Based on this chronology of hominin crafts, we might conclude that ________
Fill in the blank(s) with the appropriate word(s).
Answer: needles are a more recent invention than hand axes.
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Earth is tilted about how many degrees on its axis?
a. 8 b. 15 c. 23 d. 30 e. 38
A linear strand of DNA is 1,000 bp long. A recognition sequence for the restriction enzyme Eco R1 is located 300 base pairs (bp) from the 5' end of this linear DNA molecule. Digesting this DNA molecule with Eco RI would produce ________
A) one DNA fragment, 1,000 bp long B) three DNA fragments, two of them 300 bp long and one 400 bp long C) two DNA fragments, one 300 bp long and one 700 bp long D) two fragments, each 500 bp long E) none of the above
You are observing a single cell under a microscope. You go home for the night, and the next day you see four cells. The four cells look similar, and when you stain them with a dye that binds to DNA they all appear to contain the same amount of DNA as the
original cell. What likely happened overnight? A) The single cell divided once to form four new cells via asexual reproduction. B) The single cell divided once to form four new cells via sexual reproduction. C) The single cell divided to form two new cells, and the two new cells each divided to form four total cells, all by asexual reproduction. D) The single cell divided to form two new cells, and the two new cells each divided to form four total cells, all by sexual reproduction.
Bleach has an approximate pH of 13, and pure water has a pH of 7. How much more basic is bleach than pure water?
A) 100× B) 1,000× C) 10,000× D) 100,000× E) 1,000,000×