One of the most unusual aspects of virus particles is the absence of all organelles and other smaller structures. whereas cells have many kinds of organelles, viruses consist of only two parts: a nucleic acid core made of dna or rna, and a tough, potective protein shell. which name is given to this tough shell made of protein?

Cells a and b are the same size and shape, but cell a is metabolically quiet and cell b is actively consuming oxygen. oxygen will diffuse more quickly into cell because . b the oxygen molecules inside cell b have a higher kinetic energy b. a its membrane transport proteins will not be saturated c. a the diffusion gradient there is shallowerd. b the diffusion gradient there is steeper