BIOC 3021 UNIT 1; STUDY GUIDE EXAM|102 QUESTIONS AND ANSWERS

What are the six most common elements present as covalent components of
bioorganic compounds?
CHNOPS (Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorus, Sulfur)
Bonds in which electrons are SHARED between atoms
Covalent bonds
In living organisms, which are more common, ionic or covalent bonds?
Covalent
Which are stronger, ionic or covalent bonds?
Ionic
Which are longer lasting, ionic or covalent bonds?
Covalent
Covalent bonds in which the atoms have identical EN
Non-polar
Covalent bonds in which the atoms have different EN
Polar
What are common ionic elements in biological systems?
Na and Cl
What happens to ionic substances in the aqueous environment of living
organisms?
They dissociate
What are the properties of the ionic bonds that occur between inorganic ions or
between organic ions?

, Inorganic compounds form ionic bonds (w/ high meting point, single element,
not carbon or hydrogen)
Inorganic compounds form ____ bonds
Ionic
Organic compounds must include what element?
Carbon
Polar bonds, where a partially positive H interacts with a partially negative
element (O, N, F)
H-bonds
Are H-bonds polar or non-polar?
Polar
What organic structures are involved in hydrogen bonding?
O, N, F
What important structure is composed of hydrogen bonding in living
organisms?
DNA/RNA
What are two types of nonpolar bonds?
Peptide bonds and O2 bonds
Why do nonpolar molecules aggregate together in water?
Polar (water) attracts polar and non-polar attracts non-polar
A measure of the hydrogen ion concentration of a solution
pH
Solutions with a high concentration of H-ions have a (high/low) pH
Low
Solutions with a low concentration of H-ions have (high/low) pH
High