Which sentence describes most golden algae?
a. They are unicellular and autotrophic.
b. They are colonial and autotrophic.
c. They are multicellular and heterotrophic.
d. They are colonial and heterotrophic.
Ans: b. They are colonial and autotrophic.
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____ describes the process by which molecules of a substance will move from regions of high concentration to regions of low concentration (until an equilibrium is reached)
Fill in the blank with the appropriate word.
Which of the following proteins is observed exclusively in association with prokaryotic DNA replication?
A) DNA polymerase I B) primase C) helicase D) single-strand binding proteins E) telomerase
The normal microbiota provides protection against potentially harmful organisms and stimulates the immune system. Why would the immune responses to members of the normal microbiota cross-react with pathogens?
A. Because one person's normal microbiota is another person's pathogen-when we pick up "normal" microbes from a different person, they will always cause infection within us. B. Because pathogens are oftentimes more virulent strains of our own normal microbial microbiota, so they will "look" roughly the same to our immune system (and be acted upon by our immune responses). C. Because the normal microbiota keeps the adaptive immune responses tuned up, active, and ready to respond to broad, general categories of microbes (i.e., Gram-positive vs. Gram-negative microbes, viruses, etc.). D. Because the immune system is a "use it or lose it" system. If it isn't used on a regular basis, we completely lose the ability to respond to pathogens. The normal microbiota keeps the system going so that it can be ready to respond to such pathogens when we're exposed to them.
A flower with carpels and stamens but no petals or sepals is
a. perfect and incomplete. b. imperfect and complete. c. imperfect and incomplete. d. perfect and complete. e. sterile