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Metabolism and Bioenergetics

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Number of Questions: 15
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Macula adherins is a modification of

  1. endoplasmic reticulum

  2. nuclear membrane

  3. cell wall

  4. desmosomes


Correct Option: D
Explanation:

Macula adherins is another name for 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.

  1. Assertion and Reason both are correct and Reason is the correct explanation of Assertion.

  2. Assertion and Reason both are correct and Reason is NOT the correct explanation of Assertion.

  3. Assertion is correct but Reason is wrong.

  4. Assertion and Reason both are incorrect.


Correct Option: A
Explanation:

Plasmolysis leads to contraction of cytoplasm away from the plasma membrane, which further induces membrane to contract and thus, increasing the gap between cell membrane and cell wall of a plant cell. This makes both the structures distinctively visible. Plasmolysis is a result of osmosis as it occurs when a plant cell is placed in hypertonic solution.  

Which of the following observations most strongly supports the view that mitochondrial membranes have Electron Transport System (ETS) enzymes?

  1. Mitochondria have a property to concentrate in the locomotive cells.

  2. Mitochondria have a folded inner membrane structure.

  3. Disruption of mitochondrial membrane yields out fragments that are able to synthesise ATP.

  4. A contractile protein capable of utilising ATP is obtained from mitochondria.


Correct Option: C
Explanation:

If fragments of the mitochondrial membranes are able to synthesise ATP, it is proved that the ATP synthesising enzymes are localised in the inter-membranous space. ATP synthesis is achieved only by the path of Electron Transport Chain, so the enzymes involved in the chain are bound to be located in there.

“Intussusception” is a well-known physical property of primary cell wall. It is characterised as

  1. hardening of cell wall

  2. deposition of cell wall material from outside as layers

  3. deposition of cell wall material from inside to cause growth

  4. None of these


Correct Option: C
Explanation:

Intussusception is the the expansion of the cell wall in plants as a result of the introduction of new molecules of cellulose and protopectin into the already formed wall. Instussusception is a well-known term as a medical condition of instestines where a part of the intestine has invaginated into another section of intestine, similar to the way in which the parts of a collapsible telescope slide into one another.

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?

  1. Glycoproteins and glycolipids

  2. Phospholipids and chitin

  3. Proteins, lipids, carbohydrates and their collaborative derivates

  4. All of the above


Correct Option: C

Choose the odd one out acknowledging the cell membrane's properties.

  1. Nucleus

  2. Mitochondria

  3. Chloroplast

  4. Lysosomes


Correct Option: D
Explanation:

Lysosomes are the cell's waste disposal system and are single-membraned, while all the other given organelles are double-membraned.

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?

  1. Schleiden: Plant cells have cell wall.

  2. Schleiden and Schwann: The cell theory suggests the difference.

  3. Schwann: Animal cells do not have a cell wall.

  4. Virchow: Plant cells have cell wall.


Correct Option: C
Explanation:

It was Mathias Schwann who brought out the difference between the plant cell and animal cell based on the microscopic observation of plant cells provided by Schleiden. Schwann, Schleiden and Virchow are the three contributors of The Cell Theory. Schleiden was a botanist and did not observe animal cells. Virchow contributed with his famous doctrine of “omnis cellula e cellula- Cells originate from existing cells”. Schwann experimented both with animal as well as plant cells and marked the difference as “Animal cells do not have a cell wall”. The division cycle of both the animal and plant cells proceeds through same cycles, except for the cytokinesis where plant cells have a special structure formed known as cell plate, which will later become the 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?

  1. Lipids are in the least proportion, while carbohydrates and proteins are slightly higher but in equal proportions.

  2. Proteins are in the least proportion, while carbohydrates are slightly higher and lipids are the most abundant of all.

  3. All the three are in equal proportions.

  4. Carbohydrates are in the least proportion, while proteins are slightly higher and lipids are the most abundant of all.


Correct Option: D
Explanation:

Fluid mosaic model proposed that plasma membrane comprises of a phospholipid bilayer with extrinsic and intrinsic proteins embedded into it along with protein channels. Apart from these, glycolipids and glycoproteins, though present minutely, form the antennae-like structures to assist in recognition and identification.  

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

  1. protein portion of glycoproteins

  2. carbohydrate portion of glycoproteins

  3. Both protein and carbohydrate portions of glycoproteins

  4. Sphingosine region of sphingolipids


Correct Option: B
Explanation:

Carbohydrates are the sole biochemical structures which are employed for recognition or identification purpose in biological systems, be it Lectins for adhesions or blood group typing. The whole field of glycobiology deals with carbohydrates and their properties.

Cells that line the inner and outer surfaces of organs or body cavities are often linked together by intimate physical connections known as

  1. tonofilaments

  2. fascia adherens

  3. tight junctions

  4. septate desmosomes


Correct Option: C
Explanation:

By definition of tight junctions

In regular molecular laboratory procedures, “Binding Membranes” are used for blotting assays. The analogy of such membranes in an animal cell is

  1. unit membrane

  2. biological membrane

  3. plasma membrane

  4. cell coat


Correct Option: C
Explanation:

Binding Membranes are uniform, paper thin, white plastic supports, having specially designed porous structure and binding sites suitable for transfer and hybridisation of biological molecules. Plasma membranes amongst the given options suits the best characteristics of binding membranes, especially the selective permeability and holding capacity.

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.

  1. ATP

  2. Citric acid

  3. Glucose

  4. Pyruvic acid


Correct Option: D
Explanation:

Intake of pyruvic acid in mitochondria is highly passive owing to its demand as a substrate for energy cycles taking place inside the mitochondrial matrix and inter-membranous space.

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?

  1. Type of spindle formation

  2. Coiling of chromosome

  3. Chromosome movement

  4. Cell plate formation


Correct Option: D
Explanation:

It was Mathias Schwann who brought out the difference between the plant cell and animal cell based on the microscopic observation of plant cells provided by Schleiden. Schwann, Schleiden and Virchow are the three contributors of The Cell Theory. Schleiden was a botanist and did not observe animal cells. Virchow contributed with his famous doctrine of “omnis cellula e cellula- Cells originate from existing cells”. Schwann experimented both with animal as well as plant cells and marked the difference as “Animal cells do not have a cell wall”. The division cycle of both the animal and plant cells proceeds through same cycles, except for the cytokinesis where plant cells have a special structure formed known as cell plate, which will later become the cell wall. 

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?

  1. Endoplasmic reticulum and Golgi apparatus

  2. Nucleus and Endoplasmic reticulum

  3. Nuclear pore and Ribosomes

  4. Golgi apparatus and Lysosomes


Correct Option: B
Explanation:

In the entire membrane system, endomembrane system comprises of organellar transport from nucleus to vesicles and finally to plasma membrane wherein the cell membranes of the nucleus and adjacent Rough ER are contiguous and ER contributes more than half percent of the total plasma membrane of the cell.

The action potential in the nerve impulse results from

  1. decrease in -ve charge inside the nerve fibre

  2. increase in +ve charge outside the nerve fibre

  3. opening of voltage gated Na+ channels

  4. activation of Na-K pump


Correct Option: C
Explanation:

Action potential is a short-lived fluctuation in membrane potential of the plasma membrane, which is caused by the opening of the voltage gated ion channels that actively moves the ions across the membrane causing the potential difference.

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