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Biology: The Essentials, 3e (Hoefnagels)
Chapter 2 The Chemistry of Life
1) The most abundant bulk elements that make up the vast majority of living organisms are
A) carbon, hydrogen, oxygen, and calcium.
B) carbon, oxygen, iron, and chlorine.
C) carbon, hydrogen, iron, and calcium.
D) carbon, hydrogen, oxygen, and nitrogen.
E) carbon, oxygen, sulfur, and calcium.
Answer: D
Explanation: These four bulk elements are required for making the macromolecules which
compose all living things. Please see section 2.1
Section: 02.01
Topic: Atoms; Chemical Bonds
Bloom’s: 1. Remember
Learning Outcome: 02.01.01 Identify the most important elements in living organisms.;
02.00.01 Explain the relationship between chemistry and biology.
Accessibility: Keyboard Navigation
2) The atomic number of an atom or element is the number of
A) neutrons in the nucleus.
B) electrons in the nucleus.
C) protons in the nucleus.
D) neutrons in the orbitals.
E) protons in the orbitals.
Answer: C
Explanation: The atomic number is unique to each element. Please see section 2.1B for more
information.
Section: 02.01
Topic: Atoms
Bloom’s: 1. Remember
Learning Outcome: 02.01.02 Describe the structure of atoms.
Accessibility: Keyboard Navigation

BIOLOGY THE ESSENTIALS 3RD EDITION HOEFNAGELS TEST BANK

2
Copyright 2019 © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior
written consent of McGraw-Hill Education.
3) An ion could be
A) an atom that has gained electrons.
B) an atom that has a positive charge.
C) an atom that has lost electrons.
D) an atom that has a negative charge.
E) All answers are correct.
Answer: E
Explanation: Ions can be positively or negatively charged due to the gain or loss of electrons.
Please see section 2.1 for more information.
Section: 02.01
Topic: Atoms
Bloom’s: 1. Remember
Learning Outcome: 02.01.02 Describe the structure of atoms.
Accessibility: Keyboard Navigation
4) If you were told to sort cards into boxes after a lab on elements, you would put into a slot
labelled “Mass Number” any card with text that included the total number of
A) protons, neutrons, and electrons of an atom.
B) protons and electrons of an atom.
C) protons and neutrons of an atom.
D) neutrons and electrons of an atom.
E) protons of an atom.