BSC2010 Study Guide - Chemical Formula, Double Bond, Covalent Bond

                                           Figure 2.24

Which of the following statements is false?

a. Molecules with the formulas CH₃CH₂COOH and C₃H₆O₂ could be structural isomers.

b. Molecules must have a double bond to be cis-trans isomers.

c. To be enantiomers, a molecule must have at least three different atoms or groups connected to a central carbon.

d. To be enantiomers, a molecule must have at least four different atoms or groups connected to a central carbon.

The properties of a lipid bilayer are determined by the structures of its lipid molecules. If the following were true, would you predict the membrane to be more fluid, less fluid, or the same fluidity as a normal membrane? Provide a brief explanation for each answer

A) The hydrocarbon chains were longer than normal, ~24 carbon atoms long

B) An extra C=C double bond were introduced to every tailgroup

C) Each lipid’s molecules two tailgroups were covalently liked to each other

The structure of a lipid bilayer is determined by the properties of its lipid molecules. Predict the effect on the membrane fluidity of the following alterations:

a. Phospholipids have only one hydrocarbon chain instead of two...

b. The hydrocarbon chains were shorter than normal, about 10 carbon atoms long?

c. All of the hydrocarbon chains are saturated?