Indicate Whether Each of the Following Descriptions Better Applies to Cellulose

Short Answer

Indicate whether each of the following descriptions better applies to cellulose microfibrils (C) or pectins (P) in plant cell walls. Your answer would be a five-letter string composed of letters C and P only, e.g. CPPPP.
( ) It is made into a network by cross-linking glycans.
( ) It is particularly abundant in the middle lamella.
( ) Divalent ions such as calcium can cross-link it to form gels.
( ) It forms more homogeneous polymers.
( ) It contains many negatively charged galacturonic acid units.