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Cell Biology Quiz-12

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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.   Which of the following differentiate plant cells from animal cells?
  •  Large vacuole, plastid and cell wall
  •  Cell wall, plastid and centriole
  •  Cell wall, plastid and mitochondria
  •  Cell membrane, plastid and cell wall
Solution
(a) All eukaryotic cells are not identical. Plant and animal cells are different as plant cells possess cell wall, plastids and a large vacuole which are absent in animal cells. On the other hand, animals cells have centrioles which are absent in almost all plant cells

Q2.   Clover leaf secondary structure of tRNA has anticodon arm which
  •  Contains in its loop three nucleotides of the codon
  •  Contains in its loop three nucleotides of the anticodon
  •  Contains in its no nucleotides
  •  Both (a) and (b)
Solution
(b) The anticodon loop of two-dimensional clover leaf model of tRNA consists of seven unpaired bases the third, fourth and fifth of which (form the 3’ end of molecule) constitute the anticodon. The anticodon permits complementary pairing with three bases on mRNA.

Q3.   In a double helix of DNA molecule of 10 coils, if there are 30 adenine nitrogen bases, what is the number of guanine nitrogen bases?
  •  30
  •  60
  •  70
  •  80
Solution
(c) Total number of coils in a DNA molecule=10. We know that total number of nitrogen bases are present in a coil=20 (or 10 pairs). Thus, total number of nitrogenous base is 200. Out of these, 30 are adenine thus, according to Chargaff’s rule guanine should be 70 in number.
Q4.   DNA can be formed by
  •  Transaminase
  •  Lyases
  •  RNA dependent DNA polymerase
  •  All of the above
Solution
(c) During DNA replication, enzymes DNA dependent DNA polymerase, primase and ligase are used, while RNA dependent DNA polymerase synthesises DNA form RNA during reverse transcription.

Q5.   The inward movement of ions into the cells is …… and the outward movement is ….
  •  Influx, efflux
  •  Efflux, influx
  •  Absorption, adsorption
  •  Adsorption, absorption
Solution
  (a) The movement of ions is called flux. The inward movement into the cells is influx and the outward movement is efflux.

Q6.   An organism exclusively with 70 S type of ribosomes contains one of the following
  •  DNA enclosed within the nuclear membrane
  •  Circular naked DNA
  •  Double-stranded DNA with protein coat
  •  Single-stranded DNA with protein coat
Solution
(b) Prokaryotic cells contain 70S type of ribosomes and double stranded, circular naked DNA without histone proteins, e.g., bacteria.

Q7.   Organelle important in spindle formation during nuclear division is
  •  Golgi body
  •  Chloroplast
  •  Centriole
  •  Mitochondrion
Solution
(c) The centrioles appear as two cylindrical structures. They are formed of microtubules. In higher animals, they form the mitotic pole, ie, they are involved in formation of spindle.

Q8.   Which of these is wrongly matched?
  •  Chloroplasts - Chlorophyll
  •  Elaioplasts - Starch
  •   Chromoplasts - Carotenoids
  •  Amyloplasts - Carbohydrates
Solution
(b) Elaioplast store oil.

Q9.   If there are 120 adenine molecules in a B-DNA double helical structure showing 20 coils, what is the number of pyrimidine nucleotides forming three hydrogen bonds in it?
  •  80
  •  100
  •  120
  •  140
Solution
(a) B-DNA shows 10 nucleotides per turn (coil) of helix, if there are 20 coils then total number of nucleotides is 200 out of which 120 are adenine (equal amount of thymine). So, the number of guanine (equal amount of cytosine) nucleotides is 80. Three hydrogen bonds are present between guanine and cytosine.

Q10.   The statement omnis cellula e cellula of Rudolf Virchow has been taken from his book
  •  Cellular Pathology
  •  Cellular Potency
  •  Micrographia
  •  Scala Naturae
Solution
(a) Virchow was a German pathologist. In 1858, he published his classical book Cellular Pathology in which he asserted that functional units of life, the cells are the primary sets of disease and cancer.

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Cell Biology Quiz-12
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