Cell Biology Quiz-06

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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.   What is mitoplast?
  •  Membraneless mitochondria
  •  Another name of mitochondria
  •  Mitochondria without outer membrane
  •  Mitochondria without inner membrane
(c) A mitochondria that has its outer membrane removed is called mitoplast.

Q2.   Enzyme catalase is seen in
  •  Lysosome
  •  Spherosome
  •  Peroxisome
  •  All of these
(c) Enzyme catalase is found in peroxisome.

Q3.   Fat is stored in the plant cell in
  •  Lysosome
  •  Spherosome
  •  Microsome
  •  Peroxisome
(b) Spherosomes are single membrane bound small spherical organelles, which synthesize and store fats in plants. They develop from ER. Spherosomes were called as microsomes by Hanstein (1880). Spherosomes in plant cells correspond to lysosomes in animal cells.
Q4.   In prokaryotes, genetic material is
  •  Basically naked
  •  Enveloped by a nuclear membrane
  •  Associated with histones
  •  Linear
(a) In prokaryotes, genetic material is basically naked. In prokaryotes, additional small circular DNA entities called plasmids are present. Plasmids carry additional specific factors like nitrogen fixation, resistance, fertility, etc. DNA present as genetic material is naked and often called genophore, nuclear body or nucleoid

Q5.   In eukaryotes, basic structural unit made up of histone and DNA is
  •  Nucleosome
  •  Nucleolus
  •  Chromosome
  •  Lysosome
  (a) In eukaryotes, DNA is tightly bound to histones which form a DNA protein particle called nucleosome.

Q6.   Polysome is formed by
  •  Several ribosomes attached to a single mRNA
  •  Many ribosomes attached to a strand of endoplasmic reticulum
  •  A ribosome with several subunits
  •  Ribosomes attached to each other in a linear arrangement
(a) In prokaryotes, ribosome attach to the 5’ end of mRNA as soon as transcription begins. A bunch of ribosome moves along a single mRNA molecule adding 15 amino acids/second to the polypeptide chain, almost the same speed at which RNA polymerase transcribes the mRNA.

Q7.   Extension of plasma membrane in prokaryotic cell is
  •  Mesosome
  •  Haploid
  •  Ribosome
  •  None of these
(a) In bacteria (prokaryote), on the plasma membrane generally at mid point, there are present some circular coiled bodies called mesosomes, which contain respiratory enzymes like oxidases, dehydrogenase and hence, they help in respiration.

Q8.   Cilia are
  •  Short (5-10μm) hair-like narrow protoplasmic process
  •  With sweeping or pendular movements
  •  More numerous
  •  All of the above
(d) A cilium has the appearance of a sharp-pointed straight or curved hair that projects 5-10μm. Many cilia often project from a single cell. The cilium moves forward with a sudden rapid whiplike stroke 10-20 times per second than it moves backward slowly to its original position.

Q9.   If a cell has a twice as much DNA as in a normal functional cell it means that the cell
  •  Is preparing to divide
  •  Has completed division
  •  Has reached the end of its life span
  •  Has ceased to function
(a) A growing cell undergoes a cell cycle that consist essentially of two periods interphase and mitotic phase. Interphase is the period which cells prepare for cell division by synthesising RNA and protein (in G_1 and G_2-phase) and DNA (in S-phase). Thus, if cell has twice as much DNA as in a normal functional cell, it means that the cell is preparing to divide.

Q10.   There are special proteins that help to open up DNA double helix in front of the replication fork. These protein are
  •  DNA ligase
  •  DNA gyrase
  •  DNA polymerase-I
  •  None of these
(b) DNA gyrase unwinds the DNA strands during DNA replication.

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Cell Biology Quiz-06
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