General Biology (2) Chemistry of LIfe

What conditions can affect how well an enzyme works in the body?

• temperature

• pH

• diet

• weight

What is considered the smallest unit of matter that cannot be broken down by chemical means?

• atom

• element

• molecule

• compount

What type of strong bonds are used within the water molecule to hold together the atoms of hydrogen and oxygen together?

• hydrogen bonds

• covalent bonds

• ionic bonds

When an atom gains or loses electrons it is called ________.

• a compound

• a catalyst

• an ion

A solution is a mixture of ...

• unevenly distributed substances

• protons & neutrons

• evenly distributed substances

Since water is a polar molecule, what type of substances can be dissolved in it?

• polar substances

• non-polar substances

• both polar & non-polar substances

Which of the following is true of a chemical reaction?

• energy may be absorbed

• energy may be released

• a catalyst may be used increase the rate of the reaction

In living things, energy is needed to ...

• maintain homeostasis

• carry out chemical reactions in the body

• both of these require energy

The basic unit of most biomolecules contains...

• nitrogen

• amino acids

• carbon

Compounds are formed when...

• atoms of an element lose an election

• atoms of the same element join together

• atoms of different elements join together