Questions
Macula adherins is a modification of
- endoplasmic reticulum
- nuclear membrane
- cell wall
- desmosomes
Assertion: Plasmolysis is the physical phenomenon that can be employed to visualise cell wall and cell membrane distinctively.
Reason: When placed in a hypertonic solution, the cell membrane is constricted due to heavy loss of water owing to the physical phenomenon of osmosis.
- Assertion and Reason both are correct and Reason is the correct explanation of Assertion.
- Assertion and Reason both are correct and Reason is NOT the correct explanation of Assertion.
- Assertion is correct but Reason is wrong.
- Assertion and Reason both are incorrect.
Which of the following observations most strongly supports the view that mitochondrial membranes have Electron Transport System (ETS) enzymes?
- Mitochondria have a property to concentrate in the locomotive cells.
- Mitochondria have a folded inner membrane structure.
- Disruption of mitochondrial membrane yields out fragments that are able to synthesise ATP.
- A contractile protein capable of utilising ATP is obtained from mitochondria.
“Intussusception” is a well-known physical property of primary cell wall. It is characterised as
- hardening of cell wall
- deposition of cell wall material from outside as layers
- deposition of cell wall material from inside to cause growth
- None of these
Cell membranes are dynamic structures constituted of various biochemical entities. Many models have been proposed for defining the structure and constitution of membranes. The most accepted of these is the Singer and Nicholsons’ fluid mosaic model. Based on the knowledge of Singer and Nicholsons’ model, answer the following:
Which of the following biochemical moieties are proposed to be biological constituents of plasma membrane?
- Glycoproteins and glycolipids
- Phospholipids and chitin
- Proteins, lipids, carbohydrates and their collaborative derivates
- All of the above
Choose the odd one out acknowledging the cell membrane's properties.
- Nucleus
- Mitochondria
- Chloroplast
- Lysosomes
Animal Cell and Plant Cells differ in their cytology is a well-known fact. The following two questions need to be answered based on the clarity of the cell doctrine and cellular function.
Who suggested the cytological difference between a plant cell and an animal cell?
- Schleiden: Plant cells have cell wall.
- Schleiden and Schwann: The cell theory suggests the difference.
- Schwann: Animal cells do not have a cell wall.
- Virchow: Plant cells have cell wall.
Cell membranes are dynamic structures constituted of various biochemical entities. Many models have been proposed for defining the structure and constitution of membranes. The most accepted of these is the Singer and Nicholsons’ fluid mosaic model. Based on the knowledge of Singer and Nicholsons’ model, answer the following:
Which of the following statements justifies the correct biochemistry profile of the plasma membrane with respect to individual constituents?
- Lipids are in the least proportion, while carbohydrates and proteins are slightly higher but in equal proportions.
- Proteins are in the least proportion, while carbohydrates are slightly higher and lipids are the most abundant of all.
- All the three are in equal proportions.
- Carbohydrates are in the least proportion, while proteins are slightly higher and lipids are the most abundant of all.
Plasma membranes are the interface of the cell. Therefore, they have some specialised components that take care of the recognition and identification. The recognition responsibility of the plasma membrane lies with
- protein portion of glycoproteins
- carbohydrate portion of glycoproteins
- Both protein and carbohydrate portions of glycoproteins
- Sphingosine region of sphingolipids
Cells that line the inner and outer surfaces of organs or body cavities are often linked together by intimate physical connections known as
- tonofilaments
- fascia adherens
- tight junctions
- septate desmosomes
In regular molecular laboratory procedures, “Binding Membranes” are used for blotting assays. The analogy of such membranes in an animal cell is
- unit membrane
- biological membrane
- plasma membrane
- cell coat
The inner membrane of mitochondria is highly selective to what it allows to enter the organelle. But one of the following molecules is regularly allowed to enter. Choose the correct one.
- ATP
- Citric acid
- Glucose
- Pyruvic acid
Animal Cell and Plant Cells differ in their cytology is a well-known fact. The following two questions need to be answered based on the clarity of the cell doctrine and cellular function.
Which of the following options quotes the main difference between a dividing plant cell and an animal cell?
- Type of spindle formation
- Coiling of chromosome
- Chromosome movement
- Cell plate formation
There exist varied membrane systems in the cellular systems, but one unique system is the “Endomembrane System” in which there exists a contiguous plasma membrane. Which of the following pair of organelles in the endomembrane system shares their membranes?
- Endoplasmic reticulum and Golgi apparatus
- Nucleus and Endoplasmic reticulum
- Nuclear pore and Ribosomes
- Golgi apparatus and Lysosomes
The action potential in the nerve impulse results from
- decrease in -ve charge inside the nerve fibre
- increase in +ve charge outside the nerve fibre
- opening of voltage gated Na+ channels
- activation of Na-K pump