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CELL BIOLOGY Quiz-25

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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.  The two polynucleotide chains in DNA are
  •   Parallel
  •   Discontinuous
  •   Antiparallel
  •   Semi-conservative
Solution
In 1953, James Watson and Francis Crick suggested that in a DNA molecule there are two polynucleotide chains arranged antiparallel or in opposite directions.

Q2. DNA consists of two complementary nucleotide chains. If the sequence of nucleotides in one of the chains is AGCTTCGA then the complementary sequence of the other chain will be
  •   TCGAAGCT
  •   TCGTATCG
  •   AATTCCGG
  •   TCGAACTG
Solution
Adenine (A) is paired with Thymine (T) and Guanine (G) is paired with Cytosine(C).

Q3.   The length of DNA having 23 base pairs is
  •   78Å
  •   78.4Å
  •   74.8Å
  •   78.2Å
Solution
DNA is helically coiled macromolecule made up to two antiparallel polydeoxyribonucleotide chains held together by hydrogen bonds. One turn of spiral has a distance of 34Å. It contains 10 nucleotides in each chain so that the distance between adjacent nucleotides is 3.4Å. Hence, the length of DNA having 23 base pairs is 3.4×23=78.2Å.

Q4.  A nucleosome is a portion of the chromonema containing
  •   Only histones
  •   Both DNA and histones
  •   Only DNA
  •   Both DNA and RNA
Solution
The chromatin is formed of a series of repeating units called nucleosomes. Each nucleosome consists of a chain of DNA twist around a histone octamer. is associated with linker region.

Q5. Which of the following pair is mismatched?
  •   Capsule – Thick and tough glycocalyx
  •   Slime layer – Loose glycocalyx
  •   Pilli – Motility organ
  •   Bacterial cells – Motile or non-motile
Solution
  Pilli are not involved in locomotion. Actually, pilli are longer, fewer and thicker tubular outgrowths, which develop in response to or fertility factor in gram negative bacteria

Q6.  Select the wrong statement from the following
  •   Both chloroplasts and mitochondria contain an inner and an outer membrane
  •   Both chloroplasts and mitochondria have an internal compartment, the thylakoid space bounded by the thylakoid membrane
  • Both chloroplasts and mitochondria contain DNA
  •   The chloroplasts are generally much larger than mitochondria
Solution
Thylakoid space is present only ion chloroplasts. The inner membrane of mitochondria folded to form cristae.

Q7. The type of ribosomes found in prokaryotes is
  •   70S type
  •   80S type
  •   30S type
  •   50S type
Solution
The type of ribosome found in prokaryote is 70S type

Q8. One of the nucleotides of DNA is
  •   Adenine
  •   Deoxyadenylic acid
  •   Adenosine
  •   Deoxyuridine phosphate
Solution
DNA is a polymer of nucleotides, which comprise nitrogen base (A, G, T, C), sugar (deoxyribose) and phosphoric acid. The four types of nucleotides present in DNA are as follows: 



Q9. Which of the following constitutes about 10-20 of total cellular RNA?
  •   mRNA
  •   rRNA
  •   tRNA
  •   hnRNA
Solution
The transfer RNA or RNA is the smallest RNA, which are usually 70-80 nucleotides long. It constitutes about 10-20% of total cellular RNA. Since RNA are difficult to be separated by ultra centrifugation, they are also called as soluble RNA or RNA.

Q10.  In flagella membrane, which enzyme catalysis ATP activity?
  •  Cytoplasmic dyenin
  •   Asconic dynein
  •   Kinesis
  • Myosin
Solution
Motality of eukaryotic flagella is dependent upon ATPase activity. Enzyme asconic dynein catalyses ATP activity.

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