Characterize the demographic transition seen in the human population. When did it occur?
What will be an ideal response?
The demographic transition was the period of change to low birthrates, and accompanying low death rates. In parts of Europe that are industrialized, and in most of North America, it occurred in the early 1900s. During that period, these changes were not seen in the lesser developed countries of the world, although evidence indicates that it may be beginning currently, albeit at a slower rate.
You might also like to view...
Answer the following statements true (T) or false (F)
1. When lactose becomes available the genes encoding ?-galactosidase and lactose permease are upregulated in E. coli. 2. Different globin polypeptides are expressed at similar levels during the embryonic and fetal stages of mammalian development. 3. Bacteria can regulate gene expression by controlling the rate at which mRNA is translated into protein. 4. Small effector molecules directly bind the DNA they regulate.
By weight, chromatin consists roughly of
A) 1/3 DNA, 1/3 histones, and 1/3 nonhistones. B) 1/3 DNA and 2/3 acidic proteins. C) 1/2 DNA, 1/4 histones, and 1/4 basic proteins. D) 1/4 DNA, 1/4 RNA, 1/4 histones, and 1/4 nonhistones.
Which of the following statements best describes the effects of caffeine on the body?
A. Caffeine is only water-soluble, not fat-soluble, so it is less likely to be absorbed into the bloodstream. B. Caffeine is considered a psychoactive drug because it changes brain function. C. Caffeine cannot readily cross the plasma membrane into body cells, so all effects are short-lived. D. Caffeine is a diuretic and can cause extreme water loss. E. In the brain, caffeine activates receptors for adenosine and blocks the action adrenaline.
physical sciences
What will be an ideal response?