Cell Membrane

Q.

What are the disadvantages of O-negative blood?

Q.

What is mesosome? Where it is located? What are its main uses?

Q. Which of the following are non-membrane bound organelles?

1. Ribosomes
2. Nucleolus
3. Centrosome
4. All of these

Q.

According to the unit membrane concept (Robertson model), the plasma membrane has the following arrangement:

1. Protein and lipid layers intermingled

2. Protein-lipid-protein

3. Lipid-protein-lipid

4. Protein-lipid-lipid

Q.

Draw a well-labeled diagram of the nucleus.

Q.

What are examples of transport proteins?

Q.

The process of plasmolysis in plant cells is defined as:

1. Breakdown of plasma membrane in hypotonic solution

2. Shrinkage of cytoplasm in hypertonic medium

3. Shrinkage of nucleoplasm

4. None of these

Q. The fluidity of membranes in a plant in cold weather may be maintained by

1. increasing the number of phospholipids unsaturated hydrocarbon tails
2. increasing the proportion of intergral proteins
3. increasing concentration of cholesterol in membrane
4. increasing the number of phospholipids with saturated hydrocarbon tails

Q.

Differentiate between the following:

1. Turgidity and Flaccidity

Q.

What is the cell membrane composed of?

Q. Given below is a table. Fill in the gaps

Property	Simple diffusion	Facilitated transpor	Active Transport
i. Highly selective		Yes
ii.Uphill transport			Yes
iii. Requires ATP

Q. A cell observed under a microscope has circular DNA, 70S ribosomes, and chromatophores. The observed cell is

1. plant cell
2. cyanobacterial cell
3. mycoplasma cell
4. protist cell

Q. Which pair of structure are usually found in both plant and animal cells?

1. Cells membrane and nucleolus
2. Cell membrane and cell wall
3. Nucleolus and chloroplast
4. Nucleus and cell wall

Q. Read the assertion and reason carefully to mark the correct option in question.

Assertion: Interphase nucleus has a loose and distinct network of fibre called chromatin.

Reason: Chromatin contains $RNA,DNA$ and histone proteins but non-histone proteins are absent.

1. If both assertion and reason are true but the reason is not the correct explanation of the assertion.
2. If both assertion and reason are false.
3. If assertion is true but the reason is false.
4. If both assertion and reason are true and the reason is the correct explanation of the assertion.

Q. The plasma without fibrinogen and other clotting factors is called:

1. Blood
2. Serum
3. Anti-serum
4. Lymph

Q. What is cytoplasmic streeming?

Q. Differentiate between plasma membrane and cell wall.

Q.

What are the main functions of nuclear membrane?

Q.

Which part of the cell contains cell organelles?

Q. How does water move within the root?

Q. The net direction and rate of osmosis depends on both the pressure gradient and concentration gradient

1. True

2. False

Q. Does boiled potato have dead cells? Does osmosis occur in that boiled one, if it doesn't please explain me why and how

Q. Which of the following statements is incorrect regarding the cell membrane?

1. The fluid mosaic model was proposed to explain the structure of the plasma membrane
2. Lipids are arranged in a bilayer with hydrophobic heads facing outside and hydrophilic tails towards inside
3. Proteins are embedded within the lipid layer
4. The plasma membrane allows only certain molecules to pass through it

Q.

With a neat labeled diagram describe the structure of an animal cell.

Q. Plasma membrane is made up of two layers of and the protein molecules are embedded in it.

1. lipids
2. carbohydrates
3. cytoplasm
4. ribosomes
5. lysosomes

Q. Read the assertion and reason carefully to mark the correct option in question.

Assertion: The nuclear pores are the passages through which movement of $RNA$ and protein molecules takes place in both directions between the cytoplasm and nucleoplasm.

Reason: Nuclear pores are formed by the fusion of two membranes of the nucleus.

1. If both assertion and reason are true and the reason is the correct explanation of the assertion.
2. If both assertion and reason are false.
3. If both assertion and reason are true but the reason is not the correct explanation of the assertion.
4. If assertion is true but the reason is false.

Q. Which of the following layer is present nearest of plasma membrane in plant cell?

1. Secondary wall
2. Middle wall
3. Primary wall
4. Tonoplast

Q. Name the different cell junctions found in tissues.

Q. According to the widely accepted theory "the fluid mosaic model", cell membranes are semi-fluid, where lipids and integral proteins can diffuse randomly. In recent years, this model has been modified in several aspects. In this regard, which of the following statements is incorrect?

1. Proteins in cell membranes can travel within the lipid bilayer
2. Proteins can also undergo flip-flop movements in the lipid bilayer
3. Proteins can remain confined within certain domains of the membranes
4. Many proteins remain completely embedded within the lipid bilayer

Q. The cell organelle not bound by a membrane is

1. Mitochondria
2. Sphaerosome
3. Ribosome
4. Chloroplast