Facilitated diffusion across a biological membrane requires ________ and moves a substance ________ its concentration gradient
A) energy and transport proteins; down
B) transport proteins; down
C) energy and transport proteins; against
D) transport proteins; against
Answer: B
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Use the principle of parsimony and molecular genetic data to choose a phylogenetic tree for your hypothesis of how the species were derived from the ancestor.
A. Tree 1 requires the most mutations therefore it would be the best choice.
B. Tree 2 requires 4 mutations while Tree 1 requires 6 mutations therefore Tree 2 would be the best choice.
C. Tree 2 requires the least mutations, therefore it would be the best choice.
D. Tree 2 requires 5 mutations while Tree 1 requires 7 mutations therefore Tree 2, with the least mutations, would be the best choice.
E. Tree 1 requires 7 mutations and Tree 2 requires 4 mutations, therefore Tree 2 would be the best choice.
Explain why a frameshift mutation can have such devastating effects. What will be an ideal response?
How does a longer alimentary canal (digestive tract) create an advantage in processing plant material?
a. Increased time of digestion allows for more processing. b. More volume means more food can be consumed. c. It creates positive feedback for decreased enzymatic activity.
Most gastric ulcers are caused by
A) overuse of aspirin and/or ibuprofen. B) excessive mental stress. C) bacteria. D) overconsumption of alcohol.