Enzymes increase the rate of reactions. Which sentence is true? 1. The enzymes increase the rate of the reaction due to the changes they themselves undergo. 2. Enzymes repeat their action again and again to speed up activity. 3. Enzymes increase the activation energy of the reaction. 4. Enzymes alter the activity profile of the substrate. (I hope it makes sense. I had to translate it from my native language).

Which best summarizes the finding of avery? a. some traits are recessive. b. humans reproduce sexually. c. dna is a transforming factor. d. traits cannot be inherited.

As a small change in a person's dna can cause a genetic disorder

Which is an advantage of having memory cells when a pathogen is encountered for a second time. a) the memory cells are what proliferate into clones of cells in response to the binding of an antigen. b) memory cells are vital to the primary immune response in that they immediately recognize pathogens even at the first encounter. c) memory cells are essentially effector cells that are short lived and attack antigens even without having a receptor specific to that antigen. d) it ensures that more lymphocytes with a receptor specific to a particular antigen will be present than in a host that had never encountered that pathogen.