Cancers of nerve tissues in the brain are called ____
a. sarcomas
b. leukemia
c. gliomas
d. lymphomas
e. adenocarcinomas
ANSWER: c
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Pepsin, a digestive enzyme that degrades proteins in the stomach, is synthesized as pepsinogen and
converted to active pepsin in the stomach by the removal of several amino acids. The activation of pepsin is an example of
a. transcriptional regulation. b. translational regulation. c. posttranscriptional regulation. d. posttranslational regulation. e. RNA interference.
A rod-shaped bacterium’s length of 1.50 ?m can
also be expressed as a. 0.0015mm. b. 0.00015cm. c. 1.5x10-6m. d. 1.5x10-4cm. e. all of these.
Briefly explain the iron-sulfur world hypothesis and identify two pieces of evidence that support this hypothesis. What will be an ideal response?
These are nonphotosynthetic plankton, including aquatic protozoa and tiny animals.
A. phytoplankton B. thermophiles C. zooplankton D. diatoms