All of the following are components associated with bacterial cytoskeletons except
A) FtsZ.
B) MreB.
C) plectin.
D) crescentin.
E) A, B, C, and D are associated with the bacterial cytoskeletons.
Answer: C
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You track aquatic coastal levels of nitrogen and phosphorus at high latitudes and notice a sharp increase in the winter and then again in the spring. What do you expect the effect of these nutrient increases will be on the plankton populations?
A. sharp spikes in population levels at essentially the same time (or, in phase) with the spikes in nutrients B. sharp spikes in population levels some time after (or, out of phase) with the spikes in nutrients C. a sharp spike in population levels in the spring, when light levels are higher; not much of a response in winter D. no effect of the changes in nutrient concentration on the plankton populations in either winter or spring
How are termite-related protists and aphid-related proteobacteria similar?
A. Both are types of endosymbiotic bacteria. B. Both are parasites to their respective hosts. C. Both are protozoans that live within insect hosts. D. Both are mutualists with their respective hosts.
The outward-facing cell walls of epidermal cells contain which substance to reduce water loss?
a. wax b. pectin c. lignin d. suberin e. chitin
Fossil evidence places the origin of angiosperms in the early Cretaceous period, at least 130 million years ago. By 100 million years ago, all of today's major lineages of angiosperms had evolved. Angiosperms make up 95% of all modern plants species. Which of the following may help explain the rapid success of angiosperms?
A. use of the wind to disperse pollen and seeds B. use of flowers and fruits to protect and disperse both pollen and seeds C. use of the wind to disperse spores D. use of water to disperse pollen and seeds E. All answers are correct.