Which statement characterizes human population growth?
a. The rate of human population growth appears to be declining.
b. The rate of human population growth appears to be increasing.
c. The rate of human population growth is exponential.
d. Human birth rates are higher than death rates.
e. Human death rates are higher than birth rates.
ANSWER: a
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Monogamy is more likely to occur in
A. a species with external fertilization. B. a species where females control access to resources. C. a species where females aggregate for social reasons. D. a species with a high degree of female parental care. E. a species that lives in a habitat with very scattered resources.
ALL of the following processes are anaerobic respirations EXCEPT
a. methanotrophy. b. denitrification. c. sulfate reduction. d. acetogenesis.
Which of the following statements correctly describes the vascular cambium?
A. It is important in the elongation of roots. B. It occurs only in monocot stems. C. It develops between the primary xylem and the primary phloem in dicots. D. It is formed by the ground meristem. E. It is responsible for all cell types that result from primary growth.
The beads-on-a-string form of DNA condenses into a compact fiber called the 30 nm filament. Which of the following is true about its formation?
A. Histone H1 is essential for formation of the 30 nm filament. B. The histone tails of the octamer histones are absolutely required for filament formation. C. The zigzag model describes how the nucleosome array adopts a spiral shape when forming the filament. D. The 30 nm filament is also called a tetranucleosome. E. The linker histone is essential for formation of the 30 nm filament.