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

Biology & Microbiology

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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.

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Gravitropism is based on feedback from which of the following plant structures?

a. vine tendrils b. phototropins c. all of the choices d. statoliths

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Pepsinogen is made by ______ cells of the ________.

A. langerhans; pancreas B. bile; liver C. parietal; stomach D. cheif; stomach E. mucus; large intestine

Biology & Microbiology

Some cyanobacteria reproduce by means of

A) akinetes. B) endospores. C) budding. D) meiosis. E) fragmentation.

Biology & Microbiology