Differences Between Questions


Differences Between Leucoplasts and Chromoplasts ? 

Leucoplasts 

1: These are colourless plastids.

2: Usually occur in cells not exposed to sunlight.

3: Have internal lamellae.


4: Store reserve food materials. 

5: Have regular shape__ oval, spherical, rod_ like,etc.

6: Can change into other types of plastids.

7: Do not carry on photosynthesis. 

8: Do not allure animals. 

Chromoplasts 

1: These are coloured plastids with yellow, orange and red pigments. 

2: Occur usually in cells exposed to sunlight. 

3: Have degenerate internal lamellae. 

4: Impart bright colours to flowers and fruits.

5: Are often angular due to pigment crystals in them.

6: Do not change into other types of plastids. 


7: Carry  on photosynthesis. 

8: Allure animals for pollination and dispersal. 

Differences Between Microtubules and Microfilaments ? 

Microtubules: 

1: Are hollow cylinders.

2: About 200 to 270 A° thick.

3: Composed of 13 longitudinal protofilaments each.

4: Formed of protein tubules. 

5: Subunits are dimers that have bound GTP and GDP.

6: Are noncontractile.

7: Have no role in cytoplasmic streaming, endocytosis and exocytosis. 

Microfilaments:

1: Are solid rods.

2: About 50 to 60 A° thick.

3: Not composed of protofilaments.

4: Formed of proteins actin and myosin.

5: Subunits are monomers that have bound ATP and ADP.

6: Are contractile.

7:Play a role in cytoplasmic streaming, endocytosis and exocytosis. 

QNo: Differences Between Cilia and Flagella?

 Cilia:

1: Cilia are short, hair_ like organelles, 2_ 20 ųm in average length. 

2: They occur in relatively large numbers per cell.

3: They often cover the entire cell or the entire exposed surface of a cell.

4: They beat coordinately in groups or rows.

5: They show sweeping or rowing motion.

6: Cilia fuse in some protozoans to form undulating membranes,membranelles or cirri.

7: Cilim lacks flimmer filaments.

Flagella:

1: Flagella are long, whip_ like organelles that may be 10__ 200 ųm long.

2: They are usually fewer per cell.

3: They are often at one end of a cell.
 
4: They usually beat independently. 

5: They show undulatory motion.

6: Flagella do not fuse.

7: Flagellum may bear stiff hair, the flimmer filaments, on the side.


Differences Between Euchromatin and Heterochromatin 

Euchromatin 

1: It consists of thin, uncoiled, extended, scattered chromatin fibres.

2: It forms the bulk of chromatin.

3: It occupies most of the nucleus. 

4: It stains lightly. 

5: Its genes are active.

6: It is transcribed. 

7: It replicates early in S phase.

8: It permits crossing over.

Heterochromatin:

1: It consists of thick, coiled, compacted, localized chromatin fibres.

2: It forms a fraction of chromatin.

3: It lies close to the nuclear lamina.

4: It stains deeply.

5: Its genes are inactive. 

6: It is not transcribed. 

7: It replicates late in S phase.

8: It inhibits crossing over.

Differences Between Chromatin and Chromosomes? 

Chromatin: 

1: It is visible in the interphase nucleus. 

2: It is extended, uncondensed form of deoxyribnucleoprotein chains.

3: It appears as fine filaments lying crisscross, forming chromatin reticulum. 

4: It controls metabolism. 

5: Replication of DNA occurs in the chromatin phase.

Chromosomes 

1: Thess are visible in the M phase ( Phase of nuclear division).

2: They are coiled, condensed form of deoxyribnucleoprotein chains.

3: These appear as short, thick, rod _ like organelles.

4: Chromosomes distribute genetic information to the daughter cells.

5: Replication of DNA is suspended in chromosome phase.




















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