What is a gene? Why are so many of an organism's traits determined by its genes?
What will be an ideal response?
A gene is a section of DNA that contains the instructions for building a protein. Many organismal traits are determined by genes because the proteins they code for play a huge variety of roles in living organisms. Proteins provide structure, act as hormones, transport molecules, function in cell communication, and protect organisms from disease. In addition, the all-important enzymes, which are required for practically every chemical reaction in cells, are proteins as well.
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If you travel west through 10° of longitude along the equator, the distance traveled will be very different from the distance traveled through 10° of longitude at 60° N. Why?
What will be an ideal response?
Calculate the latitude of a mariner who has measured the noon Sun altitude as 60° above the southern horizon on August 13.
What will be an ideal response?
By the 19th Century, high-culture citizens of Russian emulated another world region. Which region?
A) East Asia B) South Asia C) North America D) Northern Latin America E) Western Europe
Which of the following countries is NOT in Middle America?
a. Belize b. Costa Rica c. Guatemala d. Honduras e. Columbia