Self Quiz

1. The atomic number of an element a. equals the number of neutrons in an atom.

b. equals the number of protons in an atom.

c. equals the number of protons minus the number of neutrons.

d. equals the number of neutrons plus the number of protons.

e. depends on the isotope.

2. The atomic weight (atomic mass) of an element a. equals the number of neutrons in an atom.

b. equals the number of protons in an atom.

c. equals the number of electrons in an atom.

d. equals the number of neutrons plus the number of protons.

e. depends on the relative abundances of its isotopes.

3. Which of the following statements about all the isotopes of an element is not true?

a. They have the same atomic number.

b. They have the same number of protons.

c. They have the same number of neutrons.

d. They have the same number of electrons.

e. They have identical chemical properties.

4. Which of the following statements about a covalent bond is not true?

a. It is stronger than a hydrogen bond.

b. One can form between atoms of the same element.

c. Only a single covalent bond can form between two atoms.

d. It results from the sharing of electrons by two atoms.

e. One can form between atoms of different elements.

5. Hydrophobic interactions a. are stronger than hydrogen bonds.

b. are stronger than covalent bonds.

c. can hold two ions together.

d. can hold two nonpolar molecules together.

e. are responsible for the surface tension of water.

6. Which of the following statements about water is not true?

a. It releases a large amount of heat when changing from liquid into vapor.

b. Its solid form is less dense than its liquid form.

c. It is the most effective solvent of polar molecules.

d. It is typically the most abundant substance in an active organism.

e. It takes part in some important chemical reactions.

7. The following reaction occurs in the human stomach:

This reaction is an example of the a. cleavage of a covalent bond.

b. formation of a hydrogen bond.

c. elevation of the pH of the stomach.

d. formation of ions by dissolving an acid.

e. formation of polar covalent bonds.

8. The hydrogen bond between two water molecules arises because water is a. polar.

b. nonpolar.

e. hydrophobic.

9. Which of the following statements about the carboxyl group is not true?

a. It has the chemical formula —COOH.

b. It is an acidic group.

c. It can ionize.

d. It is found in amino acids.

e. It has an atomic weight of 75.

10. The three most abundant elements in a human skin cell are a. calcium, carbon, and oxygen.

b. carbon, hydrogen, and oxygen.

c. carbon, hydrogen, and sodium.

d. carbon, nitrogen, and oxygen.

e. nitrogen, hydrogen, and oxygen.

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Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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