what is the number of cases in the world of marfan syndrome

Which of these is not a function of some membrane proteins ? a.allowing polar molecules to enter the cell b.recognizing other types of cells c.receiving messeges from other cells b.carrying messages to oher cells

Based on the diagram, which of the following best describes ways in which the physical appearance of h. neandertalensis and h. sapiens differ?

Which enzyme is responsible for “unzipping" the dna by breaking the hydrogen bonds between the nucleotides?