In the Hotchkiss-McManus modification of the PAS technique, aldehydes are formed by:
a) periodic acid
b) chromic acid
c) potassium permanganate
d) sodium bisulfate
Answer: a) periodic acid
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During the course of evolution, one of the main threats to human survival was ____________. Persons who stood the best chance of survival were those __________.
(a) extreme cold; who were heavier and had a protective layer of body fat (b) the presence of vegetation that was toxic if eaten; who ate only meat (c) inconsistent food supplies; who preferred high-calorie foods (d) animal predators; who were lean and could ambulate quickly
Which microscope bombards a whole, metal-coated specimen with electrons moving back and forth over it?
A. scanning electron B. differential interference contrast C. fluorescence D. phase-contrast E. transmission electron
Archaeopteryx is believed to be the transition fossil between reptiles and birds because Archaeopteryx had feathers and
A. scales. B. a pointed, elongated mouth that could evolve into a beak. C. a long reptilian tail. D. a tail similar to modern birds.
Membrane lipids are capable of many different types of movement. Which of these does not occur spontaneously in biological membranes?
(a) switching between lipid layers (b) lateral movement (c) rotation (d) flexing of hydrocarbon chains