Amicrobiologist obtained two pure biological samples: one of a virus, and the other of a viroid. unfortunately, the labels had been lost. the microbiologist felt she could distinguish the two by analyzing for the presence or absence of a single molecule. what molecule would she search for and why?

The researcher could look for the presence of proteins, because viruses have a envelope (capsid) composed of proteins that involve their genetic material. The capsid may have a helical or icosahedral structure and is extremely regular. Viroids cannot synthesize any type of protein, so differentiation is possible.

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

the fossil record provides evidence of a common ancestor to many species.