The type of microscope in which you would see brightly illuminated specimens against a black background is
A. phase-contrast.
B. dark-field.
C. bright-field.
D. fluorescence.
E. electron.
Answer: B
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Which of the following statements about australopiths is true? a. Thin-enameled molars hint that the australopiths must have eaten a diet of soft plants and tender meat
b. Dentition shows that australopiths were carnivores. c. Australopith footprints found in Tanzania by Mary Leakey proved that they moved by knuckle-walking like modern gorillas. d. Fossils and footprints indicate that all australopiths walked upright.
Gravitropism is based on feedback from which of the following plant structures?
a. vine tendrils b. phototropins c. all of the choices d. statoliths
Pepsinogen is made by ______ cells of the ________.
A. langerhans; pancreas B. bile; liver C. parietal; stomach D. cheif; stomach E. mucus; large intestine
Some cyanobacteria reproduce by means of
A) akinetes. B) endospores. C) budding. D) meiosis. E) fragmentation.