Skip to content
Login Register

#lipids

40 public questions tagged with this topic.

ZOOLOGY

Which of the following statements about lipids is incorrect?

Lipids do not contain peptide bonds; these are found in proteins. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Zoology section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Zoology portion (Latest NCERT Textbooks for Academic Session 2026-27 - Rationalized Edition for Class XI and XII), Topic: Structural organization, ph

View Details
ZOOLOGY

Which of the following statements about lipids is correct?

Lipids are hydrophobic and do not dissolve in water. They do not contain nitrogen as a major component or peptide bonds. This follows from NCERT principle where relation explains outcome clearly for students.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function, Topic: Structural organization and physiology.

View Details
ZOOLOGY

Which of the following statements about lipids is correct?

Lipids are hydrophobic and do not dissolve in water. They are not polymers and play structural roles, such as forming ll membranes. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function.

View Details
ZOOLOGY

Which of the following statements about lipids is incorrect?

Lipids do not contain peptide bonds; these are found in proteins. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Zoology section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Zoology portion (Latest NCERT Textbooks for Academic Session 2026-27 - Rationalized Edition for Class XI and XII), Topic: Structural organization, ph

View Details
ZOOLOGY

Which of the following statements about lipids is correct?

Lipids are hydrophobic and do not dissolve in water. They do not contain amino acids or peptide bonds. This follows from NCERT principle where relation explains outcome clearly for students.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function, Topic: Structural organization and physiology.

View Details
ZOOLOGY

Which of the following statements about lipids is correct?

Lipids play a structural role in ll membranes, forming the phospholipid bilayer. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function.

View Details
Plasma Membrane

Which lipid is unique to mitochondria?

Cardiolipin, diphosphatidylglycerol, uniquely contains two phosphatidic acid moieties linked by central glycerol bridge, resulting in four acyl chains, typically tetralinoleoyl 18:2 in cardiac tissue conferring fluidity, and small headgroup with two negative charges at physiological pH. Synthesized in mitochondria by condensation of phosphatidylglycerol and CDP-diacylglycerol catalyzed by cardiolipin synthase CRLS1 on matrix side of inner membrane followed by remodeling via tafazzin transacylase exchanging chains to mature unsaturated form. Its conical shape with large hydrophobic volume impos

Ref: Lehninger Principles of Biochemistry, 8th ed., Chapter 19: Cardiolipin, Mitochondrial Signature Lipid.

View Details
Plasma Membrane

Which of the following is NOT a feature of plasma membrane lipids?

Plasma membrane lipids assemble through non-covalent forces rather than covalent polymerization. Each phospholipid or cholesterol monomer inserts via hydrophobic effect with tails buried together while polar headgroups contact water, stabilized by van der Waals contacts, hydrogen bonding between phosphate oxygens and water, and electrostatic interactions. This allows lateral diffusion, rotation, and exchange between leaflets catalyzed by flippases, and reversible desorption to cytosolic carriers. Membranes exhibit selective permeability because polar headgroup region impedes hydrophobic solute

Ref: Alberts et al., Molecular Biology of the Cell, 7th ed., Chapter 10: Non-Covalent Assembly of Lipids.

View Details
Plasma Membrane

Which of the following lipids is involved in intracellular signaling pathways?

Phosphatidylinositol is quantitatively minor, about 5-8% of total phospholipid, but disproportionately important for intracellular signaling because its inositol ring can be phosphorylated at positions 3, 4, and 5 by dedicated kinases to generate combinatorial phosphoinositide codes. PI 4,5-bisphosphate resides in plasma membrane inner leaflet where phospholipase C, activated by Gq-coupled receptors or receptor tyrosine kinases, hydrolyzes it into two second messengers: diacylglycerol that remains membrane bound to recruit and activate conventional protein kinase C via C1 domain, and inositol

Ref: Lodish et al., Molecular Cell Biology, 9th ed., Chapter 16: Signaling, Phosphoinositide Second Messengers.

View Details
Plasma Membrane

Which type of lipid is found in high concentrations in the myelin sheath of nerve cells?

Myelin ultrastructure demands lipid composition favoring extremely stable insulating multilamellar wraps reducing capacitance increasing resistance for saltatory conduction. Oligodendrocyte Schwann cell myelin contains seventy percent lipid eighty percent dry weight enriched sphingolipids galactosylceramide twenty three percent sulfatide four percent sphingomyelin eight percent plus cholesterol twenty eight percent compared plasma membrane choline phospholipids lower PC ten PE fifteen phosphatidylethanolamine. Sphingomyelin amide linked saturated very long chain fatty acids C22 C24 C26 promote

Ref: Quarles et al., Neurochemical myelin membranes sphingomyelin high concentration, in Basic Neurochemistry 2012.

View Details
Glycolipid and Phospholipid

Which of the following plays a role in blood group antigen formation?

Glycosylation modifications influence ABO antigen presentation beyond core transferase reactions involving fucose GalNAc Gal additions to H substance. Sialic acid N acetylneuraminic acid added ST3GAL ST6GAL1 sialyltransferases using CMP Neu5Ac caps galactose residues precursor polylactosamine chains via alpha two three alpha two six linkages introducing negative charge repelling pathogens masking H antigen lectin binding modulating accessibility and complement regulation. On erythrocyte membrane glycophorin A carries fifteen O linked one N linked sialylated tetrasaccharides accounting major ne

Ref: Varki A., Glycobiology 2008, Sialic acids blood group antigen modulation masking and recognition.

View Details
Glycolipid and Phospholipid

Which characteristic of sterols makes them amphipathic?

Amphipathicity requires coexistence within single molecule hydrophilic region capable electrostatic hydrogen bonding interactions water and hydrophobic region driving entropic exclusion aggregation to minimize hydrocarbon water contact. Sterols satisfy this by small three beta hydroxyl group donating hydrogen bond acting polar anchor positioned near phospholipid glycerol carbonyl interface extracellular leaflet oriented aqueous phase while bulk consists four fused cyclopentanoperhydrophenanthrene rings three six membered one five membered plus branched isooctyl chain eight carbons providing la

Ref: Alberts et al., MBOC 7th ed., Chapter 10: Cholesterol amphipathic structure hydroxyl hydrocarbon explanation.

View Details