Why do biologists believe that red algae may be one of the most ancient groups of eukaryotes?
What will be an ideal response?
Red algae lack flagella or centrioles, so they must have diverged before the endosymbiosis of bacteria that led to these other structures.
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When Mendel crossed true-breeding yellow seed plants with true-breeding green seed plants, the offspring were phenotypically:
A. yellow seed. B. green seed. C. a mixture of yellow and green seed. D. made up of a combination of yellow and green alleles.
Egg and sperm cells are ____
a. sporophytes b. gametes c. gametophytes d. diploid e. somatic cells
Which factor serves as the primary basis for categorizing a biome?
a. Dominant plant types b. Annual precipitation c. Number of endemic species d. Type of food web
Tropical rain forests are near the equator; they stay warm all year and have high annual precipitation. Northern coniferous forests have four seasons and most of the precipitation falls during winter and spring
Which of these ecosystems would you expect to be more productive? Explain why.