Which of the following is included in the cytoskeleton?

Filaments (thin, thick and intermediate)

Why can the cell membrane not be seen under a light microscope (LM)?

Because it is very thin (7.5-10 nm in thickness).

Because it is not present in cells.

Because it is made of transparent material only.

Because it is destroyed during staining.

The three layers of the cell membrane are called ________, ________, and ________.

outer electron-dense layer, middle electron-lucent layer, inner electron-dense layer

outer protein layer, middle lipid layer, inner protein layer

outer phospholipid layer, middle carbohydrate layer, inner phospholipid layer

outer hydrophilic layer, middle hydrophobic layer, inner hydrophilic layer

The cell membrane is also known as:

Trilaminar or trilamellar or unit membrane

The lipid component of the plasma membrane is formed of:

Phospholipid molecule bilayer (with hydrophilic polar heads and hydrophobic non polar tail)

What is the function of the phospholipid molecule bilayer (with hydrophilic polar heads and hydrophobic non polar tail) in the plasma membrane?

It produces energy for the cell.

Cholesterol molecules (2%) are embedded in the phospholipid bilayer. What is their function?

Stabilizing effect (makes it less fluid)

Which of the following is embedded within the lipid bilayer and not easily removed?

Peripheral proteins (extrinsic)

Where are peripheral proteins (extrinsic) present?

On both the inner and outer surface of the plasma membrane

Only on the inner surface of the plasma membrane

Only on the outer surface of the plasma membrane

Embedded within the lipid bilayer

Which type of protein is labeled as 'Integral membrane proteins'?

Peripheral proteins (extrinsic)

What is the function of cell recognition proteins in the membrane?

Surface proteins serve as identification tags because they occur only in the cells of that individual.

They transport ions across the membrane.

They are responsible for synthesizing ATP.

They provide structural support to the cell membrane.

What is the medical application of cell recognition proteins?

Tissue typing, a procedure performed before an organ from one individual is transplanted into another (organ transplant).

Production of red blood cells in the bone marrow.

Regulation of blood pressure in the circulatory system.

Synthesis of hormones in endocrine glands.

Where is the cell coat (glycocalyx) located?

On the outer surface of the outer leaflet of the plasma membrane

On the inner surface of the inner leaflet of the plasma membrane

The cell

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University

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