Biology 212 Iowa State Exam 1
Questions and Answers
What are the five characteristics of living things? CORRECT ANSWERS Using
energy, made of cells, process information(genes), reproduction, and evolution
cell theory CORRECT ANSWERS all organisms are made of cells and come from
pre-existing cells
(In aqueous solution) List bonds from weakest to strongest
-covalent, hydrogen, ionic CORRECT ANSWERS Hydrogen, ionic, covalent
What kinds of bonds do carbon, oxygen, nitrogen, and phosphorous form? CORRECT
ANSWERS Covalent(great for biological systems)
Micelles CORRECT ANSWERS tiny droplets created when hydrophilic heads face
water to form hydrogen bonds (form a circle with heads facing out and tails facing in)
Lipid bilayer CORRECT ANSWERS 2 sheets of lipid molecules align so that there is
hydrophilic heads on either side of the molecule (forms a ring structure)
What is permeability? CORRECT ANSWERS The tendency to allow passage of a
given substance
Why is water an excellent solvent? CORRECT ANSWERS Polarity, molecular shape,
and ability to hydrogen bond; oxygen provides a partial negative field while hydrogen
provides partial positive
What happens to ions in an aqueous solution? CORRECT ANSWERS Hydrogen
bonds are formed between water and the ions, separating the ions(i.e NaCl--> Na+ ; Cl-
What is hydrophilic?
What is hydrophobic? CORRECT ANSWERS "Water loving"
"Water fearing"
Hydrophobic interactions CORRECT ANSWERS Interactions between hydrophobic
molecules, which creates hydrogen bonds, promoting stability.
Questions and Answers
What are the five characteristics of living things? CORRECT ANSWERS Using
energy, made of cells, process information(genes), reproduction, and evolution
cell theory CORRECT ANSWERS all organisms are made of cells and come from
pre-existing cells
(In aqueous solution) List bonds from weakest to strongest
-covalent, hydrogen, ionic CORRECT ANSWERS Hydrogen, ionic, covalent
What kinds of bonds do carbon, oxygen, nitrogen, and phosphorous form? CORRECT
ANSWERS Covalent(great for biological systems)
Micelles CORRECT ANSWERS tiny droplets created when hydrophilic heads face
water to form hydrogen bonds (form a circle with heads facing out and tails facing in)
Lipid bilayer CORRECT ANSWERS 2 sheets of lipid molecules align so that there is
hydrophilic heads on either side of the molecule (forms a ring structure)
What is permeability? CORRECT ANSWERS The tendency to allow passage of a
given substance
Why is water an excellent solvent? CORRECT ANSWERS Polarity, molecular shape,
and ability to hydrogen bond; oxygen provides a partial negative field while hydrogen
provides partial positive
What happens to ions in an aqueous solution? CORRECT ANSWERS Hydrogen
bonds are formed between water and the ions, separating the ions(i.e NaCl--> Na+ ; Cl-
What is hydrophilic?
What is hydrophobic? CORRECT ANSWERS "Water loving"
"Water fearing"
Hydrophobic interactions CORRECT ANSWERS Interactions between hydrophobic
molecules, which creates hydrogen bonds, promoting stability.
