BIOLOGY EXAM 1 QUESTIONS AND
ANSWERS
The atomic number of sulfur is 16. Sulfur combines with hydrogen by covalent
bonding to form a compound, hydrogen sulfide. Based on the number of valence
electrons in a sulfur atom, predict the molecular formula of the compound.
A. HS
B. HS2
C. H2S
D. H4S - ANSWER-C. H2S
What coefficients must be placed in the following blanks so that all atoms are
accounted for in the products?
C6H12O6→ C2H6O+ CO2
A. 2;1
B. 3;1
C. 1;3
D. 2;2 - ANSWER-D. 2;2
Which sentence best describes the logic of scientific inquiry?
A. If I generate a testable hypothesis, tests and observations will support it.
B. If my prediction is correct, it will lead to a testable hypothesis.
C. If my observations are accurate, they will support my hypothesis.
D. If my prediction turns out to be correct, my hypothesis is supported. - ANSWER-
D. If my prediction turns out to be correct, my hypothesis is supported.
Compared with P31, the radioactive isotope P32 has
A.a different atomic number.
B. one more proton.
C. one more electron.
D. one more neutron. - ANSWER-D. one more neutron.
In the term trace element, the adjective trace means that
A. the element is required in very small amounts.
B. the element can be used as a label to trace atoms through an organism's
metabolism.
C. the element is very rare on Earth.
D. the element enhances health but is not essential for the organism's long-term
survival. - ANSWER-A. the element is required in very small amounts.
The reactivity of an atom arises from
A. the average distance of the outermost electron shell from the nucleus.
B. the existence of unpaired electrons in the valence shell.
C. the sum of the potential energies of all the electron shells.
D. the potential energy of the valence shell. - ANSWER-B. the existence of unpaired
electrons in the valence shell.
ANSWERS
The atomic number of sulfur is 16. Sulfur combines with hydrogen by covalent
bonding to form a compound, hydrogen sulfide. Based on the number of valence
electrons in a sulfur atom, predict the molecular formula of the compound.
A. HS
B. HS2
C. H2S
D. H4S - ANSWER-C. H2S
What coefficients must be placed in the following blanks so that all atoms are
accounted for in the products?
C6H12O6→ C2H6O+ CO2
A. 2;1
B. 3;1
C. 1;3
D. 2;2 - ANSWER-D. 2;2
Which sentence best describes the logic of scientific inquiry?
A. If I generate a testable hypothesis, tests and observations will support it.
B. If my prediction is correct, it will lead to a testable hypothesis.
C. If my observations are accurate, they will support my hypothesis.
D. If my prediction turns out to be correct, my hypothesis is supported. - ANSWER-
D. If my prediction turns out to be correct, my hypothesis is supported.
Compared with P31, the radioactive isotope P32 has
A.a different atomic number.
B. one more proton.
C. one more electron.
D. one more neutron. - ANSWER-D. one more neutron.
In the term trace element, the adjective trace means that
A. the element is required in very small amounts.
B. the element can be used as a label to trace atoms through an organism's
metabolism.
C. the element is very rare on Earth.
D. the element enhances health but is not essential for the organism's long-term
survival. - ANSWER-A. the element is required in very small amounts.
The reactivity of an atom arises from
A. the average distance of the outermost electron shell from the nucleus.
B. the existence of unpaired electrons in the valence shell.
C. the sum of the potential energies of all the electron shells.
D. the potential energy of the valence shell. - ANSWER-B. the existence of unpaired
electrons in the valence shell.
