12TH STANDARD CHEMISTRY PROJECT- DYEING

 

CELL: THE UNIT OF LIFE

PREVIOUS YEAR NEET QUESTIONS

1.Which of the following components provides sticky character to the bacterial cell?

1. Cell wall
2. Nuclear membrane
3. Plasma membrane
4. Glycocalyx 

2. Which of the following cell organelles is responsible for extracting energy from carbohydrates to form ATP?

1. Lysosome
2. Ribosome
3. Chloroplast
4. Mitochondrian 

3. Water-soluble pigments found in plant cell vacuoles are

1. Chlorophylls
2. Carotenoids
3. Anthocyanins
4. Xanthophylls 

4. Which one of the following cell organelles is enclosed by a single membrane?

1. Chloroplasts
2. Lysosomes
3. Nuclei
4. Mitochondria  

5. Mitochondria and chloroplast are 

    I. Semi-autonomous organelles
    II. Formed by the division of pre-existing organelles and they contain DNA but lack protein-synthesizing machinery.

Which one of the following options is correct?

1. II is true, but I is false
2. I is true, but II is false
3. Both I and II are false
4. Both I and II are true

6. Microtubules are the constituents of 

1. Spindle fibres, centrioles & cilia
2. Centrioles, spindle fibres & chromatin
3. Centrosome, nucleosome & centrioles
4. Cilia, flagella & peroxisomes

7. A cell organelle containing hydrolytic enzyme is

1. Lysosome
2. Microsome
3. Ribosome
4. Mesosome 

8. Select the wrong statement

1. A bacterial cell wall is made up of peptidoglycan
2. Pili & fimbriae are mainly involved in the motility of bacterial cells
3. Cyanobacteria lack flagellated cells
4. Mycoplasma is a wall-less microorganism

9. Select the mismatch.

1. Gas vacuoles                  – Green bacteria cells
2. Large central vacuoles   – Animal cells
3. Protists                            – Eukaryotes
4. Methanogens                  – Prokaryotes

10. Which of the following structure is not found in a prokaryotic cell?

1. Nuclear envelope
2. Ribosome
3. Mesosome
4. Plasma membrane

11. Which of the following structures is not found in prokaryotic cells?

1. Plasma membrane
2. Nuclear envelope
3. Ribosome
4.  Mesosome

12. Balbiani rings are sites of 

1. Lipid synthesis
2. Nucleotide synthesis
3. Polysaccharide synthesis
4. RNA & protein synthesis

13. Which of the following are not membrane bound?

1. Vacuoles
2. Ribosomes
3. Lysosomes
4. Mesosomes

14. A protoplast is a cell 

1. Without plasma membrane
2. Without nucleus
3. Undergoing division
4. Without cell wall

15. Cellular organelles with membranes are

1. Nuclei, ribosomes & mitochondria
2. Chromosomes, ribosomes & endoplasmic reticulum
3. Endoplasmic reticulum, ribosomes & nuclei
4. Lysosomes, Golgi apparatus & mitochondria

16. The solid linear cytoskeletal elements having a diameter of 6nm & made up of a single type of monomer are known as

1. Microtubules
2. Microfilaments
3. Intermediate filaments
4. Lamins

17. The osmotic expansion of a cell kept in water is chiefly regulated by

1. Mitochondria
2. Vacuoles
3. Plastids
4. Ribosomes

18. A major site for synthesis of lipids is

1. RER
2. SER
3. Symplast
4. Nucleoplasm

19. The Golgi complex plays a major role

1. In trapping the light & transforming it into chemical energy
2. In digesting proteins & carbohydrates
3. As energy transferring organelles
4. In post translational modification of proteins & glycosidation of lipids

20. Ribosomal RNA is actively synthesised in

1. Lysosomes
2. Nucleolus
3. Nucleoplasm
4. Ribosomes

21. What is true about ribosomes? 

1. The prokaryotic ribosomes are 80S, where S stands for sedimentation oo coefficient
2. These are composed of ribonucleic acid & proteins
3. These are found only in eukaryotic cells
4. These are self-splicing introns of some RNAs

22. Select the correct statement from the following regarding cell membrane

1. Na⁺ & K⁺ ions move across cell membrane by passive transport
2. Proteins make up 60 to 70% of the cell membrane
3. Lipids are arranged in a bilayer with polar heads towards the inner part
4. Fluid mosaic model of cell membrane was proposed by Singer & Nicolson

23. Which one of the following organisms is not an example of eukaryotic cells? 

1. Escherichia coli
2. Euglena viridis
3. Amoeba proteus
4. Paramecium caudatum

24. Important site for formation of glycoproteins & glycolipids is 

1. Golgi apparatus
2. Plastid
3. Lysosome
4. Vacuole

25. Which one of the following also acts as a catalyst in a bacterial cell?

1. sn RNA
2. hn RNA
3. 23S rRNA
4. 5S rRNA

26. Peptide synthesis inside a cell takes place in  

1. Mitochondria
2. Chromoplast
3. Ribosomes
4. Chloroplast

27. Which one of the following has its own DNA?

1. Mitochondria
2. Dictyosome
3. Lysosome
4. Peroxisome

28. The main arena of various types of activities of a cell is

1. Plasma membrane
2. Mitochondrion
3. Cytoplasm
4. Nucleus

29. Which one of the following structures between two adjacent cells is an effective transport pathway?

1. Plasmodesmata
2. Plastoquinones
3. Endoplasmic reticulum
4. Plasmalemma

30. The plasma membrane consists mainly of

1. Phospholipids embedded in a protein bilayer
2. Proteins embedded in a phospholipid bilayer
3. Proteins embedded in a polymer of glucose molecules
4. Proteins embedded in a carbohydrate bilayer