How are anoxygenic phototrophic microorganisms more physiologically diverse than oxygenic phototrophic microorganisms? Be specific in your answers and use examples to illustrate your conclusions
What will be an ideal response?
Answer: Oxygenic phototrophs (Cyanobacteria) are only capable of using water as an electron donor for photosynthesis. Anoxygenic phototrophs can often use multiple electron donors, such as sulfide, sulfur, ferrous iron, and organic compounds. In addition, all Cyanobacteria are autotrophs, while some anoxygenic phototrophs are capable of both autotrophic and heterotrophic growth. The ability to grow heterotrophically enables many anoxygenic phototrophs to grow without light. Anoxygenic phototrophs also have a variety of different photosystems and pigments that help them harvest different wavelengths of light at greater depths than oxygenic phototrophs.
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The RecFOR complex is called a recombination mediator. To what function of the complex is this referring?
What will be an ideal response?
The molecule shown above is ____
a. a triglyceride b. an amino acid c. a steroid d. a polysaccharide e. a phospholipid
Four of the following statements about turtles are true. Which statement is false?
a. About 300 species of turtles currently exist. b. Turtles do not have teeth. c. Turtle shells are enlarged in marine forms. d. Turtles must return to land to lay eggs. e. Most sea turtle species are highly endangered.
An opportunistic pathogen_____
a. can cause disease when it is transferred to another site in the body b. only causes disease in immunocompromised individuals c. is a part of the resident biota d. is another term for true pathogen e. usually chooses not to cause disease