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[A] : The plasmalemmas of animals cells ...

[A] : The plasmalemmas of animals cells typically have the oligosaccharide chains of their glycolipids and exposed freely on their surfaces .
[R] : These play important roles in immunological responses , in cell-cell adhesion and identification of cell surface changes.

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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In hexagonal systems of crystals, a frequently encountered arrangement of atoms is described as a hexagonal prism. Here, the top and bottom of the cell are regular hexagons and three atoms are sandwiched in between them. A space-filling model of this structure, called hexagonal close-packed (HCP), is constituted of a sphere on a flat surface surrounded in the same plane by six identical spheres as closely as possible. Three spheres are then placed over the first layer so that they touch each other and represent the second layer. Each one of these three spheres touches three spheres of the bottom layer. Finally, the second layer is covered with a third layer that is identical to the bottom layer in relative position. Assume radius of every sphere to be ‘r’. The volume of this HCP unit cell is

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In a hexaonal system system of cycstals, a frequently encountered arrangement of atoms is described as a hexagonal prism. Here, the top and bottom of the cell are refular hexagons, and three atoms are sandwiched in between them. A space-cilling model of this structure, called hexagonal close-paked is constituted of a sphere on a flat surface surrounded in the same plane by six identical spheres as closely as possible. Three spherres are then placed overt the first layer so that they toych each other and represent the second layer so that they toych each other and present the second layer. Each one of the three spheres touches three spheres of the bottom layer. Finally, the second layer is convered with a third layer identical to the bottom layer in relative position. Assume the radius of every sphere to be r . The number of atom in this hcp unit cell is

In a hexaonal system system of cycstals, a frequently encountered arrangement of atoms is described as a hexagonal prism. Here, the top and bottom of the cell are refular hexagons, and three atoms are sandwiched in between them. A space-cilling model of this structure, called hexagonal close-paked is constituted of a sphere on a flat surface surrounded in the same plane by six identical spheres as closely as possible. Three spherres are then placed overt the first layer so that they toych each other and represent the second layer so that they toych each other and present the second layer. Each one of the three spheres touches three spheres of the bottom layer. Finally, the second layer is convered with a third layer identical to the bottom layer in relative position. Assume the radius of every sphere to be r . The empty space in this hcp unit cell is

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TRUEMAN BIOLOGY-Living World -ASSERTION AND REASON
  1. [A] : Saline drop contains sodium chloride. [R] : Sodium chloride ca...

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  2. Assertion. Lysosomes help in the process of photorespiration. Reason...

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  3. [A] : The plasmalemmas of animals cells typically have the oligosaccha...

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  4. [A] : Mitochondria are called power houses of the cell. [R] : Mitoch...

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  5. [A] : Lysosomes are also known as Suicidal bags of the cells . [R] :...

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  6. [A] : Chloroplasts contain circular DNA , rRNA , mRNA and are also abl...

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  7. [A] : Mitochondria synthesize energy rich compounds called ATP . [R]...

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  8. [A] : Chloroplasts have 75% chlorophyll a and 25% chlorophyll b [R] ...

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  9. [A] : Peroxisomes occur , both in plants and animals . [R] : They ar...

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  10. [A] : Glyoxysome are present only in plant cells . [R] : They are fo...

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  11. Assertion. The nuclear envelope acts as an interface between the genet...

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  12. [A] : One or many nucleoli are present in a nucleus . [R] :The nucle...

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  13. [A] : Nucleus controls different metabolic as well as hereditary activ...

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  14. [A] : Homeostasis is the maintenance of a stable internal environment ...

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  15. [A] : Usually the cells of animals and plants have controlled growth ....

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  16. [A] : Behavioural activities that are correlated with a one week cycle...

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  17. [A] : Prokaryotic cell shows no cyclosis. [R] : Eukaryotic cell show...

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  18. [A] : No energy can be released in the cell in the absence of mitochon...

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  19. [A] : Nuclear membrane or karyotheca forms an envelope-like structure ...

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  20. [A] : The space between nuclear envelope and nucleolus is filled by ka...

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