Which of the following must a pathogen possess in order for it to be successful at causing infectious disease?
A. Ability to be transported initially to the host
B. Ability to exit the host
C. Ability to damage the host
D. Ability to adhere to, colonize, or invade the host
E. All of the choices are correct.
Answer: E
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What will be an ideal response?
Which of the following statements is not a reason that conifers are absent from the tropics and are seemingly restricted to more temperate, cooler regions?
A. Conifers' single-celled tracheids cannot support large levels of transpiration, whereas those of angiosperms can. B. Conifer pollination was not as effective in the tropics as their populations became fragmented by angiosperm competition. C. In colder regions the dangers of cavitation due to freezing restrict angiosperm growth. D. In drier regions, the dangers of cavitation due to drought restrict conifer growth.
A ?-pleated sheet is a type of
A) primary structure found in a protein. B) secondary structure found in a protein. C) tertiary structure found in a protein. D) quaternary structure found in a protein. E) heme structure found in a protein.
Photosynthesis contributes to plant growth by ________
A) taking in oxygen and making wood B) taking in carbon dioxide and making sugars (carbohydrates) C) synthesizing carbon dioxide and making cellulose D) converting sugar to oxygen and water