In the cell cycle, controlled degradation of regulatory proteins occurs via the
A) P450-protease pathway.
B) cyclin-Cdk pathway.
C) ubiquitin-proteasome pathway.
D) kinase inhibition pathway.
E) PI3K-Akt pathway.
Answer: C
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True or false: While food chains show linear energy transfer between organisms, food webs depict more realistically what occurs in an ecosystem
A. true B. false
Answer the following questions true (T) or false (F)
1. The decimal reduction time is the time required to kill all the microbes in a given sample. 2. Slow freezing is more damaging to microbial cells than quick freezing. 3. The cell walls of mycobacteria make them vulnerable to water soluble chemical agents.
If you plot mean annual precipitation against mean annual temperature and look at the distribution of major biomes relative to these two variables, which biome would be in the central region of the graph?
A. temperate deciduous forest B. hot desert C. taiga D. tropical rain forest E. savanna
Hornworts differ from mosses and liverworts in containing
A. spores. B. gametophytes. C. sporophytes. D. photosynthetic sporophytes. E. small leaves.