Test Bank for Campbell Biology Concepts and Connections 9th Edition Taylor complete guide 2025

Test Bank for Campbell Biology Concepts and Connections
9th Edition Taylor complete guide 2025

,Campbell Biology: Concepts and Connections, 9e (Taylor et al.)
Chapter 2 The Chemical Basis of Life

2.1 Multiple Choice Questions

1) The four most common elements in living organisms are
A) C, H, O, Fe.
B) C, H, O, Na.
C) C, H, O, N.
D) C, N, O, Na.
Answer: C
Topic: 2.1
Skill: Remembering/Understanding
Learning Outcome: 2.1

2) Which of the following is a trace element in the human body?
A) nitrogen
B) zinc
C) oxygen
D) hydrogen
Answer: B
Topic: 2.1
Skill: Remembering/Understanding
Learning Outcome: 2.1

3) Which of the following statements regarding matter is false?
A) All life is composed of matter.
B) All matter has mass.
C) All matter is composed of elements.
D) All matter exists in the form of compounds.
Answer: D
Topic: 2.1
Skill: Remembering/Understanding
Learning Outcome: 2.1

4) Which of the following statements best describes a compound?
A) A compound is a pure element.
B) A compound contains two or more different elements in a fixed ratio.
C) A compound is exemplified by sodium.
D) A compound is a solution.
Answer: B
Topic: 2.1
Skill: Remembering/Understanding
Learning Outcome: 2.1

,5) In the equation 2 H2 + O2 → 2 H2O,
A) H2, O2, and H2O are all compounds.
B) H2, O2, and H2O are all elements.
C) only H2O is a compound.
D) only H2 and O2 are compounds.
Answer: C
Topic: 2.1
Skill: Applying/Analyzing
Learning Outcome: 2.1
Global LO: 2

6) Which of the following trace elements needed by humans is commonly added to table salt?
A) iodine
B) iron
C) magnesium
D) fluoride
sAnswer:
sA sTopic:
s 2.2
Skill: sRemembering/Understanding
sLearning sOutcome: s 2.1
Global sLO: s 5

7) In ssome sareas, sfluoride sis sadded sduring sthe smunicipal swater streatment sprocess sin sorder sto shelp
A) prevent sgoiter.
B) prevent sthe sgrowth sof sbacteria.
C) prevent sthe sdevelopment sof smental sretardation.
D) reduce stooth
sdecay. sAnswer: s D
Topic: s 2.2
Skill:
s Remembering/Understanding
sLearning sOutcome: s 2.1
Global sLO: s 5

8) Which sof sthe sfollowing sparticles sare sfound sin sthe snucleus sof san satom?
A) protons sand sneutrons
B) protons sand selectrons
C) neutrons sand selectrons
D) neutrons, selectrons, sand
sprotons sAnswer: s A
Topic: s 2.3
Skill:
s Remembering/Understanding
sLearning sOutcome: s 2.2

, 9) Electrons smove sabout sthe snucleus sof san satom sin sthe ssame sway sthat
A) insects sfly saround sa sbright slamp sat snight.
B) cars sare sparked salong sthe ssides sof sa sstreet.
C) boats scross sa slake.
D) birds smigrate sto sa snew swinter
shome. sAnswer: s A
Topic: s 2.3
Skill: s Applying/Analyzing
sLearning sOutcome: s 2.2
Global sLO: s 2

10) What sis sthe satomic smass sof san satom sthat shas s6 sprotons, s6 sneutrons, sand s6 selectrons?
A) 6
B) 8
C) 12
D) 18
Answer: s C
sTopic: s 2.3
Skill: s Applying/Analyzing
sLearning sOutcome: s 2.2
Global sLO: s 2, s4

11) An suncharged satom sof sboron shas san satomic snumber sof s5 sand san satomic smass sof
s11. sHow smany selectrons sdoes sboron shave?
A) 11
B) 15
C) 5
D) 2
Answer: s C
sTopic: s 2.3
Skill: s Applying/Analyzing
sLearning sOutcome: s 2.2
Global sLO: s 2

12) The ssodium satom scontains s11 selectrons, s11 sprotons, sand s12 sneutrons. sWhat sis sthe
smass snumber sof ssodium?
A) 11
B) 22
C) 23
D) 34
Answer: s C
sTopic: s 2.3
Skill: s Applying/Analyzing
sLearning sOutcome: s 2.2
Global sLO: s 2, s4