Mycorrhizae, specialized symbiotic associations between the roots of plants and fungi, are characteristic of
A. all plants.
B. about 60% of all plants.
C. about 40% of all plants.
D. about 90% of all plants.
E. about 20% of all plants.
Answer: D
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After which Period did the last mass extinction
occur?
a. Permian b. Triassic c. Jurassic d. Ordovician e. Cretaceous
Which component of air pollution can react with sunlight to form chemicals similar to tear gas?
a. carbon dioxide b. nitric oxide c. sulfuric oxide d. chlorofluorocarbons e. ozone
The central dogma of molecular biology states that information flows in one direction from
A.) nuclei to RNA to cytoplasm B.) ribosomes to proteins to DNA C.) genes to nuclei to ribosomes D.) DNA to RNA to proteins
Suppose that each species of Galápagos tortoise has a distinctive shell. Variations in shell size make some tortoises better adapted for defence. Imagine an island where many hunt on these tortoises; individuals with a larger shell would be more likely to survive and reproduce than would tortoises with smaller shells. These favoured individuals would pass on the genes that produce larger shells to their descendants, while those with smaller shells would not reproduce, leading to extinction. Which of the following would be most likely to drive this event?
a. spontaneous selection b. hereditary selection c. natural selection d. artificial selection