Which statements describe pathogens? Check all that apply.
Bacteria and viruses cause infectious diseases.
Fungi and parasites cause noninfectious diseases.
Fungi and bacteria affect only the top layer of the skin.
Many pathogens may be spread through contaminated surfaces.
All pathogens multiply by entering a cell and using its organelles to multiply.

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What does polymerase chain reaction (pcr) do? o a. separates dna fragments by size o b. cuts a dna sample into fragments o c. provides an overall picture of a person's chromosomes o d. makes more copies of a sample of dna

What happens as electrons move along the chain of molecules known as the electron transport chain? they gain energy, which causes atp molecules to lose phosphate groups. they gain energy, which causes h *ions to join with oxygen to produce water. they lose energy, which is then used by the cell to make atp. they lose energy, which is then used to break down atp.