Final answer:
Lyctid beetles do not infest softwood due to a lack of protein; softwoods do not provide the necessary nutrients for their larvae. Viruses lack ribosomes and metabolic processes but contain nucleic acids and glycoproteins.
Step-by-step explanation:
Lyctid beetles are unable to infest softwood because they lack protein in their diet, not because of the absence of pores or moisture.
Softwoods generally do not have sufficient protein content to support the development of lyctid beetle larvae, which is why these beetles typically infest hardwoods, which have higher levels of proteins in the form of starches, cellulose, and other nutrients.
Regarding the question about viruses, viruses lack several components that are common in living cells. Specifically, viruses lack ribosomes and metabolic processes.
Viruses do contain nucleic acids, which can be either DNA or RNA, and they often have glycoproteins on their surfaces, which help them attach to host cells. Therefore, the correct selections that apply to what viruses lack are A (ribosomes) and B (metabolic processes).