quiz18 bio molecules

bio molecules Quiz-18

Dear Readers,

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.  Sucrose, a common table sugar is composed of

•   Glucose and fructose
•   Glucose and galactose
•   Fructose and galactose
•   None of the above

Solution
(a) Sucrose is a non-reducing sugar. It consists of one glucose and one fructose moiety, and is the main transporting sugar in plants.

Q2. Which of the following statements are correct? I. Acetic acid can form cholesterol II. Flow of metabolites through metabolic pathway has a definite rate and direction. It is called dynamic state of body constituents III. Anabolic pathway is endergonic while catabolic pathway is exergonic IV. All biomolecules have a term over, they are constantly being changed into some other biomolecules and also made from other biomolecules The correct options is

•   All are correct
•   I and II are correct
•   Only IV is correct
•   All are wrong

Solution
(a) All are correct

Q3.   What are proenzymes?

•   Inactive form of enzymes
•   Active form of enzymes
•   Neutral form of enzymes
•   None of these

Solution
(a) Inactive form of enzymes is called proenzymes

Q4.  The substance, which is metal ion essential for the normal functioning of enzyme is called

•   Cofactor
•   Coenzyme
•   Holoenzyme
•   None of these

Solution
(a) Cofactor is a non-protein component essential for the normal catalytic activity of an enzyme. Cofactors may be organic molecule or inorganic ions.

Q5. Proteins with catalytic power are called

•  Reactants
•   Substrate
•   Co-factors
•   Enzymes

Solution
  (d) The catalysts which hasten the rate of a given metabolic conversation are also proteins. These proteins with catalytic power are named enzymes

Q6. A nucleotide has three chemically distinct compounds. These are A, B and C Choose the correct option for A, B and C

•   A-Sugar, B-carbonates, C-chlorides
•   A-DNA, B-cellulose, C-chitin
• A-Heterocyclic compound, B-Monosaccharide, C-a phosphate
•   A-Phosphoric acid, B-Proteins, C-acids

Solution
(c) A nucleotide has three components. One is a heterocyclic compounds, second is a monosaccharide and third is a phosphate or phosphoric acid

Q7. In a polysaccharide, the individual monosaccharides are linked by a

•   Glycosidic bond
•   Peptide bond
•   Ester bond
•  Phosphodiester bond

Solution
(a) Polysaccharides are large sized carbohydrates which are formed by condensation of a number of monosaccharides. These are also called glycan because of their formation from sugars. Linkage between adjacent monosaccharides is through glycosidic bonds . A molecules of water is released at each point of condensation.

Q8. Molecular weight of protein is

•   >12000
•   >6000
•  <12000<12000 span="">
•   600-3000

Solution
(b) Proteins are linear polymers of amino acids. Hence, these are made up of C, H, O, N and in some cases S also. These are macromolecules of high molecular weight (from 6000 to several millions). The elimination of water during interaction between the amino acids is called condensation and the linkage so formed is a carbon nitrogen bond called peptide bond. The compound so formed is called dipeptide.

Q9. Which of the following statement(s) are/is correct? I. In the process of metabolism, all organic biomolecules are constantly being broken down but not being built up through chemical reactions II. A product of metabolism in called a metabolite, but not always III. Metabolism is always known to built up new products IV. Metabolism is the characteristic feature of non-living things

•   All are incorrect
•   All are correct
•   Only IV is correct
•   II and IV are correct

Solution
(a) All statements are incorrect. Metabolism is features of living beings. During the process of metabolism, the organic molecules are being broken down and build up through the series of chemical reactions. The new product produced during the metabolism are termed as metabolism are termed as metabolite

Q10.  Almost all enzymes are … in nature

•   Lipids
•   Proteins
•   Carbohydrates
• Nucleic Acid

Solution
(b) Almost all enzymes are proteinaceous in nature