Which of these are true about HIV? it is a retrovirus
it becomes part of the host cell's DNA
It is acute
It has a variable incubation period that can be very long
People with HIV never live very long after diagnosis
It can lead to the disease called AIDS
It infects immune cells, like the T cells

What was photo 51 with rosalind franklin?

How many copies of genes do gametes have?

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.