Which phrase describes the selective permeability of a membrane?
a. the ability of a molecule to pass through a membrane
b. the ability of only certain molecules to pass across a membrane
c. the need for carrier proteins to transport certain molecules
Ans: b. the ability of only certain molecules to pass across a membrane
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A common source of DNA for forensic testing is
A) the skin between the toes. B) cells scraped from inside the cheek. C) red blood cells. D) mucus.
Scientific facts rely on
1.opinion. 2.prediction. 3.verifiable information. 4.critical thinking.
Within biological systems, there are always reactions that seem to occur when thermodynamically they should not. An example is in the process of glycolysis, ?G°' = 2183.6 kJ/mol. How is this possible, when cells are governed by the laws of thermodynamics?
What will be an ideal response?
Trophic levels form the basis of food chains and food webs. Thoroughly discuss and give examples of the four trophic
levels plus decomposers. Use a specific ecosystem (such as the desert, forest, etc.) to show the relationships between the various levels. Make sure you use real plants and animals as examples. What will be an ideal response?