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cell biology Quiz-29

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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.  Schleiden (1838) proposed that cell is the structural and functional unit of life. His idea was a/an
  •   Assumption
  •   Generalisation
  •   Hypothesis
  •   Observation
Solution
(c) Schleiden (1838) proposed a hypothesis that cell is the structural and functional unit of life.

Q2. Plant cell may be without
  •   Plastids
  •   Vacuoles
  •   Centrioles
  •   Cell wall
Solution
The centrosome is present in animals and some lower plants such as dinoflagellates,Eugulena and ,chlamydomonas etc. The term centrosome is applied to a pair of centrioles which is also called diplosome.

Q3.   Antiparallel strands of a DNA molecule means that
  •  One strand turns anti-clockwise
  •  The phosphate groups of two DNA strands at their ends, share the same position
  •  The phosphate groups at the start of two DNA strands are in opposite position(pole)
  •   One strand turns clockwise
Solution
(c) J D Watson and F H C Crick (1953) showed that DNA has a double helical structure with two polynucleotide chains connected by hydrogen bonds and running in opposite directions (antiparallel). The antiparallel strands of a DNA molecule means that the phosphate groups at the start of two DNA strands are in opposite position (pole).

Q4.  Subunits of 80 S ribosome are
  •   40 S
  •   60 S
  •   Both (a) and (b)
  •   None of these
Solution
(c) In eukaryotes, 80 S type ribosomes are found. They are divided into two subunits, the larger is 60 S and smaller is 40 S.

Q5. The thickness of unit membrane is
  •   20Å
  •   35Å
  •   55Å
  •   75Å
Solution
  (d) The unit membrane, described by J David Robertson, was considered as 75 Å thick trilaminar (3 layered membrane). According to his unit membrane or trilaminar model, unit membrane consists of 35Å thick bimolecular phospholipid layer between two protein layers, each with 20Å thickness.

Q6. What is true about tRNA?
  •  It binds with an amino acid at its. 3’ end
  •  It has five double stranded regions
  • It has a codon at one end which recognises the anticodon on messenger RNA
  •  It looks like clover leaf in the three dimensional structure
Solution
(a) RNA has amino acid binding site at the 3’ end having CCA codon. It looks like clover leaf in two dimensional structure and have anticodon site on anticodon loop.

Q7. The plasmid DNA confers certain unique characters to bacteria in which they are found. This include I. resistance to antibiotics II. no resistance to antibiotics III. monitor bacterial transformation with foreign DNA The correct option is
  •   Only I
  •   Only II
  •   I and III
  •   II and III
Solution
(a) The plasmid DNA confers certain unique phenotypic characters to such bacteria in which they are found. One such character is resistance to antibiotics

Q8. Lipid molecules in plasma membrane are arranged in which manner?
  •   Scattered
  •   Series
  •   Alternate
  •   Head parallel
Solution
(d) Four major classes of lipids are commonly presents in the plasma membrane, phospholipids, sphingolipids, glycolipids and sterols. According to fluid mosaic model, the lipids are present as bilayer at right angle to the surface (, head parallel).

Q9. If a length of DNA has 45,000 base pairs, how many complete turns will the DNA molecule takes?
  •   4,500
  •  45,000
  •   45
  •   450
Solution
(a) According to Watson and Crick’s DNA model, DNA exists as double helix in which two polynucleotide chains are coiled about one another in a spiral way (a right handed spiral). The base pairs in DNA are stacked 3.4Å apart with 10 base pairs in a turn (360degree) °on the double helix. Therefore, if the length of DNA has 45,000 base pairs, DNA molecule will take 4,500 complete turns.

Q10.  Which one is referred to as soluble RNA?
  •   mRNA
  •   tRNA
  •   rRNA
  • ssRNA
Solution
(b) tRNA is referred to as soluble RNA.

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quiz 29 cell biology
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