Daniel D. Chiras: Human Biology, Fifth Edition: Practice Quizzes

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Title Text: Daniel D. Chiras: Human Biology, Fifth Edition

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Point/Counterpoint

Chapter Outlines

Practice Quizzes

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Tools For Learning: Practice Quizzes

Please read each question and select your answer from the choices provided. You must complete all of the questions in order to view your results. At the end of each exam, you have the option to e-mail your results to your instructor.

1: All matter is composed of tiny particles called _______ which consist of a nucleus containing ______ and neutrons.
	A: elements, atoms
	B: atoms, protons
	C: atoms, electrons
	D: isotopes, protons

2: In atoms the number of protons in the nucleus:
	A: is equal to the number of electrons
	B: is always the same as the number of neutrons
	C: is equal to the atomic mass
	D: in the nucleus is equal to the number of protons in the electron cloud

3: The atomic number on the Periodic Table of elements is
	A: unique to every element
	B: equal to the mass of an atom
	C: equal to the number of protons and electrons
	D: equal to the number of protons, neutrons, and electrons

4: An element
	A: consists of atoms of several different types
	B: can be separated into several different types of matter
	C: is the purest form of matter
	D: contains chemical compounds of the same chemical structure

5: A(n) _______ is a form of an atom that contains one or more additional neutrons
	A: neutron
	B: element
	C: ion
	D: isotope

6: A substance made of two or more atoms is a(n)
	A: isotope
	B: element
	C: ion
	D: compound

7: Ionic bonds
	A: are formed when two or more atoms are "joined" by electrostatic forces resulting from slightly different atomic weights
	B: are formed when two atoms are brought together by the sharing of outer shell electrons
	C: are attractions created by two oppositely charged ions
	D: are relatively strong bonds found in organic compounds

8: Covalent bonds
	A: are relatively weak bonds and are rarely found in biological molecules
	B: are formed by the sharing of electrons between atoms
	C: are present in salt, sodium chloride
	D: . can be charged or polar if the atoms involved in the formation of the bond have the same affinity for electrons

9: In a double covalent bond, ___ pairs of electrons are shared by atoms involved in the bond.
	A: 1
	B: 2
	C: 3
	D: 4

10: Hydrogen bonds
	A: link hydrogen atoms of water molecules to the oxygen atoms of the same atom
	B: are weak electrostatic attractions between hydrogens and oxygens on different water molecules
	C: are covalent bonds between hydrogen and oxygen atoms of water and other biologically important molecules like DNA
	D: are strong bonds between neighboring water molecules that give water many of its unique properties

11: Organic compounds are different from inorganic compounds primarily
	A: organic compounds are much smaller than inorganic compounds
	B: organic compounds are primarily composed of oxygen and carbon atoms joined by ionic bonds
	C: organic compounds are composed of carbon and hydrogen atoms joined by covalent bonds
	D: organic compounds are found in nature and inorganic are synthesized in the laboratory

12: Which of the following is true about water?
	A: It is an inorganic compound
	B: It serves as an important lubricant in the body
	C: Participates in many chemical reactions in the body like the breakdown of protein
	D: Helps regulate body temperature in humans
	E: All of the above.

13: A solution that has a surplus of H+ atoms is a(n)
	A: neutral
	B: base
	C: water
	D: acid

14: Which of the following statements is true?
	A: A substance whose pH is 7 is said to be basic
	B: On the pH scale substances over pH 7 are said to be acidic
	C: On the pH scale, a decrease of one unit represents a 10-fold increase in acidity
	D: On a pH scale, a decrease of one unit represents a 10-fold decrease in acidity

15: A substance that helps a solution resist changes in pH is called a(n)
	A: base
	B: buffer
	C: acid
	D: protein

16: Which of the following biochemicals is a primary source of energy in humans?
	A: Proteins
	B: Steroids
	C: Carbohydrates
	D: DNA

17: Which of the following biochemicals is found in the nucleus of cells in chromosomes and stores genetic information?
	A: RNA
	B: Protein
	C: DNA
	D: Carbohydrate

18: Proteins are made from
	A: amino acids
	B: nucleotides
	C: fatty acids
	D: None of the above

19: Which subatomic particle has a negative charge and orbits the nucleus of an atom?
	A: Proton
	B: Neutron
	C: Klingon
	D: Electron

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