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Biology lecture notes

posted Dec 12, 2013, 6:06 AM by jaleelkabdul jaleel   [ updated Dec 12, 2013, 6:07 AM ]

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posted Jan 29, 2012, 7:34 AM by jaleelkabdul jaleel   [ updated Dec 12, 2013, 6:00 AM ]

 

  

Cell Biology MCQ

posted Dec 23, 2010, 8:31 PM by jaleelkabdul jaleel   [ updated Sep 14, 2013, 9:51 PM ]

  1. The cytoplasmic connections of adjacent cells in

         plants is maintained through

                (a) Porins                              

                (b) Plasmodesmata

                (c) Apoplasmic substances

                (d) Blind pits

                 (e) All except (c)

 2. The endomembrane system in a cell includes

                (a) Endoplasmic reticulum

                (b) Golgi complex

                (c) Lysosomes                     

                (d) Vacuoles

                (e) All of these

 3. The Smooth endoplasmic reticulum is mainly

     concerned with

                (a) protein synthesis            (b) Secretion

                (c) Lipid synthesis                (d) DNA synthesis

                (e) All except (d)

 4. Which of the following is not true of Golgi apparatus

                (a) They were first observed by Camillo Golgi

(b) They consist of cisternae, vesicles and  

      Tubules

                (c) Cis Phase of cisternae is the forming face

                (d) The main function is to package materials for

                  transport

                (e) Golgi apparatus is found in Prokaryotic cells

5. The ‘Suicidal’bag of an animal cell is

                (a)Spherosome                     (b) Dictyosome

                (c) Lysosome                        (d) Endosome

                (e) None of these

6. The single membrane of a vacuole is called

                (a) Tonoplast                        (b) Vacuoplast

                (c) Casparian strip               (d) Unit membrane

                (e) Aleuroplast

7. The ‘Power house of a cell” is

                (a) Lysosome                       (b) Golgi apparatus

                (c) Mitochondria                  (d) Centriole

                (e) ER

8. The inner membrane of the Mitochondria are folded

          inwards towards matrix to form

                (a) Mesosomes                     (b) Cristae

                (c) Glyoxysome                   (d) Phagosome

                (e) Pinosome

9. Mitochondria divides by

                (a) Cell division in which cell plate is

                    always found

                (b) Amitosis

                (c) Fission

                (d) Meiosis

                (e) Budding

10. Ribosomes found in mitochondria are of the type

                (a) 80S                                   (b) 60S

                (c) 70S                                   (d) 50S

                (e) 30S

11. Coloured plastids containing fat soluble pigments

         like carotene and xanthophyll are

                (a) Chloroplast                     (b) Chromoplast

               

 

 

(c) Leucoplast                      (d) Bioplast

                (e) Symplast

   12. Type of Leucoplast which store starch are called

                (a) Amyloplast                     (b) Elaioplast

                (c) Aleuroplast                      (d) Proteinoplast

                (e) Bioplast

   13. Number of chloroplast found in Chlamydomonas is:

                (a) One                                  

                (b) Two and sometimes three

                (c) Numerous                       

                (d) Indeterminate

                (e) Five

   14. Shape of chloroplast found in Spirogyra

                (a) Lens shaped                   (b) Oval

                (c) Spherical                          (d) Discoid

                (e) Ribbon like

   15. Thylakoids are

                (a) Double membrane bound

                (b) Single membrane bound

                (c) Found in periplastidal space

                (d) Parts where chlorophyll is seen

                (e) Both (b) and (d)

   16. Similarity between chloroplast and Mitochondria

                (a) Both are organelles

                (b) Both are double membrane bound

                (c) Both are semiautonomous

                (d) Both contain DNA

                (e) All of these

   17. Ribosomes are composed of

                (a) RNA only                        (b) Proteins only

                (c) Lipids only                      (d) RNA and Proteins          (e) RNA and lipids

   18. Size of the ribosomes is indirectly indicated by

        ‘S’ which stands for

                (a) Subunit           

                (b) Sedimentation coefficient

                (c) Size

                (d) Schwann (Name of its discoverer)

                (e) Sphere

   19. The core of a eukaryotic flagellar filament is called

                (a) Cytoskeleton                 (b) Centrosome

                (c) Dyenin                             (d) Axoneme

                (e) Spoke

   20. The microtubular arrangement in the flagellar

         filament is represented as

                (a) 9+0                                   (b) 9+2

                (c) (9) + 1                               (d) 13 + 0

                (e) 12 + (1)

KEY

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

A

D

A

E

C

B

B

D

D

E

A

C

D

C

C

E

C

C

E

C


 











































posted Dec 19, 2010, 5:22 AM by jaleelkabdul jaleel   [ updated Dec 12, 2013, 5:57 AM ]

Apoptosis

posted Dec 19, 2010, 5:17 AM by jaleelkabdul jaleel   [ updated Sep 14, 2013, 10:41 PM ]

Apoptosis:Apoptosis or Programmed cell death is an essential process for multicellular organism growth, and is a highly-organized process.

During  apoptosis classical apoptotic cell death, heterochromatin forms from chromatin and moves towards the nuclear periphery olf the cell.The Cell contents of an apoptotic cell remain membrane-bound as apoptotic bodies, which are then phagocytized, causing no disruption such as inflammation.Apototic Necrotic cells typically spill their contents into the extracellular space, eliciting an inflammatory response .

Steps in apoptosis

Once apoptosis is started , there are key cellular events which arise.

Theyse are:

Shrinkage ing and rounding of the cell membrane.

via chromatin condensation and DNA compaction.

DNA distruction or fragmentation

Condensation of cCytoplasm and  cell organelles.

Vesicle formation by membrane blebbing and formation of apoptotic bodies.

Phagocytosis of the apoptotic bodies

 


posted Oct 13, 2009, 12:54 AM by jaleelkabdul jaleel   [ updated Dec 12, 2013, 5:30 AM ]


 

posted Oct 13, 2009, 12:53 AM by jaleelkabdul jaleel   [ updated Dec 12, 2013, 5:31 AM ]

 


posted Oct 13, 2009, 12:52 AM by jaleelkabdul jaleel   [ updated Dec 12, 2013, 5:43 AM ]

 


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