Exam 9: Lipids and Biological Membranes

The signal peptide sequence (I)is often used to direct proteins to the lysosome for incorporation into the lysosome. (II)is usually not used for small eukaryotic proteins. (III)of some transmembrane proteins is embedded into the membrane as an anchor. (IV)is usually cleaved off the completed protein.

Use the diagram below to answer the following question.The enzyme flipase would catalyze which of the following types of reactions?

Matching -Glycosphingolipids with complex carbohydrate head groups that often serve as cellular receptors are ______.

Adipocytes

Which of the structures below is an example of an $\omega$ -3 polyunsaturated fatty acid?

Glycosphingolipids with several attached carbohydrates (including at least one sialic acid)are called:

Matching -______ are the lipids that are most abundant even though they are not components of membranes.

Which of the following statements are true regarding fatty acids? (I)Fatty acids with fewer than 14 carbons are the most common. (II)Synthesis of fatty acids occurs in 2 carbon units. (III)Fatty acids with conjugated double bonds are the most common type of fatty acid. IV)In higher plants and animals,C₁₆ and C₁₈ species predominate.

Unsaturated fatty acids:

A researcher has designed a new drug that will block the release of certain neurotransmitters from the synaptic cleft.Which of the following reactions must be blocked by this new drug?

Triglycerides contain more metabolic energy per unit weight than glycogen because: (I)Glycogen has greater polarity than fatty acids. (II)Fatty acids predominate in an anhydrous form (III)Fatty acids are less oxidized than carbohydrates. (IV)Triglycerides have a higher average molecular mass.

Which of the following is true about membrane proteins embedded within the lipid bilayer?

Matching -Members of the ______ family have four fused,nonplanar rings and a C3-OH group.

The _________ model describes the cell membrane as an assortment of integral proteins suspended freely in a lipid bilayer.

Proteins which are passed from one Golgi compartment to the next in a successive fashion do so via a mechanism called____.

Matching -They ______ are a class of amphipathic molecules that comprise the major lipid components of the cell membrane.

Matching -A derivative of______ is the major lipid in lung surfactant.

Which would be most likely to be found in the membranes of mouse brain cells?

Which of the following is comprised primarily of fatty acids and other single tailed amphiphiles?

Which of the following processes presented in this chapter is (are)readily reversible with the help of enzymes known as thioesterases?