Which of the following proteins is on the surface of viruses and play an important role in allowing the virus to recognize and bind to the host cell?
a D and B coat proteins
b C and G coat proteins
c H and N coat proteins
d P and T coat proteins

c is the answer : )               your welcome

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.