Cell Biology Quiz-05
Dear Readers,
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.
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Q1.
Many bacteria have small circular DNA outside the genomic DNA. These smaller DNA are called
Solution
(a) Many bacteria have small circular DNA outside the genomic DNA. These smaller DNA are called plasmids
(a) Many bacteria have small circular DNA outside the genomic DNA. These smaller DNA are called plasmids
Q2.
The scientist who was awarded Nobel-Prize in 1959 for in vitro synthesis of polyribonucleotide?
Solution
(d) S Ochoa was awarded Nobel Prize in 1959 along with A Kornberg for in vitro synthesis of polyribonucleotides, while A Kornberg alone was related with DNA synthesis.
(d) S Ochoa was awarded Nobel Prize in 1959 along with A Kornberg for in vitro synthesis of polyribonucleotides, while A Kornberg alone was related with DNA synthesis.
Q3.
In prokaryotic cells,
Solution
(d) In prokaryotic cell, the ribosomes are 70 S type, nucleus and all the membrane bound cell organelles are absent. The genetic material lies in the middle as nucleoid.
(d) In prokaryotic cell, the ribosomes are 70 S type, nucleus and all the membrane bound cell organelles are absent. The genetic material lies in the middle as nucleoid.
Q4.
RNA is not found in
Solution
(b) Plasmalemma lacks RNA
(b) Plasmalemma lacks RNA
Q5.
Plant and animal cells, both have
Solution
(b) Plant and animal cells, both have cell membrane and nucleolus
(b) Plant and animal cells, both have cell membrane and nucleolus
Q6.
Stain used by Feulgen to stain DNA is
Solution
(b) Basic fuchsin is used by Feulgen to stain DNA.
(b) Basic fuchsin is used by Feulgen to stain DNA.
Q7.
The types of ribosome found in prokaryote is
Solution
(d) Ribosomes are electron microscopic ribonucleoprotein particles attached either on RER in eukaryotic cell or free in cytoplasm in prokaryotic cell. The ribosomes found in prokaryotes, chloroplast and mitochondria are 70 S while in eukaryotes are 80 S type.
(d) Ribosomes are electron microscopic ribonucleoprotein particles attached either on RER in eukaryotic cell or free in cytoplasm in prokaryotic cell. The ribosomes found in prokaryotes, chloroplast and mitochondria are 70 S while in eukaryotes are 80 S type.
Q8.
An analysis of a DNA (double strandard) sample yielded 18% cytosine. What would be the percentage of other bases in this sample?
Solution
(a) According to Chargaff’s rule, in DNA purines and pyrimidines are always in equal proportion (i.e., A+G=T+C) and proportion of adenine is always equals to that of thymine, while proportion of guanine always equals to that of cytosine (i.e., A=T and G=C). So, option (a) is correct.
(a) According to Chargaff’s rule, in DNA purines and pyrimidines are always in equal proportion (i.e., A+G=T+C) and proportion of adenine is always equals to that of thymine, while proportion of guanine always equals to that of cytosine (i.e., A=T and G=C). So, option (a) is correct.
Q9.
The cell organelle associated with intracellular digestion of macromolecules is
Solution
(a) Lysosomes are the reservoirs of hydrolytic enzymes and are known as suicidal bags of the cells. These are involved in extracellular as well as intracellular digestion and show autophagy (digestion of surplus organelles) and autolysis (self- destruction of the cell).
(a) Lysosomes are the reservoirs of hydrolytic enzymes and are known as suicidal bags of the cells. These are involved in extracellular as well as intracellular digestion and show autophagy (digestion of surplus organelles) and autolysis (self- destruction of the cell).
Q10.
The enzyme DNA polymerase was discovered by
Solution
(a) DNA polymerase enzyme was discovered by Kornberg in 1957 in E.coli. There are three polymerases present in E.coli namely, polymerase-I, polymerase-II, polymerase-III.
(a) DNA polymerase enzyme was discovered by Kornberg in 1957 in E.coli. There are three polymerases present in E.coli namely, polymerase-I, polymerase-II, polymerase-III.
