Scientists agree that life originated on Earth
Indicate whether the statement is true or false.
ANSWER: True
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Answer the following statements true (T) or false (F)
1. All diseases caused by Rickettsia spp. are arthropodborne. 2. Viruses contain both DNA and RNA. 3. The cell walls of archaeans contain a thicker layer of peptidoglycan than bacterial cell walls. 4. On entering a bacterial cell, all bacteriophages immediately initiate the lytic cycle. 5. Mycoplasmas cannot grow on artificial media.
During a normal breathing cycle, pressure changes are essential to the exchange of gases with the environment. Describe what type of pressure changes must occur during ventilation
What will be an ideal response?
In snapdragons, FR = red flowers and FW = white flowers. Plants heterozygous for flower color have pink flowers. A cross between two pink-flowered plants will produce ____ red-flowered plants.
A. 100% B. 75% C. 50% D. 25%
Among the mammals, only some primates (including most humans) have color vision. What was the likely advantage that probably drove the evolution of primate color vision?
A. the ability to identify grains most appropriate for domestication B. the ability to find ripe fruit C. the ability to identify plants with medicinal value D. the ability to prepare for winter as portended by autumn colors of leaves E. the ability to enjoy the aesthetic value of flowers