Which is the only process that can lead to adaptations and directed genetic change of a population?a. mutation
b. migration
c. inbreeding
d. genetic drift
e. natural selection
e
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DNA evidence suggests that early farmers from Turkey, Syria, Iraq, and other Near Eastern cultures migrated to ________ and interbred with hunter-gatherers there.
A) Europe B) Africa C) North America D) Siberia
Which is true about the invertebrates?
a. They are all deuterostomes. b. Among these animals, the initial indentation in the embryonic ball always becomes the anus. c. All invertebrates share bilateral symmetry. d. They include the simplest living animals. e. Invertebrates only have a simple backbone.
When comparing the gene coding for cytochrome c in several species, it was noted that humans and chimpanzees
share the identical amino acid sequence. This means that ____. a. humans and chimpanzees can mate and produce viable offspring b. humans evolved from chimpanzees c. over time, chimpanzees will eventually evolve into primitive humans d. humans and chimpanzees are closely related in evolutionary time e. chimpanzees will eventually evolve to become human
You are studying a bacterium found in the normal intestinal flora of humans and most other mammals, and are doing an experiment to determine the optimum growth rate of this bacteria. You have inoculated five nutrient broths, and are incubating one broth at each of the following temperatures: 5oC, 25oC, 38oC, 42oC, and 55oC. At which temperature would you predict to see the optimum growth rate?
5oC 25oC 38oC 42oC 55oC