List the four basic principles of genetics that Mendel discovered in his experiments. Briefly describe each of these principles.

Select the true statements about dopamine. A. Dopamine cannot cross the blood-brain barrier. B. Dopamine is an ester. C. L-dopa can cross the blood-brain barrier. D. Dopamine deficiency causes a degenerative neural disorder.

Q4.9. The allele for black noses in wolves is dominant over the allele for brown noses. There is no known selective advantage for one nose color over another in wolves. If this remains true, which of the following statements is most likely true about the change in wolf nose colors over many generations? A. Black noses will become more common than they are now. B. Black noses will stay about the same frequency as now. C. Black noses will become less common than they are now. D. Brown noses will disappear after enough generations pass.

Lab Report: 14 Bacteriophage Specificity 1. What was the purpose of this exercise? 2. Complete the following table with your observations: Name of the bacterium Lysis (yes / no) S. Aureus (+) Yes E. Coli (-) Yes Ent. Aerogenes (-) No 3. How do you know if bacteriophage infected the bacteria? You can see a plaque. 4. Why didn’t the bacteriophage infect all three bacteria? Host Cell Specificity What is the explanation for bacteriophage specificity when it comes to infecting specific bacterium? _________________________ 87

Select the part whose main job is to make proteins. nucleus ribosome smooth endoplasmic reticulum mitochondria

Ducks are aquatic birds. Their feet are webbed and this trait makes them fast swimmers. Biologists believe that ducks evolved from land birds that did not have webbed feet. The amount of webbing on a ducks feet is a heritable trait. While webbed feet were evolving in ancestral ducks, with each generation: a.) Most ducks had about the same amount of webbing on their feet as their parents. b.) Most ducks had more webbing on their feet than their parents. c.) Most ducks have less webbing on their feet than their parents. d.) The amount of webbing on ducks’ feet had no relationship with the amount their parents had.