When taxonomists classify organisms using a phylogenetic approach, they are most concerned with
a. derived traits.
b. ancestral traits.
c. cladists.
d. outgroups.
e. ingroups.
A
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Archaeal membranes contain which of the following lipids?
A. Glycolipids B. Phospholipids C. Sulfolipids D. All of the choices are correct.
The question(s) below are included here for courses that are structured to include written exercises. This may also serve as an exercise for a recitation or discussion section where students work alone or in groups on more difficult conceptual problems
Core Concept 21.6 is also covered in other suites for the chapter, so these questions can be left out if they are not appropriate for your course. What are the fates of new mutations in DNA sequence? What forces are primarily responsible for determining the fate of a new mutation? What will be an ideal response?
What is one possible advantage to targeting quorum-sensing mechanisms for antibiotic development?
A) There may be no selective advantage to individual cells that are resistant to quorum-sensing inhibitors. B) There is a selective advantage to those cells lacking a quorum-sensing system. C) Quorum-sensing mechanisms are found in all pathogenic bacteria. D) Quorum-sensing mechanisms are found only in human pathogens.
During the Pleistocene era, many large mammal species went extinct. Their permanent disappearance occurred in a short period of time when humans were expanding across North America. In this situation, how do many scientists view humans?
A) as a threatened species B) as a density-independent factor C) as an invasive species D) as a biological control agent