<span> - </span><span>A typical meal contains </span>all four<span> types of </span>macromolecules<span>. </span>Living things<span> are made of </span>four<span>types of molecules, known as </span>macromolecules<span>: ... Highly specialized at what </span>they<span> do, proteins form both the railways and the motors that ... it exists as a single strand and </span>has<span> a special building block not</span>found<span> in DNA.</span>
Each sieve tube element is normally associated with one or more nucleated companion cells, to which they are connected by plasnodesmata (channels between the cells). Each companion cell is derived from the same mother cell as its associated sieve tube member. Sieve tube members have no cell nucleus, ribosomes, or vacues. Thus, they depend on companion cells to provide proteins, ATP, and signalling molecules
Displacement is usually the method that is used to measure the volume of a solid with an irregular shape
