Employ the principles of evolution discussed in this chapter to explain how the specific features and predatory behaviors of some primitive eukaryotes may have given them a selective advantage over others 1.5 billion years ago
What will be an ideal response?
The Earth's atmosphere became oxygen-rich roughly 1.5 billion years ago. If some primitive predatory eukaryotic cells were similar to modern-day protozoans, they may have been mobile and able to engulf other cells. These characteristics would have been advantageous in the face of a changing atmosphere, and the establishment of a symbiotic relationship with an engulfed aerobe would have been selected for in the eukaryotic cell populations.
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Which of the following would decrease central venous pressure?
A) increased respiratory activity B) standing up C) activity of skeletal muscles D) increased blood volume E) increased sympathetic activi
Which refers to the variations in rates of growth for different parts of the body?
a. allopolyploidy b. preadaptations c. adaptive growth d. allopatric growth patterns e. allometric growth patterns
What event marks the end of zygotene?
a) the beginning of genetic recombination b) the end of synapsis c) the start of metaphase d) the formation of the synaptonemal complex e) the beginning of synapsis
Answer the following questions true (T) or false (F)
1. Southern blotting is a technique that can be used to identify microbes that cannot be cultured. 2. The microbes residing on human skin are part of the human microbiome. 3. Scientists were able to increase the production of naturally occurring vitamin A in rice plants.