Cell biology IV - Nucleic acids

1. [A]: DNA and RNA are acidic in nature

    [R]: They have pentose sugars

    1) Both A and R are true and R is the correct explanation of A

    2) Both A and R are true but R is not the correct explanation of A

     3) A is true but R is false 4) A is false but R is true

2. The nitrogen base Cytosine is

    1) Monocyclic, Homocyclic                                2) Dicyclic, Heterocyclic

    3) Monocyclic, Heterocyclic                               4) Dicyclic, Homocyclic

3. In a given nucleotide

    1) Phosphate is attached to 1st position of Nitrogen base and Nitrogen base is attached       to 1st carbon of sugar

    2) Phosphate is attached to 2rd Carbon and Nitrogen base to the 1st carbon of the pentose sugar

   3) Uracil is attached to 1st Carbon of Deoxyribose and phosphate to the 5th carbon of the sugar

   4) Phosphate is attached to 5th carbon and Nitrogen base to the 1st carbon of Pentose sugar

4. These components of DNA are 5-Carbon substances

     I. Sugar        II. Adenine        III. Guanine       IV. Cytosine         V. Thymine

     1) All except V      2) All except II        3) All except IV          4) All except III

5. DNA replication is initiated with the catalytic activity of

   1) DNA polymerase      2) DNA ligase      3) Topoisomerase      4) Helicase

6. A given DNA has 4 spirals with the following condition in its different spirals

      I. A spiral with 28 hydrogen bonds         II. A spiral with 6 Guanine bases

     III. Spiral with 25 hydrogen bonds          IV. Spiral with 6 Adenine bases

  Arrange the above 4 different spirals in a sequence of gradual increase in the number of    methylated nitrogen bases

     1) I, II, III, IV      2) I, III, II, IV      3) IV, II, III, I        4) III, II, IV, I

7. In a B-DNA molecule, there are 300 hydrogen bonds, These hydrogen bonds are formed in 3:2 ratio between GC and AT. Then the ratio between number of Adenine and Cytosine bases in the DNA is

      1) 3:2           2) 2:3         3) 3:4             4) 1:1

8. The most common nitrogen base seen in various non-sense codons and initiating codons is

    1) Adenine   2) Guanine        3) Uracil                 4) Cytosine

9. Match the following

List – I                                                                                   List – II                                A B C D

A) Trasfer of genetic material from parents to offspring    I) Watson                        1) V I IV III

B) DNA as double stranded structure                                     II) E. Chargaff               2) V II III IV

C) Amount of Adenine is equal to the amount of Thymine in DNA III) L. Pauling     3) V I II III

D) Presence of 3 hydrogen bonds between Guanine and Cytosine IV) Avery etal 4) IV I II III

                                                                                                                 V) Hershey



10. Study the following table and choose the correct combination

Nucleic acid              Character I                                                           Character II

I) mRNA         Has intra-strand hydrogen bonds                                   Has codons

II) tRNA           Has intra-strand hydrogen bonds                          Anticodon can be UAA

III) DNA          Has inter strand hydrogen bonds            Every helix has 10 dicyclic nitrogen bases

IV) rRNA            Has inter strand hydrogen bonds                  synthesised on DNA stand

1) I and II               2) II and III                     3) III and IV                      4) I and IV

11. Guanine and Cytosine exist in 1:1 ratio but not Adenine and Thymine in

         1) M 13 virus        2) mRNA             3) tRNA                    4) Reovirus

12. The following nucleic acid always ends with Adenine nucleotide

                 1) mRNA                 2) tRNA                3) rRNA              4) DNA

13. rRNA is mainly transcribed on the DNA of chromosomes which must have

           1) Secondary constriction II                             2) Secondary constriction I

           3) Telocentric condition                                       4) Isobrachial chromosomes

Cell biology III - Chromosomes

1. [A]: Chromosomes are stained with basic dyes
    [R]: They have basic proteins known as Histones

     1) Both A and R are true and R is the correct explanation of A

     2) Both A and R are true but R is not the correct explanation of A

     3) A is true but R is false 4) A is false but R is true

2. The plant with longest normal chromosomes belongs to series

   1) Thalamiflorae      2) Calyciflorae      3) Coronariae       4) Bicarpellatae

3. Hofmeister observed the chromosomes of

      1) Mitotic stage      2) Interphase       3) Meiotic stage          4) Cytokinesis stage

4. Arrange the following in a sequence of gradual increase in their chromosomal number

         I. Primary Endosperm Nucleus of Gossypium hirsutum
         II. Egg cell of Saccharum
        III. Sperm cell of Nicotiana
       IV. Colchicine treated Allium meristematic cell

   1) III, IV, I, II      2) III, II, IV, I        3) III, IV, II, I            4) IV, III, II, I

5. Identify the group with similar chromosome number

     1) Triploid Allium, diploid Oryza, haploid Nicotiana

     2) Pentaploid haplopappus, Haploid Maize, Haploid Oryza

     3) Tetraploid Oryza, Hexaploid Allium, Diploid Gossypium

     4) Tetraploid Zea, Haploid Saccharum, Triploid Pisum

6. Karyotype does not indicate

    1) Position of secondary constriction
    2) Size of chromosomes
    3) Types of genes present in a chromosome
    4) Number of chromosomes in a cell

7. In a metaphasic chromosome the ratio between the number chromatids and chromosomal  arms is 1:1. The chromosome must be

    1) Metacentric     2) Telocentric     3) Sub-metacentric     4) Acrocentric

8. Heteropycnosis refers to

    1) Differential staining nature of chromosome
    2) Non-uniform coiling of chromonema

    3) Differential distribution of Histone proteins in the chromosome

    4) Presence of chromosomes of different sizes in a genome

9. Study the following table and choose the correct combination

List I                                     List II                                                                                             List III

I) Telomere      Present in all typical eukaryotic chromosomes                   Has circular DNA ends

II) Satellite           Present in all chromosomes                                           Lacks DNA

III) Secondary constriction     Unstainable portion DNA            can not be transcribed

IV) Primary constriction           Unstainable portion                Negligible coiling of chromonema

1) I and II       2) III and IV        3) I and IV             4) II and III

10. [A]: Histones are basic proteins

      [R]: Core proteins of nucleosome are rich in aminoacids Argenine and Lysine

     1) Both A and R are true and R is the correct explanation of A

     2) Both A and R are true but R is not the correct explanation of A

     3) A is true but R is false 4) A is false but R is true

11. Nucleolar organizer is

      1) Secondary constriction I                 2) Secondary constriction II

      3) Primary constriction II                      4) Primary constriction I

12. The following histone is present outside the nucleosome

       1) H2A         2) H4           3) H3               4) H1

13. The total number of chromatids seen in Metaphasic meristematic cell of Pisum is

      1) 14           2) 28                 3) 56                 4) 16

Cell biology II

1.The statement that protoplasm as active centre for various biological processes was given by
1) Dujardin 2) Corti 3) Purkinje 4) Von Mohl
2 [A]: Protoplasm shows Brownian movement
[R]: It has about 85 – 90% of water
1) Both A and R are true and R is the correct explanation of A
2) Both A and R are true but R is not the correct explanation of A
3) A is true but R is false 4) A is false but R is true
3. Choose the incorrect statement with respect to protoplasm
1) Polypeptides are most abundantly present organic compounds.
2) Protoplasm is coagulated at 60oC because it has 88% of water
3) When protoplasm is exposed to a light beam it reflects some of the light
4) The pH of protoplasm is sometimes 7.2
4. According to Trilamellar model
1) The plasma membrane has biprotein layer sandwitched between slices of lipids
2) Protein and lipid monolayers are alternately arranged
3) Protein and Lipid molecules are arranged in a total of 4 tiers
4) The thickness of each monolipid layer is 35Ao
5. Cytosol is devoid of
I. Enzymes II. Ribosomes III. Vacuoles
1) I and II 2) II and III 3) I and III 4) I, II, III
6. The double membrane bound cell organelles of typical eukaryotic plant cell are
I. Mitochondria II. Golgi complex III. Endoplasmic reticulum IV. Nucleus
1) I and II 2) II, III, IV 3) I and IV 4) All
7. [A]: Blue-Green algae do not have plastids
[R]: They lack photosynthetic pigments
1) Both A and R are true and R is the correct explanation of A
2) Both A and R are true but R is not the correct explanation of A
3) A is true but R is false 4) A is false but R is true
8. Endosperm of cereals has
I. Elaioplasts II. Aleuroplasts III. Amyloplasts IV. Chromoplasts
1) only III 2) I, II, III 3) II, III 4) All except I
9. According to Fluid Mosaic model, the matrix of cell membrane is mainly made of
1) Oligosaccharides 2) Proteins *3) Phosopholipids 4) Glycolipids
10. Match the following
List – I List – II A B C D
A) Sachs I) Trilamellar model 1) V IV III I
B) Schimper II) Fluid Mosaic Model 2) V III II I
C) Leeuwenhoek III) First discovered Plastids 3) IV V II III
D) Nicolson IV) The term plastid 4) V IV III II
V) Discovered Chloroplast

11. Study the following table and choose the correct combination
Structure of Chloroplast Character I Character II
I) Envelope Lacks pigments Transport of substances into cytosol
II) Storma CO2 assimilation Polypeptide synthesis
III) Thylakoid membrane Electron transport Proton transport
IV) Lumen Release of O2 Utilisation of CO2
1) I and II 2) II and III 3) III and IV 4) I, II, III
12. Arrange the following events in correct chronological order of their discovery
I. Trilamellar model II. Plastids III. Nucleus IV. Fluid Mosaic model
1) II, III, I, IV 2) III, II, I, IV 3) II, III, IV, I 4) III, II, IV, I
13.[A]: Chloroplasts are described as semiautonomous cell organelles
[R]: Green plastids have their own DNA and ribosomes and can synthesize all of their proteins
1) Both A and R are true and R is the correct explanation of A
2) Both A and R are true but R is not the correct explanation of A
3) A is true but R is false
4) A is false but R is true

Cell Biology I

1.The first discovered living cell was
1) Cell of Quercus suber 2) Prokaryote
3) RBC 4) Protozoan cell
2.The microscope with high resolution is
1) Phase contrast Microscope 2) Flurescence Microscope
3) Compound Microscope 4) Electron Microscope
3.The cell wall material distributed in all the three layers of cell wall is
1) Cellulose 2) Hemicellulose 3) Cutin 4) Pectin
4.Match the following
List – I List – II A B C D
A) Micrographia I) Dujardin 1) III V IV I
B) Cell theory II) Corti 2) V III IV II
C) Cell lineage theory III)Robert Hooke 3) III IV II I
D) Sarcode IV)R. Vircho 4) III V IV II
V)Schleiden

5.[A]: Flurescence microscope is a light microscope
[R]: Visible light is used to observe the object
1) Both A and R are true and R is the correct explanation of A
2) Both A and R are true but R is not the correct explanation of A
3) A is true but R is false 4) A is false but R is true
6.Cell walls of isolated cells lack
1) Primary wall 2) Secondary wall 3) Middle lamellum 4) Pits
7.Torus is thickened portion of
1) Primary wall 2) Secondary wall
3) Middle lamellum 4) Middle lamellum of Pit region
8.Cell wall material not deposited by intussusception is
1) Pectin 2) Lignin 3) Cutin 4) Cellulose
9.Cellulose forms the frame work of
I. Middle lamellum II. Primary wall III. Secondary wall
1) I and II 2) II and III 3) only II 4) I, II, III