BIOLOGY 171 PREPARATION TEST 2026
QUESTIONS AND CORRECT ANSWERS
GRADED A+
● charge of particles. Answer: more protons positive, more electrons
negative
● Atomic number. Answer: # or protons
● Atomic mass. Answer: # of protons and neutrons added
● Organization of electrons. Answer: 2 in 1st ring, 8 in 2nd ring
● Isotopes. Answer: atoms with same number of protons but have
different number of neutrons
● Relative abundance of C,H,N,O in humans. Answer: 95% of total
mass
● What is a mole?. Answer: measurement of small particles such as
atoms and molecules
, ● How many grams are in a mole of a particular element?. Answer:
6.022 x 10^23
● Valence electrons. Answer: electrons in outer shell that can participate
in chemical bonds.
● Covalent bonds. Answer: atoms share electrons to fill their outer
shells
● Hydrogen bonds. Answer: a weak attraction between a partially
positive hydrogen and a partially negative atom such as oxygen
● ionic bonds. Answer: attraction between a positively charged ion and
a negatively charged ion
● Polar Covalent bond. Answer: forms when atoms don't share electrons
equally
● non-polar covalent bond. Answer: two atoms shared electrons equally
● Isomer. Answer: molecules with same chemical makeup but different
structures
● Solutes. Answer: dissolved substances
QUESTIONS AND CORRECT ANSWERS
GRADED A+
● charge of particles. Answer: more protons positive, more electrons
negative
● Atomic number. Answer: # or protons
● Atomic mass. Answer: # of protons and neutrons added
● Organization of electrons. Answer: 2 in 1st ring, 8 in 2nd ring
● Isotopes. Answer: atoms with same number of protons but have
different number of neutrons
● Relative abundance of C,H,N,O in humans. Answer: 95% of total
mass
● What is a mole?. Answer: measurement of small particles such as
atoms and molecules
, ● How many grams are in a mole of a particular element?. Answer:
6.022 x 10^23
● Valence electrons. Answer: electrons in outer shell that can participate
in chemical bonds.
● Covalent bonds. Answer: atoms share electrons to fill their outer
shells
● Hydrogen bonds. Answer: a weak attraction between a partially
positive hydrogen and a partially negative atom such as oxygen
● ionic bonds. Answer: attraction between a positively charged ion and
a negatively charged ion
● Polar Covalent bond. Answer: forms when atoms don't share electrons
equally
● non-polar covalent bond. Answer: two atoms shared electrons equally
● Isomer. Answer: molecules with same chemical makeup but different
structures
● Solutes. Answer: dissolved substances
