Ribosomes are organelles made up of proteins and RNA molecules called subunits and do not have any membrane. These are involved in protein synthesis and are present in both prokaryotes (70S type) and eukaryotes (80S type). 
    Therefore, the correct answer is option D.
  • Question 6
    1 / -0
    Name the cell structures which are bounded by a membrane.
    I- Lysosomes
    II- Endoplasmic reticulum
    III- Centrosome
    IV- Mitochondria
    Solution
    The mitochondrion is double membrane bound organelle, wherein the inner membrane is present as infolding and forms cristae.
    Lysosomes, present in the cytoplasm, are the single membrane bound suicidal bags of cell.
    Endoplasmic reticulum, consists of an interconnected network of membranous tubules.
    Centrosome is the region, near nucleus that serves as microtubule organizing center and hence is not a membrane bound structure. 
    Therefore, the correct answer is option D.
  • Question 7
    1 / -0
    What is the function of lysosome?
    Solution
    • Lysosomes are single membrane-bound small vesicles containing hydrolyzing enzymes. 
    • Lysosomes are rich in a variety of hydrolytic enzymes. They are responsible for the digestion of foreign particles, cell debris, and dead or weak cellular component. 
    • It cleans the cell by digesting unwanted debris or damaged organelles inside the cell. 

    Thus, the correct answer is option 'Digestion of intracellular debris'. 
  • Question 8
    1 / -0
    What is true about the growth pattern of plate I?

    Solution
    The extent of  growth of bacteria, on a nutrient agar media, depends on upon several conditions like pH, temperature etc. The conditions of growth are specific for a particular strain of bacteria.
    Here, in the plate I bacteria 2 inhibits the growth of any other bacteria in the nearby region because it produces an antibiotic which, inhibits the growth. Bacteria 4 is susceptible to the antibiotics produced by bacteria 2 and it has  prolonged exponential phase so it overpowers the growth of bacteria 1 and 2.
  • Question 9
    1 / -0
    This organelle is made up of RNA and proteins and is also responsible for translation of mRNA during polypeptide synthesis __________.
    Solution
    Ribosomes are very small macromolecular complexes, composed of rRNA and proteins, and are responsible for protein synthesis (translation) on mRNA templates. Each ribosome is composed of a large and a small subunit.
    So, option C is correct. 
  • Question 10
    1 / -0
    The chloroplast and mitochondria are likely to have evolved from engulfed prokaryotes that once lived as an independent organisms.The supporting evidence for this is that they both
    I. Possess capability to synthesize their own proteins.
    ll. Possess genetic material.
    lll. Possess a lipid bilayer membrane.
    lV. Possess characteristic ribosomes.

    Solution
    Bot mitochondria and chloroplast are surrounded by lipid bilayer membrane. They possess its own self-replicating DNA and 70S ribosomes for proteins synthesis. Thus, it is believed that mitochondria and chloroplast have evolved from the prokaryotic cells. Thus, the correct answer is option E.
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