What is the role of the helicase enzyme in dna replication? a) it breaks apart the bases b) it adds nucleotide to the chain c) it checks the dna for errors d) it ties the chunks of dna together me with this question asap

Molecules like glucose and amino acids are not lipid soluble, so cannot cross the cell membrane by simple diffusion. instead, they are shuttled across by carrier proteins in the membrane from high to low concentration. does this process require energy from the cell? this is an example of what type of molecular movement?