IRUE or FALSE: Glycerophospholipids are the main storage forms of lipids in anim

Question

IRUE or FALSE: Glycerophospholipids are the main storage forms of lipids in animals. TRUE or FALSE: Most of the steroid hormones are synthesized from fatty aciod TRUE or FALSE: Triacylglycerols are the main structural components of biomembranes. TRU E or FALSE: Biological membranes are composed of a variety of lipids and proteins. TRUE or FALSE: Inner and outer leaflets of the plasma membrane of an animal cell usually have TRUE or FALSE: Transmembrane proteins can be involved in passive transport of nutrients TRUE or FALSE: Plasma membrane is impermeable to water and other small non-polar identical lipid compositions. across the membrane uncharged molecules.

Explanation / Answer

1.   Triglycerides are the main storage form of lipids in animals but not glycerophospholipids. Glycerophospholipids are important components of biological membranes. So, the statement that glycerophospholipids are the main storage forms of lipids in animals is FALSE.
2.   Most of the steroid hormones are synthesized from cholesterol. Cholesterol is a sterol, which is a type of lipid. So, the statement that most of the steroid hormones are synthesized from fatty acids is FALSE.
3.   Triacylglycerols are also known as triglycerides. They are esters of glycerol and three fatty acids. They are the storage form of lipids but they are not the main structural components of biomembranes. Glycerophospholipids are the main components of biomembranes. So, the statement that triacylglycerols are the main structural components of biomembranes is FALSE.
4.   Biological membranes are made of a lipid bilayer that is composed of a variety of lipids like phospholipids, glycolipids, cholesterol and a variety of proteins like glycoproteins, peripheral membrane proteins, integral membrane proteins. So, the statement that biological membranes are composed of a variety of lipids and proteins is TRUE.
5.   The outer and the inner leaflet of the phospholipid bilayer of a biological membrane is asymmetric. The protein and lipid components of the bilayer are distributed unequally between the outer and the inner leaflet. So, the statement that inner and outer leaflets of the plasma membrane of an animal cell usually have identical lipid composition is FALSE.
6.   Transmembrane proteins like channel proteins and carrier proteins transport nutrients across a biological membrane by passive transport mechanism. So, the statement that transmembrane proteins can be involved in passive transport of nutrients across the membrane is TRUE.
7.   Plasma membrane is selectively permeable. Small nonpolar uncharged molecules can freely diffuse across the membrane. Small polar uncharged molecules like water can also cross the cell membrane. However large polar uncharged molecules like glucose and charged molecules like ions cannot diffuse across the cell membrane. So, the statement that plasma membrane is impermeable to water and other small nonpolar uncharged molecules is FALSE.

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