Tracheids are shorter and thinner than vessels
A. true
B. false
A
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Answer the following statements true (T) or false (F)
1. The exoenzyme that causes toxic shock syndrome is called erythrogenic toxin. 2. The neurotoxins produced by Clostridium botulinum and Clostridium tetani cause a spastic, rigid type of paralysis. 3. Although most people use the terms “infection” and “infectious disease” synonymously, microbiologists define infection as colonization by a pathogen. 4. Avirulent strains do not cause disease. 5. It is thought that the waxes in the cell walls of Mycobacterium tuberculosis protect this pathogen from digestion within phagocytes.
Which blood vessels are the site of exchange between the blood and the interstitial fluid?
1.Arteriole 2.Artery 3.Capillary 4.Vein 5.Venule
Environmental resistance is
A) a factor that decreases both death rates and birth rates. B) limits imposed on population growth by only the nonliving environment. C) limits imposed on population growth by only the living environment (e.g., predators or competitors). D) a factor that increases both death rates and birth rates. E) limits imposed on population growth by both the living and nonliving environments.
Which of the following would be considered a +/- relationship?
a) commensalism b) predation c) mutualism d) dominance