Prokaryotic cells and eukaryotic cells reproduce by cell division. Regardless of the type of cell, all cells must __________________ before they divide
A. make an exact copy of their genetic
information
B. separate sister chromatids from one
another
C. complete mitosis
D. reconstruct their nucleus
A
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Which of the following is a facultative, rather than obligate, intracellular pathogen?
A. Rickettsia B. Brucella C. Chlamydia D. All of the choices are correct.
Which of the following characteristics are true for an action potential?
I-A threshold potential must be exceeded for an action potential to occur. II-A stimulus either produces a full action potential or none at all. III-During the refractory period it is less likely that stimuli can produce another action potential. A. I only B. I and II C. II and III D. I and III E. I, II, and III
Tropical rain forests are near the equator; they stay warm all year and have high annual precipitation. Northern coniferous forests have four seasons and most of the precipitation falls during winter and spring
Which of these ecosystems would you expect to be more productive? Explain why.
If you plot mean annual precipitation against mean annual temperature and look at the distribution of major biomes relative to these two variables, which biome would be in the central region of the graph?
A. Tropical rain forest B. Temperate deciduous forest C. Hot desert D. Taiga E. Savanna