A strategy used by dissimilatory metal-reducing bacteria that enable their use of insoluble compounds as electron acceptors is to transfer electrons to the metal via external, intermediary compounds such as ________ found in the environment or ________. These compounds are collectively known as ________.
What will be an ideal response?
humic acids, their own secreted metabolites, electron shuttles
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Were there any eukaryotic cells on Earth 1.5 billion years ago?
A. No, they do not appear in the fossil record until around 1 million years ago. B. Yes, they first appear in the fossil record around 1.8 billion years ago. C. No, they do not appear in the fossil record until around 500 million years ago. D. Yes, they first appear in the fossil record around 3.5 billion years ago.
Scientists can compare the relationships between all modern species by examining a gene that performs a similar function in species from all kingdoms. What does this one gene encode?
A) Taq polymerase B) ribosomal RNA C) enzymes needed for photosynthesis D) restriction enzymes
What biogeographic patterns are likely to have played the most prominent role in diversification of ancestral mammalian lineages?
A. Proliferation of grasslands during the Cenozoic era B. Convergent evolution following loss of land bridges during the Cenozoic era C. New opportunities from loss of other vertebrates in the sixth mass extinction event during the Cenozoic era D. Fission and fusion events in plate tectonics during the Mesozoic era
When does the nuclear division of somatic cells take place during cellular reproduction?
a. cytokinesis b. mitosis c. interphase d. meiosis