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Bio molecules Quiz-20

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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.  Biomolecules are constantly being changed into some other biomolecules and are made from ….
  • 10º 
  •  15º
  •  20º
  •  27º
Solution
The rate of reaction doubles are decreases by half for every 10 change in either direction

Q2. Biomolecules are constantly being changed into some other biomolecules and are made from ….
  •   Amino acids
  •   Biomolecules only
  •   Monosaccharides
  •   Enzymes
Solution
(b) Biomolecules only

Q3.   Name the four elements called ‘Big-four’ which make up 95% of all elements found in a living system
  •   C, H, O, P
  •   C, H, O, N
  •   C, N, O, K
  •   C, H, O, S
Solution
(b) The four main elements found in a living system which make 95% of all elements are Carbon – 18.5% Hydrogen – 0.5% Oxygen – 65% Nitrogen – 3.3% These four elements are called ‘Big-four’ elements

Q4.  The inhibitor which inhibits the enzyme activity by binding to the active site of the enzyme, due to the close resemblance to the substrate in its molecular structure is called
  •   Non-competitive inhibitor
  •   Competitive inhibitor
  •   Allosteric modulator
  •   Feedback inhibitor
Solution
(b) When the inhibitor closely resembles the substrate in its molecular structure and inhibits the activity of the enzyme, it is known as competitive inhibitor

Q5. Those nucleic acids which behave like enzymes are known as
  •   Ribozymes
  •   Pepzymes
  •   Both (a) and (b)
  •   Ribose
Solution
  (a) Ribozymes are RNA molecules that are capable of performing specific biochemical reactions. They play very important role is therapeutic agents

Q6.  Which of the two groups of following formula is involved in peptide bond formation between different amino acids?
  •   1 and 3
  •   2 and 3
  • 2 and 4
  •   1 and 4
Solution
(a) Amino acids have a central four valence carbon atom, called the alpha carbon to which are attached (i) an amino group on one side, (ii) a carboxyl groups on the other side, (iii) a hydrogen atom (H) on the third side and (iv) a variable group symbolised by on the fourth side. Out of them, and COOH are involved in peptide bond formation

Q7.Which one is imino acid?
  •   Pepsin
  •   Proline
  •   Cysteine
  •   Rennin
Solution
(b) There are 20 different amino acids. In proline and hydroxyl proline instead of group, NH group is present. These are called imino acids. Methionine and cysteine are sulphur containing amino acids.

Q8. The tertiary structure of the proteins containing amino acid cysteine is achieved through
  •   Hydrogen bonds
  •   Disulphide bonds
  •   Van der Waal’s force
  •   Ionic bonds
Solution
(b) The shape of a protein in its functional mode is its teritiary structure, determined largely by primary structure, positively charged regions attract and bind to negatively charged regions and hydrophobic R groups interact and form water-free pockets inside the folded protein. Cysteines may link to protein, together with disulphide bonds.

Q9. The curve given below shows enzymatic activity with relation to three conditions (pH, temperature and substrate concentration) What do the two axes (X and Y) represent?
  •   Temperature Enzyme activity
  •   Substrate concentration Enzymatic activity
  •  Enzymatic activity Temperature
  •   Enzymatic activity pH
Solution
(a) X-axis represents temperature while Y-axis represent enzyme activity. All enzymes act at an optimum temperature, above and below this temperature, the enzyme activity declines.

Q10.  Chemical compounds which are found in the acid insoluble fraction are called
  •   Biomolecules
  •   Macromolecules
  •   Micromolecules
  • Both (a) and (b)
Solution
(b) Chemical compounds, which are found in the acid insoluble fraction are called biomacromolecules or macromolecules

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