How is dna copied in semi-conservative replication?

the original dna molecule is the template for the new dna molecules.

two new dna molecules form and the original dna molecule dissolves.

the original dna molecule is replaced by a complementary dna molecule.

two dna molecules exchange complementary genes, forming two new molecules.

Surrounded by microtubules, located near the nucleus. (don't try to google it) (give answer only if u know)

Lactase is essential for digesting lactose in milk. this enzyme is specific for this sugar. why? molecules and active sites vary in size; only properly sized molecules can fit.there is a precise compatibility between the active site and the lactose molecule.specificity refers to the action of the enzyme, such as hydrolysis, and relatively few molecules can be hydrolyzed.reaction-specific enzymes assume a fit by folding around the most numerous substrate molecules.

If you were given a map of the sensory cortex in the postcentral gyrus of the cerebrum, do you think the map would have more “space” devoted to the regions of the body that have the highest density of sensory receptors, or the regions of the body that have the lowest density of sensory receptors? explain.