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Cell Biology Quiz-08

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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.   Select the double membrane bound cell organelles
  •  Chloroplast
  •  Nucleus
  •  Mitochondria
  •  All of these
Solution
(d) Chloroplast A chloroplast is covered by an envelope made up of two smooth membranes Nucleus A nucleus is a specialised double membrane bound protoplasmic body which contains all the genetic information for controlling cellular metabolism and transmission to the posterity Mitochondria A mitochondria contains two membranes and two chambers, i.e., outer and inner. The two membranes forms the envelope of the mitochondrion

Q2.   In a prokaryotic cell, the ratio of A+T/G+C is
  •  greater than 1
  •  less than 1
  •  equals to 1
  •  None of these
Solution
b) In a prokaryotic cell, the ratio of A + T/G + C is low, ie. less than 1

Q3.   The double helix model of Watson and Crick is known as
  •  C-DNA
  •  B-DNA
  •  Z-DNA
  •  D-DNA
Solution
(b) J d Waston and F H C Crick (1953) proposed a double helical structure of DNA. It is also known as right handed B-DNA.
Q4.   Which of the following features are correct regarding ribosomes?
I. Non-membrane bound
II. Absent in plastids and mitochondria
III. Present in the cytoplasm and RER
IV. Take part in protein synthesis
The correct option is
  •  Only II
  •  I and II
  •  I, II, III and IV
  •  I, III and IV
Solution
(d) Ribosomes are naked ribonucleoprotein protoplasmic particles in which a covering membrane is absent. The ribosomes are of two types, i.e., cytoplasmic and organelle. The organelle ribosomes are found in plastids and mitochondria. The cytoplasmic ribosomes may remain free in the cytoplasmic matrix or attached to the cytosolic surface of ER with the help of SRP protein. The bound ribosomes, generally transfer their proteins to cisternae of the ER for their transport to other parts, both inside and outside the cell

Q5.   The haploid content of human DNA is
  •  3.2 ×10^9 bp
  •  3.3×10^9 kbp
  •  4.6 ×10^6 bp
  •  48502bp
Solution
  (a) A complete set of chromosomes, or of chromosomal genes, inherited as a unit from one parent is called genome. Human genome contains 3.2×10^9 bp.

Q6.   Which enzyme joins DNA fragments?
  •  DNA ligase
  •  DNA polymerase
  •  DNA gyrase
  •  Topoisomerase
Solution
(a) DNA ligase joins DNA fragments.

Q7.   Telomerase is an enzyme, which is a
  •  Repetitive DNA
  •  RNA
  •  Simple protein
  •  Ribonucleoprotein
Solution
(d) Telomerase is a ribonucleoprotein.

Q8.   Identify the palindromic sequence in the following
  •  

  •  

  •  

  •  

Solution
(d) A palindrome is a sentence which reads the same forwards and backwards. The DNAs of several eukaryotes are shown to have palindromic sequences in which nucleotides of one strand going in one direction are same as the nucleotide of other strands going n other direction, e.g,



Q9.   Which of the following is not relevant to the structure of double helical DNA?
  •  The helix makes one completer spiral turn every 34Å
  •  The diameter of the helix is 20Å
  •  The distance between adjacent nucleotide is 3.4Å
  •  Each strands of helix has a backbone made up of alternating ribose sugar and phosphate
Solution
(d) The Watson and Crick model shows that DNA is a double helix with deoxyribose sugar-phosphate back bone on the outside and paired bases on the inside. The planes of the bases are perpendicular to the helix axis. The planes of sugars are nearly right angles to those of the bases.

Q10.   DNA repairing is done by
  •  Ligase
  •  DNA polymerase-III
  •  DNA-polymerase-II
  •  DNA-polymerase-I
Solution
(d) DNA polymerase-I enzyme corrects mistakes in DNA by removing mismatched nucleotides. It has proof reading activity and hence used in DNA repairing.

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Cell Biology Quiz-08
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