When a mixture of live nonvirulent bacteria and dead virulent bacteria was injected into mice, Griffith unexpectedly found that the injected mice died. He explained this result by suggesting that the nonvirulent bacteria are being
A. transcribed.
B. activated.
C. transformed.
D. expressed.
E. translated.
Answer: C
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Answer the following statement(s) true (T) or false (F)
1. Resource partitioning would be most likely to occur between allopatric populations of species with similar ecological niches. 2. Mimicry is a form of camouflage. 3. Solar energy is the same thing as heat energy.
When a blood vessel is cut, why does vasoconstriction take place?
a. to expose collagen fibers to which platelets can adhere b. to trigger the release of platelets from the surrounding tissues c. to initiate the activation of thrombin d. to entrap white blood cells e. to reduce the flow of blood
Primary growth at the apical meristems can produce cells that differentiate into each of these cell types, except which?
A. epidermis B. cork cambium C. leaves D. ground tissue E. procambium
Coral reefs are highly productive and diverse ecosystems because :
A) they have high turnover rates with high polyp production. B) corals produce limestone skeletons that create habitats for many ocean species. C) they are composed of polyps that live in and are adapted to warm, shallow tropical waters with high nutrient availability. D) they are made of limestone that supports many species of zooplankton with high productivity.