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Cell The Unit of Life Test - 49

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Cell The Unit of Life Test - 49
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  • Question 1
    1 / -0
    Animal cells do not have:
    Solution
    Animal cells do not have a cell wall. Animal cells do not have chloroplasts. The plastid is a major double-membrane organelle found, among others in the cells of plants and algae. These plastids are not present in animal cells.
    Hence the correct option is D.
  • Question 2
    1 / -0
    The endoplasmic reticulum remains in continuation with
    Solution
    Endoplasmic reticulum (ER) is in continuation with the outer nuclear membrane. Therefore, when a cell makes proteins, it starts by transcribing mRNA from the DNA located inside its nucleus. mRNA that is made is then carried out of the nucleus into the rough endoplasmic reticulum. There, the mRNA binds with a ribosome attached to the ER and makes polypeptides, which then fold into the proper shapes to make proteins.
    So, the correct answer is option B.
  • Question 3
    1 / -0
    What is genophore?
    Solution
    Genophore refers to chromosome equivalent in prokaryotes, viruses and semi autonomous organelles that serves as heredity material. It consists of nucleic acids, DNA or RNA but lack any histone proteins. This makes option B correct answer. 
    Option C is incorrect as genophores lack proteins. 
    Option A and B are incorrect as genophore can have any of nucleic acid, be it DNA or RNA. 
    Therefore, the correct answer is option B.
  • Question 4
    1 / -0
    Which of the following is the secretory organelle of the cell ?
    Solution
    Golgi apparatus is often regarded as the secretary organelle of the cell.This is because it helps in transporting protein within or outside the cell.It can either be transported from inside to outside or within the cell region.It is mainly used for the transportation of protein outside the cell. Thus, Golgi apparatus is the secretory organelle of cell.


  • Question 5
    1 / -0
    The nucleus is separated from cytoplasm by
    Solution
    In the eukaryotic cell, the nucleus is separated from the cytoplasm by a double lipid bilayer membrane known as a nuclear membrane. It encloses the genetic material of a cell. It is also known as karyotheca.
    Hence the correct option is D.
  • Question 6
    1 / -0
    Which organelle transports proteins to golgi apparatus?
    Solution
    ER is a sac-like structure found in the cytoplasm. There are two types of endoplasmic reticulum - rough ER that has ribosomes attached to it, and smooth ER, which does not have ribosomes. The endoplasmic reticulum plays an important role in the transportation of proteins to the Golgi apparatus. It also facilitates the synthesis of protein and steroids, as well as the production and storage of glycogen. 
    So, the correct answer is 'Endoplasmic reticulum'.
  • Question 7
    1 / -0
    Choose the incorrect pair from the following.
    Solution
    Nucleus contain DNA and chromosomes, but in also contains other components. For example, the nucleus contains the nucleolus, a mess of strands of nucleic acid. Also, the nucleus contains RNA, which convey the DNA's messages to the cell. 
    Option B is the incorrect pair as protein synthesis takes place in the endoplasmic reticulum.
    Respiration is a process that needs energy and since the source of energy is the mitochondria, it occurs in the mitochondria. 
    The cytoskeleton of eukaryotes (including human and all animals cells) has three major components: microfilaments composed of the protein actin and microtubules composed of the protein tubulin are present in all prokaryotic cells.
    Therefore, the correct answer is option B.
  • Question 8
    1 / -0
    Which of the following combinations are present in plant cell but not in animal cell?
    Solution
    Plant and animal cells are both eukaryotic cell but have several differences-  animal cells are round and do not have a cell wall and plastids but plant cells are rectangular and possess cell wall and plastids.
    Cell membrane and cytoplasm are seen in both plant and animal cells.
    Hence the correct option is A.

  • Question 9
    1 / -0
    Enzymes of lysosomes are synthesized in _____________.
    Solution
    Lysosomal enzymes are made in the rough endoplasmic reticulum and travel to the Golgi. This is added by the sequential action of two Golgi enzymes, a phosphotransferase and a diesterase, and it is the addition of the mannose 6 phosphate that identifies the protein as destined for the lysosome. 
    So, option C is correct. 
  • Question 10
    1 / -0
    The cellular respiration in prokaryotes takes place in
    Solution
    Option A is incorrect as prokaryotes lacks any membrane bound organelles. 
    In absence of mitochondria, cytoplasm or surface of plasma membrane serves as the site for cellular respiration which makes option B correct. 
    Options C, D and E are biomolecules. 
    Therefore, the correct answer is option B.
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