Which of the following living reptiles care for their young and have a four-chambered heart, as birds do?
A. lizards
B. crocodiles
C. turtles
D. tuataras
E. snakes
Answer: B
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True or false: Regardless of the amino acid to be added to a tRNA molecule, all tRNA molecules use the same sequence at their 3' end to serve as the amino acid attachment site
A. true B. false
The addition of excess phosphorous causes lakes to become eutrophic because the nutrients trigger
blooms of photosynthetic cyanobacteria. Why do these blooms cause low oxygen levels in lakes?
a. Cyanobacteria use up more oxygen than they produce. b. Excess phosphorous binds to dissolved oxygen in the water. c. Cyanobacteria are net producers of oxygen while alive, but when they die aerobic bacteria use oxygen while decomposing them. d. Cyanobacterial blooms only occur in waters naturally low in oxygen. e. Cyanobacteria are aerobic heterotrophs, consuming oxygen and producing carbon dioxide.
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.
Which of the following is true of a population's intrinsic rate of increase?
A) It occurs when the birth rate equals the death rate. B) It is the rate at which a population would grow if there were no external limits to growth. C) It is the death rate minus the birth rate, or a measure of annual population change in a population near K. D) It is the rate at which populations grow in nature in the face of all environmental limits.