A feature unique to some archaeal plasma membranes is that they may
A. consist of a lipid bilayer that lacks integral membrane proteins.
B. contain sterols such as cholesterol.
C. consist of a lipid bilayer with embedded proteins.
D. consist of a lipid monolayer.
Answer: D
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Which of the following viruses would most likely have reverse transcriptase?
A) an RNA-based lytic virus B) an RNA-based lysogenic virus C) a DNA-based lytic virus D) a DNA-based lysogenic virus
Consider the development of a fossil record for a watershed. A current inventory of all species already has been taken. Which microorganisms might you first consider looking for with the objective of developing a microbial fossil record? Why?
Also, what might depth profiling accomplish? What will be an ideal response?
The organ(s) of the respiratory system that contain alveoli is (are) ________
A) bronchioles B) bronchi C) the glottis D) lungs
Which of the following is a weakness of the biological species concept?
A. It relies on the subjective judgment of experts to decide whether populations are similar enough to be the same species. B. It requires phylogenetic trees, which haven't been estimated yet for many lineages. C. It is not applicable to sexually reproducing species because the offspring are genetically distinct from the parents. D. It isn't applicable to asexual, fossil, or geographically isolated species.