Biomolecules Quiz-03

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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.   Malonate inhibits succinate dehydrogenase, is an example of
  •  Allosteric inhibition
  •  Negative feedback
  •  Competitive inhibition
  •  Non-competitive inhibition
(c) Malonate inhibits succinate dehydrogenase is an example of competitive inhibition, which closely resembles the substrate succinate in structure. Such competitive inhibitors are often used in the control of bacterial pathogens

Q2.   Histone octamer contains
  •  Eight types of histones
  •  Eight histones of four different types
  •  Five histones
  •  Six types of histones
(b) Histones are a set of positively-charged, basic proteins. Histones are rich in the basic amino acid residuesl lysines and arginines. Both the amino acid residues carry positive charges in their side chains. Two molecules of each of the four types of histones – H_2 A,H_2 B,H_3 and H_4 are organized to form histone octamers. These form the inner core of nucleosome. The negatively charged DNA is wrapped around the positively – charged histone octamer to form a structure called nucleosome.

Q3.   Which of the following statements regarding enzyme inhibition is correct?
  •  Non-competitive inhibition of an enzyme can be overcome by adding large amount of substrate
  •  Competitive inhibition is seen when a substrate competes with an enzyme for binding to an inhibition protein
  •  Competitive inhibition is seen when the substrate and the inhibitor compete
  •  Non-competitive inhibitors often bind to the enzyme irreversibly
(c) Competitive inhibition is seen, when the substrate and the inhibitor compete for active site.
Q4.   Amino acids are organic compounds and are called α-amino acids. Why?
  •  Amino acids are organic compounds containing an amino group and acidic group as substituents n two different carbons
  •  Amino acids are organic compounds containing an amino group and an acidic group as substituents on the same carbon
  •  Amino acids are inorganic compounds containing an amino group and acidic group as substituents on two different carbons
  •  Amino acids are inorganic compounds containing an amino group and acidic group as substituents on the same carbon
(b) Amino acids are organic amino acids containing an amino group and an acidic group pas substituents on the same carbon, i.e., the α-carbon. Hence, they are called α-amino acids

Q5.   Enzymes that catalyses the removal of groups from substrates by mechanism other than hydrolysis, addition of groups to double bonds are called
  •  Lyases
  •  Ligases
  •  Hydrolases
  •  Dehydrogenases
  (a) Lyases catalyse the breakage of specific covalent bonds and removal of groups without hydrolysis. Example histidine decarboxylase splits C-C bonds of histidine forming CO_2 and histamine

Q6.   Allosteric modulation is due to inhibition action of enzyme by
  •  Competitive inhibition
  •  Substrate concentration
  •  Products of reaction
  •  Enzyme concentration
(c) Enzyme inhibition caused by a product of enzyme catalyzed reaction is allosteric modulation or feedback inhibition. Thus, products of reaction inhibits the enzyme action, e.g., glucose-6-phosphate, the end product in glycolysis, can inhibit hexokinase activity.

Q7.   Given below is the chemical formula of

  •  Palmitic acid
  •  Stearic acid
  •  Glycerol
  •  Galactose
(a) CH_3 (CH_2 )_14 COOH is the chemical formula of palmitic acid. It is a saturated fatty acid.

Q8.   Cholesterol is considered as a crucial molecule in animals because it is
  •  Necessary for survival
  •  Energy source
  •  Helps in hydrolysis of glycogen
  •  Source of many vertebrate hormones and other steroids
(d) Cholesterol is considered as a crucial molecule in animals because it is the source of many vertebrate hormones and other steroids

Q9.   Select the correct pair of substituted purines
  •  Cytosine and thymine
  •  Adenine and guanine
  •  Uracil and cytosine
  •  Guanine and uracil
(b) Adenine and guanine are substituted purines, while the rest (uracil, cytosine and thymine) are substituted pyrimidines

Q10.   Which of the following is an essential amino acids?
  •  Valine
  •  Leucine
  •  Tryptophan
  •  All of these
(d) Seven amino acids are the essential amino acids for man. They include leucine, isoleucine, lysine, methionine, phenylalanine, tryptophan and valine

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Biomolecules Quiz-03
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