Quiz-11
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.
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Q1. In animal tissues, the categories of compounds present are called
Solution
In animal tissues, the categories of compounds present are called primary metabolites
In animal tissues, the categories of compounds present are called primary metabolites
Q2. Enzyme often have additional parts in their structures that are made up of molecules other than proteins. When this additional chemical part is an organic molecule, it is called
Solution
Special non-protein molecules are called cofactors. These help enzymes to catalyze chemical reactions. Organic cofactors are called coenzymes.
Special non-protein molecules are called cofactors. These help enzymes to catalyze chemical reactions. Organic cofactors are called coenzymes.
Q3. If the total amount of adenine and thymine in a double-stranded DNA is 60%, then the amount of guanine in this DNA will be
Solution
Purine and pyrimidine nitrogenous base are found in DNA. Among purines, adenine pairs only with the pyrimidine thymine. Similarly, guanine pairs with the cytosine. The fact that total amount of purine will be equal to total amount of pyrimidine was first enunciated by Chargaff in 1950. From this law, Adenine=Thymine=60/2=30% Guanine=Cytosine=40/2=20%
Purine and pyrimidine nitrogenous base are found in DNA. Among purines, adenine pairs only with the pyrimidine thymine. Similarly, guanine pairs with the cytosine. The fact that total amount of purine will be equal to total amount of pyrimidine was first enunciated by Chargaff in 1950. From this law, Adenine=Thymine=60/2=30% Guanine=Cytosine=40/2=20%
Q4. The form of DNA with pitch with a rise per base pair of is called
Solution
Each strand appears like a helical staircase. Each step of ascent is represented by a pair of bases. At each step of ascent, the strand turns the pitch would be . The rise per base pair would be . this form of DNA with the above mentioned salient features is called B-DNA
Each strand appears like a helical staircase. Each step of ascent is represented by a pair of bases. At each step of ascent, the strand turns the pitch would be . The rise per base pair would be . this form of DNA with the above mentioned salient features is called B-DNA
Q5. Which of the following is an isozyme?
Solution
There are certain enzymes which have slightly different molecular structure but have similar catalytic function. Such enzymes are called isoenzymes or simply isozymes. LDH (Lactic dehydrogenase) is a good example of isoenzymes
There are certain enzymes which have slightly different molecular structure but have similar catalytic function. Such enzymes are called isoenzymes or simply isozymes. LDH (Lactic dehydrogenase) is a good example of isoenzymes
Q6. The figure given below shows three velocity substrate concentration curves for an enzyme reaction. What do the curves A, B and C depict respectively?
Solution
In the figure given in question, curve a shows normal enzyme reaction while curve b shows a competitive inhibition reaction, in which competitive that resemble the substrate molecules, bind to the active site of the enzyme, whereas curve c shows non-competitive inhibition reaction, in which the inhibitor binds to a part of the enzyme or enzyme substrate complex, other than the active site, known as the allosteric site.
In the figure given in question, curve a shows normal enzyme reaction while curve b shows a competitive inhibition reaction, in which competitive that resemble the substrate molecules, bind to the active site of the enzyme, whereas curve c shows non-competitive inhibition reaction, in which the inhibitor binds to a part of the enzyme or enzyme substrate complex, other than the active site, known as the allosteric site.
Q7. Which one is the sweetest sugar?
Solution
Fructose is the sweetest sugar. It is found in sweet fruits and honey.
Fructose is the sweetest sugar. It is found in sweet fruits and honey.
Q8. Given below is the structural formula of
Solution
Q9. A competitive inhibitor, competes with the substrate, for the substrate binding site of enzymes due to its
Solution
When the inhibitor closely resembles the substrate in its molecular structure and inhibits the activity of the enzyme, it is known as competitive inhibitor. Due to its close structural similarity with the substrate, the inhibitor competes with the substrate for the substrate-binding site of the enzyme. Consequently, the substrate cannot bind and as a result, the enzyme action declines, ., inhibition of succinic dehydrogenase by malonate which closely resembles the substrate succinate in structure. Such competitive inhibitors are often used in the control of bacterial pathogens
When the inhibitor closely resembles the substrate in its molecular structure and inhibits the activity of the enzyme, it is known as competitive inhibitor. Due to its close structural similarity with the substrate, the inhibitor competes with the substrate for the substrate-binding site of the enzyme. Consequently, the substrate cannot bind and as a result, the enzyme action declines, ., inhibition of succinic dehydrogenase by malonate which closely resembles the substrate succinate in structure. Such competitive inhibitors are often used in the control of bacterial pathogens
Q10. The amino acids are acidic, basic and neutral based on the number of
Solution
Based on number of amino and carboxyl groups, amino acids are acidic (e.g., glutamic acid), basic (lysine) and neutral (valine)
Based on number of amino and carboxyl groups, amino acids are acidic (e.g., glutamic acid), basic (lysine) and neutral (valine)
