Tag: cell membrane and cell wall

Questions Related to cell membrane and cell wall

What is an isotonic solution?

biology the fundamental unit of life introduction to cell what are the living organisms made of organisation of the organism cell membrane and cell wall cell wall cell division in embryo development

  1. A solution whose water concentration is lower than the internal concentration.

  2. A solution whose water concentration is same as compared to internal concentration.

  3. A solution whose water concentration is more than the internal concentration.

  4. None of the above.

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Correct Option: B
Explanation:
  • If both the medium and cell has exactly the same water concentration and thus, there will be no net movement of water across the cell membrane is known as an isotonic solution. 
  • The cells remain of the same size.

    Hence, the correct option is B.

In a hypotonic solution, the cell 

biology the fundamental unit of life introduction to cell what are the living organisms made of organisation of the organism cell membrane and cell wall cell wall cell division in embryo development

  1. Shrinks

  2. Remains of the same size

  3. Swells

  4. All of the above

Show answer
Correct Option: C
Explanation:

Hypotonic solution is a type of solution in which water concentration in the medium is more than the cell. Water crosses the membrane in both directions, but more water will come into the cell than will leave. The net result is that the water enters the cell. The cells will swell up. 

Solution that has a greater concentration of solutes on the outside of a cell when compared with the inside of a cell is a 

biology the fundamental unit of life introduction to cell what are the living organisms made of organisation of the organism cell membrane and cell wall cell wall cell division in embryo development

  1. Hypertonic solution

  2. Isotonic solution

  3. Hypotonic solution

  4. Both A and C

Show answer
Correct Option: A
Explanation:

A hypertonic solution is a particular type of solution that has a greater concentration of solutes on the outside of a cell when compared with the inside of a cell. Water crosses the cell membrane in both directions, but more water leaves the cell than enters it. Therefore, the cell will shrink due to exosmosis.

If a cell is in a hypotonic environment, this means

biology the fundamental unit of life introduction to cell what are the living organisms made of organisation of the organism cell membrane and cell wall cell wall cell division in embryo development

  1. There are fewer solutes inside the cell than in the extra-cellular environment

  2. There is an equal amount of solutes inside as outside the cell

  3. There is more solute outside the cell than in the cell

  4. There is less solute outside the cell than inside of the cell

Show answer
Correct Option: D
Explanation:

A hypotonic environment is when the solute concentration outside the cell is less than inside the cell.

When both the regions have the same solute concentration it is an isotonic environment.
When the solute concentration outside the cell is higher than inside the cell then it is in a hypertonic environment.
So the correct answer is 'There is less solute outside the cell than inside the cell'.

Roots will absorb water when external medium will be

biology the fundamental unit of life introduction to cell what are the living organisms made of organisation of the organism cell membrane and cell wall cell wall cell division in embryo development

  1. Hypotonic

  2. Hypertonic

  3. Isotonic

  4. Concentrated

Show answer
Correct Option: A
Explanation:

Osmosis happens along a concentration gradient. If outside medium is hypotonic, it means that relatively more of water is present outside the cells in the surrounding medium and water will flow inside the root hair cells.

Cell cycle was divided into  four stages i.e. G$ _1$, S, G$ _2$, M by

biology division for growth and reproduction cell membrane and cell wall cell wall cell division in embryo development structure of chromosome, cell cycle and cell division component of the cell different types of reproduction reproductive health of humans need of family planning tissues of animals mitosis reproductive health

  1. W. Flemming

  2. Strass burger

  3. Howard and Pelc

  4. Farmer

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Correct Option: C
Explanation:

Howard and Pelc divided cell cycle in four stage. The cell cycle is an ordered set of events, culminating in cell growth and division into two daughter cells. Non-dividing cells not considered to be in the cell cycle. The stages  are G$ _1$-S-G$ _2$-M. The G$ _1$ stage stands for "GAP 1". The S stage stands for "Synthesis". This is the stage when DNA replication occurs. The G$ _2$ stage stands for "GAP 2". The M stage stands for "mitosis", and is when and cytoplasmic division occur.

Match the following.

Column I Column II
A. Bacteria 1. Synthesis and storage of lipids
B. Sphaerosomes   2. Idiogram
C. Chloroplasts 3. Glycocalyx
D. Karyotype 4. Thylakoids

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  1. A-3, B-2, C-4, D-1

  2. A-3, B-1, C-2, D-4

  3. A-4, B-3, C-2, D-1

  4. A-1, B-2, C-3, D-4

  5. A-3, B-1, C-4, D-2

Show answer
Correct Option: E
Explanation:

Sphaerosomes are single half unit membrane covered small spherical organelles which synthesize and store fats. The cell wall of bacteria is made up of glycocalyx (carbohydrate and amino acids). Chloroplasts are eukaryotic plant cell organelles which have an internal thylakoid membrane system. The thylakoid membranes carry out the light reactions part of photosynthesis. The chromosomes of a eukaryotic cells are called its karyotype. The diagrammatic representation of a cells karyotype is called an idiogram.

The cell wall of certain fungi is made of:

biology cell biology cell membrane and cell wall cell wall cell division in embryo development

  1. Lignin

  2. Suberin

  3. Chitin

  4. Pectin

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Correct Option: A,C

During breakdown of lecithin which of the following is not obtained?

biology cell and cell organelles cell membrane and cell wall cell wall cell division in embryo development

  1. Trihydroxy propane

  2. Fatty acid

  3. Choline

  4. Sphingosine

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Correct Option: A
Explanation:
  • Lecithin is also known as phosphatidylcholine (a group of phospholipids) which are important for maintaining the cell structure and metabolism.
  • Lecithins are composed of phosphoric acid, choline, esters of glycerol and two fatty acids. 
  • Thus, during the breakdown of lecithin fatty acid, choline and sphingosine are obtained.
  • So the correct answer is 'Trihydroxy propane'.

Organelles that are surrounded by two membranes are-

biology cell and cell organelles cell membrane and cell wall cell wall cell division in embryo development

  1. Nucleus and mitochondria.

  2. Nucleus and Golgi bodies.

  3. Endoplasmic reticulum and Lysosomes.

  4. Endoplasmic reticulum and Mitochondria.

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Correct Option: A