Cells with a relatively complex morphology that have a true membrane-delimited nucleus are called
A. nokaryotes.
B. urkaryotes.
C. prokaryotes.
D. eukaryotes.
Answer: D
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A chemist adds a chemical to pure water and there is a 100 fold increase in the concentration of hydrogen ions. What is the best approximation of the new pH value?
A. 0 B. 5 C. 7 D. 9 E. 14
Answer the following statements true (T) or false (F)
1. Animal biomass exceeds plant biomass in most ecosystems. 2. Air pollutants can increase heritable mutations. 3. Insect densities tend to decrease in elevated CO2, all things being equal. 4. Biomagnification of chemicals such as DDT results in lower trophic levels becoming enriched in these chemicals.
The blueberries found in a typical grocery store have several gene differences compared to wild blueberries. What has caused this difference?
A) natural selection B) artificial selection C) a change in the environment D) genetic engineering
A farmer decides to go into the business of raising trout for tourists who enjoy fishing. She builds six trout ponds and stocks each of them with trout from genetically identical stock. Her friends tell her that because she started each pond with just a
few trout, she has created a bottleneck effect and her trout populations are likely to become genetically different rapidly. Which of the following statements about her trout is likely true? A) Because they are all genetically alike, they will all remain alike even though the ponds are different. B) Because each population started off genetically identical, any mutation that occurs in one pond will also occur in the others. C) Because the ponds are different and the populations are likely to experience different mutations, the populations will likely diverge evolutionarily, but only over many generations. D) The increase in genetic diversity caused by sexual reproduction will promote evolutionary divergence over time.