Distinguish between cell growth and cell differentiation in plants. What will be an ideal response?
Answer should discuss key features of cell growth (increase in number of cells by cell
division and an increase in cell size by expansion/elongation) as well as the key features of
cell differentiation (biochemical and structural specialization). Growth is controlled by genes
influenced by external and internal environmental signals while differentiation is controlled
by altering the activities of certain genes. See pages 717-719.
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Approximately two billion years ago, ________ were primarily responsible for initially oxygenating Earth
A) algae B) Archaea C) cyanobacteria D) purple sulfur bacteria
Moderate temperatures and precipitation, as well as nutrient-rich soil due to annual leaf fall, characterize this biome
A. temperate Grassland B. temperate Coniferous forest C. taiga D. savannah E. deciduous forest
Most bird species that form flocks show a negative relationship between flock size and individual vigilance (i.e., the larger the flock, the less often an individual lifts its head to scan the surrounding environment). However, some bird species have shown a positive relationship between flock size and individual vigilance. The positive relationship is particularly strong when flocks are space-constrained, such as in small ponds or fields. What is the most likely explanation for this?
A. As flock size increases, the number of "cheaters" increases, so individuals must spend more time scanning for predators. B. As flock size increases, the risk for interference and aggression between members increases, so individuals must scan for both conspecifics and predators. C. As flock size increases, the risk of predation for any given member increases, so individuals must spend more time scanning for predators. D. As flock size increases, mating opportunities decrease, so individuals must spend more time scanning for potential mates.
Which of the following countries is NOT in the
industrial stage? a. Japan b. Canada c. Australia d. Mexico e. United States