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Cell Biology Quiz-10

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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.   Ribosomes that occur exclusively in mitochondria is
  •  70 S
  •  55 S
  •  30 S
  •  50 S
Solution
(b) Besides DNA, a mitochondrion has RNA and its ribosomes also. Thus, a complete protein synthesising machinery is present in mitochondria. The ribosomes of mitochondria are small, i.e., 55-60 S type, with a large subunit of 40 S and a small subunit of 30 S. The large subunit contain 16-17 S and 5S rRNA and the small subunit 12-13 S rRNA.

Q2.   Nucleotide consists of
  •  Phosphate only
  •  Phosphate and sugar only
  •  Phosphate, sugar and nitrogen base
  •  Phosphate and nitrogen base only
Solution
(c) A sugar molecule and a nitrogenous base form a nucleoside, and a nucleoside plus a phosphate group form a nucleotide. The nucleotides of RNA are called ribonucleotides, and those of DNA deoxyribonucleotides. Ribonucleotides contain the sugar ribose and deoxyribonucleotides contain the sugar deoxyribose.

Q3.   Statements
I. The four nucleotide bases are not necessarily present in DNA in exact equal proportions.
II. The total amount of purines are equal to the total amount of pyrimidines.
III. DNA ligase enzyme act to hydrolyse or breakdown a polynucleotide chain into its component nucleotides.
IV. Nuclease enzymes are capable of restoring an intact DNA duplex. Of the above statements
  •  II is correct, but I, III and IV are wrong
  •  I and II are wrong but III and IV are correct
  •  I, II and III are correct but IV is wrong
  •  I and II are correct but III and IV are wrong
Solution
(d) DNA fragments can be rejoined under the appropriate renaturation conditions by using the enzyme DNA ligase to reform the missing phosphodiester linkages in each strand. An exonuclease in an enzyme which degrades nucleic acids from ends, while an endonuclease is an enzyme which degrades nucleic acid by making internal cuts.
Q4.   Within the cell, ribosomes are found in
  •  Cytoplasm
  •  Chloroplasts (in plants) and mitochondria
  •  Rough ER
  •  All of the above
Solution
(d) In eukaryotes, ribosomes are found in chloroplasts and mitochondria. In prokaryotes, ribosomes occur freely in the cytoplasmic matrix In eukaryotic cells, RER possesses ribosomes attached to its membranes Ribosomes occur in all living cells with the exception of mammalian erythrocytes or red blood corpuscles

Q5.   Golgi complex works for
  •  Excretion
  •  Respiration
  •  Secretion
  •  Reduction
Solution
  (c) Golgi body is cell organelle, which was first discovered by an Italian neurologist Camillo Golgi (1898) in nerve cells. The main function of Golgi body is secretion, cell plate formation, cell wall formation and acrosome formation during spermatogenesis.

Q6.   Ribosomes are particles about 200Å units in diameter consisting of protein and RNA. The percentage of protein and RNA respectively is
  •  60% and 40%
  •  40% and 60%
  •  80% and 20%
  •  50% and 50%
Solution
(d) Ribosomes are made up of protein and RNA in about equal amounts.

Q7.   Structural lipids of cell membrane are
  •  Simple lipid
  •  Chromolipids
  •  Steroid
  •  Phospholipids
Solution
(d) Cell membrane (plasmalemma) is composed of proteins, lipids and some amount of carbohydrate. Membrane lipid is primarily phospholipid. It contain both polar and non-polar portion.

Q8.   Inner membrane of mitochondria forms
  •  Cisternae
  •  Cristae
  •  Thylakoids
  •  Lamellae
Solution
(b) Inner membrane forms finger-like structures called cristae.

Q9.   Which one of the following correctly represents the manner of replication of DNA?
  •  

  •  

  •  

  •  

Solution
(d)
Q10.   In his bacteriophage experiments, Hershey and Chase demonstrated that DNA is genetic material in
  •  TMV
  •  Escherichia coli
  •  T_2 bacteriophage
  •  Diplococcus pneumoniae
Solution
(c) Bacteriophage experiment was conducted by Hershey and Chase, (1952). They selected T_2 type phages for experimentation. From this experiment, they conclude that only DNA (and not proteins) pass from one generation to another.

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Cell Biology Quiz-10
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