Which of the following statements about HIV is false? a. Symptoms appear immediately after the disease in contracted.

b. It can be many years between infection and the appearance of symptoms.

c. It is spread through the exchange of blood or other bodily fluids.

d. HIV and AIDS have no cure.

A is false

Explanation:

HIV and AIDS is a disease that IS spread through the exchange of bodily fluids. There are treatments but NO official cure. Symptoms can appear immediately but its more common for people to feel and appear fine for months and even years.

(Resource: Planned Parenthood)

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products