BIO 156 EXAM 1 PRACTICE 84 STUDY GUIDE 2026 COMPREHENSIVE REVIEW

BIO 156 EXAM 1 PRACTICE 84 STUDY GUIDE
2026 COMPREHENSIVE REVIEW

◉ The mutual attraction of opposite charges holds atoms together as
molecules in a(n) ___ bond.
a. ionic
b. hydrogen
c. polar covalent
d. nonpolar covalent. Answer: a. ionic


◉ Atoms share electrons unequally in a(n) ___ bond.
a. ionic
b. hydrogen
c. polar covalent
d. nonpolar covalent. Answer: c. polar covalent


◉ A(n) ___ substance repels water.
a. acidic
b. basic
c. hydrophobic
d. polar. Answer: c. hydrophobic

,◉ A salt does not release ___ in water.
a. ions
b. H+. Answer: b. H+


◉ Hydrogen ions (H+) are ___.
a. in blood
b. protons
c. indicated by a pH scale
d. all of the above. Answer: d. all of the above


◉ When dissolved in water, a(n) ___ donates H+; a(n) ___ accepts H+.
a. acid; base
b. base; acid
c. buffer; solute
d. base; buffer. Answer: a. base; acid


◉ A ___ can help keep the pH of a solution stable.
a. covalent bond
b. hydrogen bond
c. buffer
d. pH. Answer: c. buffer

, ◉ A ___ is dissolved in a solvent.
a. molecule
b. salt
c. solute
d. chemical bond. Answer: c. solute


◉ Organic molecules consist mainly of ___ atoms.
a. carbon
b. carbon and oxygen
c. carbon and hydrogen
d. carbon and nitrogen. Answer: c. carbon and hydrogen


◉ Each carbon atom can bond with as many as ___ other atom(s).
a. one
b. two
c. three
d. four. Answer: d. four


◉ ___ groups are the "acid" part of amino acids and fatty acids.
a. Hydroxyl (-OH)
b. Carboxyl (-COOH)