There are two types of influenza that can cause serious illness and spread through the population
Indicate whether the statement is true or false
True
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That some organisms contain much larger amounts of DNA than are apparently "needed" and that other relatively closely related organisms may have vastly different amounts of DNA is more typical in ________
A) the alphoid rather than the diphloid family B) eukaryotes than in prokaryotes C) RNA viruses than in DNA viruses D) viruses than in bacteria E) prokaryotes than in eukaryotes
An easy way to remember the signs of skin cancer is this memory trick suggested by the American Cancer Society: ________
Fill in the blank(s) with correct word
Green and purple bacteria
A) contain chlorophyll a like plants. B) give off oxygen as a product of photosynthesis. C) live in salt water. D) include species that use sulfur in photosynthesis.
Compared with the numbers of grasshoppers or deer, there are not as many mountain lions. The reason that large top-level carnivores are more rare in an ecosystem is because
A. food chains are only 10 to 20% efficient at each step, and top carnivores are therefore limited by the availability of food in their range. B. through natural selection, most fierce animals have been killed off by others. C. such animals do not tolerate other members like them. D. only a few such animals are permitted by succession in a biome, and there are only a few biomes.