Biology 1406 / General Biology I
Professor: Manhal Chbat, MD
Self Quiz Ch 2
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) About 25 of the 92 natural elements are known to be essential to life. Which four of these 25 elements
make up approximately 96% of living matter?
A) carbon, oxygen, sulfur, calcium
B) carbon, hydrogen, nitrogen, oxygen
C) carbon, sulfur, phosphorus, hydrogen
D) carbon, sodium, chlorine, nitrogen
E) oxygen, hydrogen, calcium, sodium
1) _____
2) Trace elements are those required by an organism in only minute quantities. Which of the following is a
trace element that is required by humans and other vertebrates?
A) sodium
B) nitrogen
C) phosphorus
D) calcium
E) iodine
2) _____
3) Three or four of the following statements are true and correct. Which one, if any, is false? If all the
statements are true, choose answer E.
A) Virtually all organisms require the same elements in the same quantities.
B) Carbon, hydrogen, oxygen, and nitrogen make up approximately 96% of living matter.
C) The trace element iodine is required only in very small quantities by vertebrates.
D) Iron is an example of an element needed by all organisms.
E) All of the other statements are true and correct.
3) _____
4) Each element is unique and different from other elements because of the number of protons in the nuclei
of its atoms. Which of the following indicates the number of protons in an atom's nucleus?
A) mass weight
B) atomic mass
C) mass number
D) atomic weight
E) atomic number
4) _____
5) The mass number of an element can be easily approximated by adding together the number of
__________ in an atom of that element.
A) neutrons and electrons
B) energy levels
C) isotopes
D) protons and neutrons
E) protons and electrons
5) _____
6) What is the approximate atomic mass of an atom with 16 neutrons, 15 protons, and 15 electrons?
A) 30 daltons
B) 46 daltons
C) 16 daltons
D) 15 daltons
E) 31 daltons
6) _____
7) Oxygen has an atomic number of 8 and a mass number of 16. Thus, the atomic mass of an oxygen atom
is
A) exactly 8 daltons.
B) approximately 16 daltons.
C) 24 amu (atomic mass units).
D) exactly 8 grams.
E) approximately 16 grams.
7) _____
8) Calcium has an atomic number of 20 and an atomic mass of 40. Therefore, a calcium atom must have
A) 40 neutrons.
B) 40 electrons.
C) 20 protons.
D) A and B only
E) A, B, and C
8) _____
9)
9) _____
One difference between carbon-12 (
C) and carbon-14 (
A) two more protons than carbon-12.
B) two more neutrons than carbon-12.
C) two more electrons than carbon-12.
D) B and C only
E) A and C only
C) is that carbon-14 has
10) Which of the following best describes the relationship between the atoms described below?
Atom 1
A)
B)
C)
D)
E)
10) _____
Atom 2
H
H
They are polymers.
They are isomers.
They each contain 1 neutron.
They contain 1 and 3 protons, respectively.
They are isotopes.
11) From its atomic number of 15, it is possible to predict that the phosphorus atom has
A) 15 neutrons.
B) 15 electrons.
C) 15 protons.
D) 8 electrons in its outermost electron shell.
E) B and C only
11) _____
12) The atomic number of neon is 10. Therefore, which of the following is correct about an atom of neon?
A) It has 8 electrons in its outer electron shell.
B) It is inert.
C) It has an atomic mass of 10 daltons.
D) A and B only
E) A, B, and C are correct.
12) _____
13) The nucleus of a nitrogen atom contains 7 neutrons and 7 protons. Which of the following is a correct
statement concerning nitrogen?
A) The nitrogen atom has a mass number of approximately 7 daltons and an atomic mass of 14.
B) The nitrogen atom has a mass number of approximately 14 daltons and an atomic mass of 7.
C) The nitrogen atom has a mass number of 7 grams and an atomic number of 14.
D) The nitrogen atom has a mass number of 14 and an atomic mass of approximately 14 daltons.
E) The nitrogen atom has a mass number of 14 and an atomic mass of 7 grams.
13) _____
14) Different atomic forms of an element contain the same number of protons but a different number of
neutrons. What are these different atomic forms called?
A) isotopes
B) ions
C) neutronic atoms
D) isomers
E) radioactive atoms
14) _____
15) Electrons exist only at fixed levels of potential energy. However, if an atom absorbs sufficient energy, a
possible result is that
A) an electron may move to an electron shell farther out from the nucleus.
B) the atom would become a positively charged ion, or cation.
C) an electron may move to an electron shell closer to the nucleus.
D) the atom would become a negatively charged ion, or anion.
E) the atom may become a radioactive isotope.
15) _____
16) Atoms whose outer electron shells contain eight electrons tend to
A) form covalent bonds in aqueous solutions.
B) form ionic bonds in aqueous solutions.
C) be stable and chemically nonreactive, or inert.
D) be unstable and chemically very reactive.
16) _____
E) be isotopes and very radioactive.
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
Please refer to Figure 2.1 to answer the following questions.
Figure 2.1
17)
17) _________
Which drawing depicts the electron configuration of neon (
Ne)?
18) Which drawing is of an atom with the atomic number of 6?
18) _________
19)
19) _________
Which drawing depicts the electron configuration of oxygen (
O)?
20)
20) _________
Which drawing depicts the electron configuration of nitrogen (
N )?