Download Answers to Biological Inquiry Questions – Brooker et al ARIS site

Answers to Biological Inquiry Questions – Brooker et al ARIS site
Chapter 2
Figure 2.4
BIOLOGICAL INQUIRY QUESTION: What is the difference between an energy shell and an
orbital?
ANSWER: An electron shell is an energy level. More than one orbital can be found within an
electron shell. Each orbital has a defined shaped and contains up to two electrons.
Figure 2.9
BIOLOGICAL INQUIRY QUESTION: Explain how an oxygen molecule obeys the octet rule.
ANSWER: Oxygen has six electrons in its outer shell. When two oxygen atoms share two pairs of
electrons, each atom has eight electrons in its outer shell, at least part of the time.
Figure 2.11
BIOLOGICAL INQUIRY QUESTION: As discussed in Chapter 11, DNA strands must separate for
DNA to be replicated. Do you think the process of strand separation requires energy, or do you
think the strands can separate spontaneously?
ANSWER: Strand separation requires energy, because the DNA strands are held together by a
large number of hydrogen bonds. (In Chapter 11, you will learn that ATP provides the energy to
separate DNA strands during DNA replication).
Figure 2.21
BIOLOGICAL INQUIRY QUESTION: What is the OH- concentration at pH 8?
ANSWER: It is 10-6 M. Because [H+][OH-] always equals 10-14 M, if [H+] = 10-8 (i.e., pH 8.0), then
[OH-] must be 10-6 M.