AP BIOLOGY

Detailed explanation-1: -Single chains of amino acids that are the units of multimeric PROTEINS. Multimeric proteins can be composed of identical or non-identical subunits. One or more monomeric subunits may compose a protomer which itself is a subunit structure of a larger assembly.

Detailed explanation-2: -Proteins are composed of hundreds or thousands of subunits (building blocks) called amino acids that are linked together in long chains. Twenty types of amino acids are combined to form proteins. Based on the sequence of its amino acids, each protein has a unique three-dimensional shape and purpose.

Detailed explanation-3: -Protein Structure and Function The most common number of subunits is either 2 (dimer) or 4 (tetramer), but trimers, pentamers, and hexadecamers and higher order structures also occur.

Detailed explanation-4: -All of the subunits are essential for life and for RNase P activity. Of the nine protein subunits, seven of the proteins are highly basic with isoelectric points (pI) greater than 9, Pop8p is the only acidic protein with a pI of 4.5, whereas Pop5p has a pI of 7.7.