Question

D) glycosyltransferases E) carboxypeptidase 26. What type of protein secondary structure is characterized as being highly extensible because of its coiled structure? A B-pleated sheet By double helix a-helix supercoiling local folding 27. The figure above is an example of a: A) Glycerol Sterol - Phospholipid D) Glycolipid E) Sugar 28. Long tails (relative to short fatty acid tails) of lipids that make up plasma membranes increase the viscosity of a plasma membrane due the which of the following? A) Hydrogen bonds B) Peptide bonds Phosphodiester bonds D) Covalent bonds ET Van de Waal interactions o-p 29. While culturing some cells, you lower the temperature of the culture. What happens immediately to the membrane fluidity? A) Nothing happens. ® The membrane becomes less fluid. C) The membrane becomes more fluid. v tem

Answer 1

26. Alpha helix

Secondary structure is formed by the folding of peptide chain upon itself. It is stabilized by hydrogen bonding. There are two types of secondary structures, Alpha helix and beta pleated sheet. Alpha helix is called in a helical manner Where are beta pleated sheet is formed by pleating of two or more strands with one another.

27. Sterol

Sterols are benzene derivatives and are ringed planar structure. They have many rings in their structure.

28. Phosphodiester Bond

Long tail fatty acid help in decreasing membrane fluidity by showing intermolecular interaction.

29. B

Whenever the ambient temperature increases, the fluidity of plasma membrane also increases but if the temperature decreases then the fluidity also decreases. This is because whenever the temperature increases, the phospholipids present in plasma membrane begin to flow with a greater velocity.

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