Multiple Choice QuestionsAssertion: Eukaryotic cells have the ability to adopt a variety of shapes and carry out directed movements.
Reason: There are three principal types of protein filaments - microfilaments, microtubules and intermediate filaments, which constitute the cytoskeleton.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
A.
If both assertion and reason are true and reason is the correct explanation of assertion.
The cytoskeleton is a fibrous network made or proteins that contributes to the structure and internal organization of eukaryotic cells within the cytoplasm. It is a dynamic structure that maintains cell shape, enables some cell motion (using structures such as flagella and cilia), and plays important roles in both intra-cellular transport (the movement of vesicles and organelles, for example) and cellular division.
The cytoskeleton has three major fibre types: microfilaments made ofactin protein, intermediate filaments made or various kinds of proteins (eg keratin), and microtubules made of tubulin.
During muscle contraction
size of 'A' bands remain same
size of 'H' zone becomes smaller
size of 'I' band decreases
diameter of fibre increases
The main difference between white and yellow fibres is of
protein
colour of fibres
both (a) and (b)
none of the above
Metha Jahar which is useful in rheumatism is obtained from
Aconitum napellus
Colchicum
Exogonium
Licorice
Which ribs show 'bucket-handle' type of movement?
Rib no. 1-2
Rib no. 3-5
Rib no. 6-10
Rib no. 11-12
Short Answer TypeMultiple Choice QuestionsOsteomalacia is a disease caused by the deficiency of
calciferol
tocopherol
retinol
phylloquinone
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