GM foods are controversial for many reasons. Which of the following does not represent a controversy between advocates and critics of GM foods?
A) GM foods cause disease in consumers.
B) GM foods have an unknown impact on consumers.
C) GM foods have an unknown impact on the environment.
D) GM foods increase yields on farm land.
Answer: D
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Phosphorus may be abundant in soils but may also be in availability to the plant.
A. excessive B. bound to nitrogen C. limited D. tightly bound E. absorbed
Which of the four major chemicals found in cells comprise telomeres?
A) Carbohydrates B) Lipids C) Proteins D) Nucleic acids
When an action potential begins and sodium channels open, why does sodium rush into the cell? (Check all that apply.)
_____ The inside of the cell is negatively charged. _____ The inside of the cell is positively charged. _____ Chloride ions are waiting to bind to the sodium inside the cell. _____ The diffusion gradient drives sodium into the cell. _____ Channels use energy to move ions across the membrane whenever they are open.
Answer the following statements true (T) or false (F)
1) The period between meiosis I and II is termed interkinesis. 2) Crossing-over occurs during prophase I of meiosis. 3) Crossing-over allows the reassortment of linked genes. 4) The region where the homologous chromosomal pairs align is the metaphase plate. 5) Orientation of each chromosomal pair on the spindle axis is random.