Chemistry and Biology assignment

Term: 2019 Summer

Final-term Exam

Name: ______________________ Time: _______________ Total: _________(100)

I. True or False:(3points each, 30points)

(1) Learning requires activity in the brain but not necessarily consciousness of the activity. ( )

(2) The length of time that a drug remains metabolically active in the body is measured by its full-life. ( )

(3) Drugs have both acute effects and chronic effects. ( )

(4) Health is the ability to return to homeostasis. ( )

(5) Specific immunity can be selectively turned off. This is called development of tolerance. ( )

(6) Pathogens are organisms that cause disease. ( )

(7) Biodiversity is measured by the number and variety of species, of which 60% are either insects or vascular plants. ( )

(8) Habitats support the interdependent lives of biological communities of species. ( )

(9) Sentinel species CNNNOT be used to monitor for pollution. ( )

(10)Because o f the greenhouse effect, increases in carbon dioxide emissions will cause a global warming trend. ( )

II. What type of cell releases histamine? And what’s role of histamine in body? (15points)

III. How do the terms stress and stressor differ? (10points)

IV. When body fluids such as blood are spilled, can cell-free HIV be killed by soap and water? Why or why not? (15points)

V. What is the difference between the terms prevalence and incidence? Under what conditions will prevalence increase if incidence remains the same? (20points)

VI. How many times more H+ ions are there in acid rain at pH 5 than in water at neutral p H? How many times more at pH5 than in ordinary water at pH6? (10points)