Which of the following would be an example of the bottleneck effect?
a) one species of insect splitting in two species without any sort of physical isolation
b) certain plants having genetic advantages that allow them to produce more offspring
c) most of the fish in a pond being poisoned, leaving only a few survivors
d) birds transporting seeds from one island to another
Ans: c) most of the fish in a pond being poisoned, leaving only a few survivors
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In the context of chemical evolution, DNA's structure is interesting because it suggests a possible copying mechanism. What about DNA's structure facilitates copying?
A) It has the same number of purines and pyrimidines. B) The nitrogenous bases are located on the inside of the double helix. C) The strands of the double helix are complementary. D) DNA always goes from 5 prime to 3 prime.
An infectious organism isolated from a patient has a sequence on its genome TATTGAAGC. This will hybridize to the RNA probe UAUUGAAGC.
Answer the following statement true (T) or false (F)
Match the following items to the correct phrase.
_______1. Viruses that infect bacteria and cause the lytic cycle to occur. _______2. Term meaning complete viral particles. _______3. Are known to cause some plant diseases, but no animal diseases. _______4. Infectious protein molecules. _______5. Infectious molecules of RNA. _______6. Cause diseases such as Creutzfeldt-Jacob disease, “mad cow disease,” and “scrapie.” a. viroids b. virions c. prions d. temperate phages e. virulent phages
The ecological role of fungi is that of:
a. decomposers. b. producers. c. grazers. d. predators. e. herbivores.