Pyrimidines
What will be an ideal response?
single-ring structures
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What is the main role of the pigment molecules within the antenna or light-harvesting complex?
A. Oxidize water and release oxygen to the reaction center chlorophyll. B. Absorb photons and transfer light energy to the reaction center chlorophyll. C. Synthesize NADPH. D. Pass electrons to the electron transport chain and then to NADPH. E. Increase H+ concentration in the stroma.
The female reproductive tract of some Drosophila species blocks sperm of another species from reaching her eggs
This is an example of ____.
a. gametic isolation b. hybrid breakdown c. hybrid inviability d. mechanical isolation e. temporal isolation
The boundaries between communities are usually sharply defined and easily discerned
Indicate whether the statement is true or false
What features of charophytes provides evidence for charophytes being the closest relative to land plants?
A. Charophytes are fully terrestrial. B. Charophytes possess plasmodesmata. C. Charophytes are the only photosynthetic protists. D. Charophytes produce seeds and flowers.