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What is a phospholipid, and what is its function?

Important Questions on Molecular Biology

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Biology>Genetics and Evolution>Molecular Biology>Carbohydrates and Lipids
Proteins P, Q, and R are associated with an intact organellar membrane in a cell. If the intact organelle is treated with a high ionic strength buffer, only protein R remained associated with the membrane fraction. Based on this, one could conclude that:
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Biology>Genetics and Evolution>Molecular Biology>Carbohydrates and Lipids
Which of the following statements is incorrect regarding biological membrane?
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Biology>Genetics and Evolution>Molecular Biology>Carbohydrates and Lipids
At physiological temperature, sterols in biological membranes:
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Biology>Genetics and Evolution>Molecular Biology>Carbohydrates and Lipids
Match the following lists.
  List-I   List-II
(A) Glycerol (I) Phospholipid
(B) Aromatic amino acid (II) Lower melting point
(C) Lecithin (III) Trihydroxypropane
(D) Gingelly oil (IV) Tryptophan
The correct match is:
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Biology>Genetics and Evolution>Molecular Biology>Carbohydrates and Lipids

Following are the statements with reference to 'lipids'.
(a) Lipids having only single bonds are called unsaturated fatty acids.
(b) Lecithin is a phospholipid.
(c) Trihydroxy propane is glycerol.
(d) Palmitic acid has 20 carbon atoms including carboxyl carbon.
(e) Arachidonic acid has 16 carbon atoms.

Choose the correct answer from the options given below.

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Biology>Genetics and Evolution>Molecular Biology>Carbohydrates and Lipids
Phospholipids are formed by the esterification of:
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Biology>Genetics and Evolution>Molecular Biology>Carbohydrates and Lipids
Select the incorrect statements from the following
I) In plasma membrane, hydrophilic polar heads of lipids arrange towards the outside and the hydrophobic tail towards the inner side
II) In the plasma membrane, peripheral proteins lie on the surface of the membrane while the integrated proteins are not buried in the membrane
III) Neutral solutes may move across the membrane by the process of simple diffusion against the concentration gradient
IV) Polar molecules can pass through the non-polar lipid bilayer and do not require a carrier protein
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Biology>Genetics and Evolution>Molecular Biology>Carbohydrates and Lipids
In beetroot, if kept in cold water, anthocyanin does not come out of the plasma membrane as it is
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Biology>Genetics and Evolution>Molecular Biology>Carbohydrates and Lipids
Find the correct statement about the plasma membrane.
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Biology>Genetics and Evolution>Molecular Biology>Carbohydrates and Lipids
That the cell membrane is selectively permeable can be best deduced by
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Biology>Genetics and Evolution>Molecular Biology>Carbohydrates and Lipids
Describe the fluid mosaic model of plasma membrane.
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Biology>Genetics and Evolution>Molecular Biology>Carbohydrates and Lipids
The fluidity of membranes in a plant in cold weather may be maintained by
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Biology>Genetics and Evolution>Molecular Biology>Carbohydrates and Lipids
Keeping has viewed the structure of the cell membrane, which one of the following statements is correct with respect to the movements of liquid and proteins from one liquid monolayer to the other (flip flop movement).
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Biology>Genetics and Evolution>Molecular Biology>Carbohydrates and Lipids
Which of the following four cell structures is correctly matched with the accompanying description?
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Biology>Genetics and Evolution>Molecular Biology>Carbohydrates and Lipids

Represent the union of two sets by Venn diagram for each of the following.

X={x | x is a prime number between 80 and 100}

Y={y | y is an odd number between 90 and 100}

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Biology>Genetics and Evolution>Molecular Biology>Carbohydrates and Lipids
Parchment paper is
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Biology>Genetics and Evolution>Molecular Biology>Carbohydrates and Lipids
Man and mouse cells are treated with red and green fluorescent dyes separately and are made to fuse. The resultant cells when kept at 37°C, the distribution of dye on the surface of cell will be a shown below
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Biology>Genetics and Evolution>Molecular Biology>Carbohydrates and Lipids
Which of the following is characteristic of phospholipids of plasma membrane?
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Biology>Genetics and Evolution>Molecular Biology>Carbohydrates and Lipids
Read the following statements carefully:-

(A) The lipid component of the plasma membrane mainly consists of phosphoglycerides.
(B) Polar molecules can pass through the lipid bilayer of the plasma membrane, therefore they do not require carrier proteins to facilitate their transport.
(C) The secondary wall is capable of growth and it is formed on the outer side of the primary wall.
(D) Quasifluid nature of lipid enables the lateral movement of proteins within the overall lipid bilayer of the plasma membrane.
(E) Middle lamella glues the different neighbouring cells together.

How many statements are incorrect?
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Biology>Genetics and Evolution>Molecular Biology>Carbohydrates and Lipids
Which one statement regarding plasma membrane is correct?