What element is essential for microbes and can restrict the growth of pathogens when bound by antimicrobial proteins?
A. Iron
B. Hemoglobin
C. Pyrogen
D. Calcium
A. Iron
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Where will RNA polymerase bind to a prokaryotic operon to initiate transcription if a repressor is absent?
a. transcriptional start site b. promoter c. operator d. coding region
The fossil record shows that the jawed fishes called ____ diversified in the Devonian and
Carboniferous periods, but they left no direct descendants. Their heads were covered with large, heavy plates of bone, and their jaws had sharp cutting edges.
a. acanthodians b. conodonts c. osteolepiforms d. placoderms e. ostracoderms
Mitochondria arose from an endosymbiotic relationship between a eukaryotic cell and an aerobic bacteria. Which statement supports this theory?
a. Fossilized mitochondria are older than the oldest fossilized eukaryotes. b. Mitochondria can produce ATP outside of a eukaryotic cell. c. A mitochondrion has its own DNA in the form of a single circular chromosome, like bacteria. d. A mitochondrion has a only one outer membrane. e. A mitochondrion can survive indefinitely when removed from a eukaryotic cell.
____ promote cancer development, while ____ prevent cancer development
a. Oncogenes; tumor suppressor genes b. Tumor suppressor genes; homeobox genes c. Tumor suppressor genes; oncogenes d. Oncogenes; homeobox genes e. Homeobox genes; proto-oncogenes