CP Biology Unit 2 Test Chemistry of Life

An atom's nucleus contains protons and

• neutrons

• electrons

• ions

• elements

The atomic number of an atom is determined by its number of

• neutrons

• protons

• ions

• nuclei

The role of enzymes is to

• slow down reactions

• inhibit or prevent reactions

• speed up reactions

• store energy

Electrons have the following charge

• neutral

• positive

• electrical

• negative

Water is called the universal solvent because

• it has the ability to stick to other surfaces

• many substances dissolve in water

• it forms a dome on top of a penny

The nucleus is found in

• the center of the atom

• Stanhope

• the electron cloud

• the proton

7. In an atom there are an equal number of protons and

• neutrons

• protons

• electrons

• isotopes

8. A polar molecule has a positive end and a

• negative end

• neutral end

• positive end

• acidic end

9. The pH scale has a range between

• 7-14

• 0-6

• 0-15

• 0-14

10. Almost all enzymes are

• lipids

• carbohydrates

• proteins

• monomers