________ are chemical substances produced in small quantities in one part of an organism and then transported to another part of the organism, where they bring about physiological responses.
A. Glycoproteins
B. Photosynthates
C. Pulvini
D. Heat shock proteins
E. Hormones
Answer: E
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The rate differences between molecular clocks are due largely to differences in _____. Thus, the extreme case of a fast molecular clock is derived from a _____
A. the intensity of selection; histone proteins B. the size of the molecule; pseudogenes C. the intensity of selection; pseudogene D. the size of the molecule; histone proteins E. none of these
Which of the following is NOT a function of cellular membranes?
A. selective uptake and export of ions and molecules B. cell compartmentalization C. cell signaling D. maintenance of cell shape E. cell adhesion
Why aren't insect tracheae associated with capillary beds?
A. Insect capillaries are found only around the gut. B. Insects have an open circulatory system. C. Insects have external gills associated with hemolymph vessels. D. Insects use an air sac respiratory system.
What is the ultimate source of energy for almost all organisms?
a. catabolism of sugars b. ATP c. catabolism of fats d. the sun e. catabolism of sugars, fats, and proteins