Tag: microscopy
Questions Related to microscopy
Cause of chromosome laggards in meiosis is?
-
Inversion
-
Dicentric chromosome
-
Acentric chromosome
-
Duplication of a gene
What are the spindle fibres that connect the centromere of chromosome to the respective poles called?
-
Astral rays
-
Interpolar fibres
-
Chromosomal fibres
-
Inter chromosomal fibres
Which of the following is not the function of a vacuole?
-
Storage
-
Providing turbility and rigidity to the cell
-
Waste excretion
-
Locomotion
The vacuole are the membranous vesicular structures in the cells of the living organisms. The vacuoles are involved in the storage of the food materials. The presence of vacuole provides rigidity and shape to the cell with the help of turbulence. The wastes from the cells can be excreted with the help and movement of the vacuoles. The vacuoles are not responsible for locomotion.
When a fresh water protozan is placed in marine water
-
The contractile vacuole disappears
-
The contractile vacuole increases in size
-
A number of contractile vacuoles appear
-
The contractile vacuole remains unchanged
Contractile vacuoles are membrane-bound organelles that pump excess water out of the protozoan. When the freshwater protozoan is placed in a marine environment it loses water due to exosmosis as salt concentration is high outside. The contractile vacuole disappears to prevent the loss of water from the organism because in the presence of contractile vacuoles the cell will be dehydrated.
Spindle chromosomes have
-
Centriole
-
Kinetochore
-
Chromocentre
-
Chromomere
Chromosomes when attached to spindle fibres are called as spindle chromosomes. These Chromosomes have narrow very lightly coloured centromere or primary constriction. The centromere has a proteinaceous covering called as kinetochore on the two free surface of the centromere complex. The kinetochore has centromere binding proteins.
Vacuoles are formed by the fusion of
-
Cytoplasm
-
Golgi apparatus
-
Vesicles
-
None of the above
Vacuoles are the membrane-bound storage organelle formed by the fusion of multiple membrane vesicles. It does not have fixed shape and varies according to the need.
Outermost layer surrounding the vacuole is
-
Tonoplast
-
Vacuolar Membrane
-
Both A and B
-
Vacuolar cell wall
A vacuole is the double membrane bound structure. The outermost covering of vacuole is called as tonoplast or vacuolar membrane. The tonoplast is the cytoplasmic membrane separating the vacuolar contents from the cell's cytoplasm. Therefore, the correct answer is option C.
Which out of the following is not a function of vacuole?
-
Storage
-
Providing turgidity and rigidity to the cell
-
Waste excretion
-
Locomotion
The vacuole is the membrane bound cell organelle and has the main function of osmoregulation. It also stores fluid and solid and hence, maintains rigidity of cell. In some organism vacuole involves in the excretion of wastes. Thus, the correct answer is option D.
'Storage sac of the cell' is ___________________
-
Ribosome
-
Chloroplast
-
Vacuole
-
Golgi body
Vacuoles are the membrane-bound organelle filled with water containing inorganic and organic molecules including. In-plant cells, it is large and centrally located whereas, in animal cells, it is either small or absent. It is also called as storage sac as it stores water, food and waste materials.
So, the correct answer is option C.
Which one of the following is not the function of a vacuole?
-
Storage
-
Providing turgidity and rigidity to the cell
-
Waste excretion
-
Locomotion