Identify the five main classes of echinoderms. List their characteristics and two representatives of each class. What will be an ideal response?
See Table 32-1 on textbook page 672 for characteristics of classes of echinoderms.
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Integrins are glycoproteins that help link the cytoskeleton and the:
A. cytoplasm. B. cell wall. C. ribosomes. D. extracellular matrix.
Psychrotolerant microorganisms can survive and grow at
A) refrigeration temperatures. B) boiling temperatures. C) extreme fluctuations in water availability. D) high salt or sugar concentrations.
Biologists who study biodiversity describe new species and monitor species of which we are aware. Why is the study of biodiversity important in the Anthropocene?
A. The study of biodiversity is important because it provides information about the number of species that go extinct every 1000 years. B. The study of biodiversity is important because it helps quantify the effects of human actions on changes in the traits of many populations (size, density, distribution). C. The study of biodiversity is important because many politicians are biologists and they can influence government policy. D. The study of biodiversity is important because if we don't count all the species on the planet, then we won't be able to identify more potential sources of food.
Why do free-living bacteria, such as Escherichia coli with 4000 genes, have more genes than intracellular bacteria?
What will be an ideal response?