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Biomolecules Quiz-08

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NEET is the most famous and important medical entrance examination held in our country. This exam is an objective type, an offline test which includes 4 sections namely– Physics, Chemistry, Botany, and Zoology. The maximum marks that can be scored are 720 marks and have 180 questions. About half of the paper consists of questions from Biology, as the NEET exam essentially focuses on capacitating students to go for seats in medical courses. One of the most significant and crucial sections in the NEET exam is of Biology. It comprises of theories, descriptions, discoveries, diagrams, definitions, explanations of differences, and relations. The majority of the topics covered in the NEET syllabus are from the NCERT syllabus of Class 11 & 12 and other related sources become part of the rest of the syllabus. Clear Exam curates a list of articles selected by professionals who recommend the highly vital topics for NEET exams. The table below takes you directly to the respective topic where the in-depth article and the MCQs are available for an easy and productive learning experience. Prior to solving NEET question papers or practicing mock tests, you must ensure to study the basic concepts in NEET and practice a few sample questions related to this exam. Students will be covered for all their studies as the topics are available from basics to even the most advanced. .

Q1.   The fastest acting enzyme, in the biological kingdom, is
  •  Lipase
  •  Amylase
  •  Peptidase
  •  Carbonic anhydrase
Solution
(d) Carbonic anhydrase is found in red blood cells. This is the fastest acting enzyme and helps in the formation as well as decomposition of carbonic acid to carry carbon dioxide.

Q2.   Silk consists of
  •  Central core of sericin
  •  Central core of fibroin
  •  Both (a) and (b)
  •  A fine mixture of fibroin and sericin
Solution
(b) The central core of silk fibre is made up of fibroin protein. Silk fibres are soft and flexible. These are composed of β-pleated sheets.

Q3.   Choose the element which is negligible in living matter
  •  Si
  •  Mg
  •  Ca
  •  S
Solution
(a) Silicon is almost negligible in living organism. A comparison of elements present in non-living and living matter is as follows *Adapted from CNR Rao, Understanding Chemistry Universities Press Hyderabad

Q4.   Which disaccharide has different linkage?
  •  Maltose
  •  Starch
  •  Sucrose
  •  Lactose
Solution
(c) Sucrose has different linkage. It consists of 1, D-glucose and 1, D-fructose units jointed by α-1,2-glycosidic linkage.

Q5.   Fluidity of bio-membranes can be shown by
  •  Electron microscope
  •  Tissue culture
  •  Phase-contrast microscope
  •  Fluorescence microscope
Solution
  (d) In fluorescence microscopy, the object is stained with a fluorescent substance and when stained cell or all parts are observed through ordinary microscope using UV light, appear as luminous objects. This technique is helpful to show the fluidity of biomembranes.

Q6.   For nucleic acids, the building block is a
  •  Nucleotide
  •  Nucleoside
  •  Polynucleotide
  •  Sugar
Solution
(a) For nucleic acids, the building block is a nucleotide. A nucleotide has three chemically distinct components. One is a heterocyclic compound, second is a monosaccnaride and the third a phosphoric acid or phosphate

Q7.   Which of the following statements are incorrect? I. Left end of a polysaccharide is called non-reducing end while right end is called reducing end II. Starch and glycogen are branched molecules III. Starch and glycogen are the reserve food materials of plants and animals, respectively IV. Starch can hold iodine molecules in its helical secondary structure but cellulose being non-helical, cannot hold iodine
  •  Statements I and II are incorrect
  •  All statement are incorrect
  •  Only statement IV is incorrect
  •  None of these
Solution
(d) All statements are correct

Q8.   Carbohydrates, the most abundant biomolecules earth, are produced by
  •  All bacteria, fungi and algae
  •  Fungi, algae and green plant cells
  •  Some bacteria, algae and green plant cells
  •  Viruses, fungi and bacteria
Solution
(c) Carbohydrates are the products of photosynthesis, which is carried out by photosynthetic bacteria, green algae and green plant cells.

Q9.   Which is a reducing sugar?
  •  Galactose
  •  Gluconic acid
  •  β- methyl galactoside
  •  Sucrose
Solution
(a) Glucose, fructose, mannose and galactose are hexose monosaccharides. The monosaccharides have free aldehyde or ketone group, which can reduce 〖Cu^2〗^+to Cu. Therefore, these are called reducing sugars.

Q10.   Identify X and Y in the given protein structure


  •  X-N-terminal amino acid, Y-C-terminal amino acid
  •  X-N-terminal amino acid, Y-N-terminal amino acid
  •  X-C-terminal amino acid, Y-N-terminal amino acid
  •  X-C-terminal amino acid, Y-C-terminal amino acid
Solution
(a) 


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