Please match the diseases with their most common portal of exit.
Gonorrhea
A) Respiratory tract (aerosols)
B) GI tract (saliva droplets)
C) Exudates from skin lesions
D) GI tract (diarrhea)
E) Reproductive tract (semen)
F) Blood through a contaminated needle
E) Reproductive tract (semen)
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Because of hydrogen bonding, water is uniquely suited for its central role in life. Many hydrophilic molecules interact freely with water, but there are a number of hydrophobic molecules important for life, too
How does the interaction between water and hydrophobic molecules help to organize biological systems? A. Because cells are not pure water (they have many substances dissolved within them), the hydrophilic/hydrophobic effect has little role in biological organization. B. The ionic bonds between water cause hydrophobic molecules to associate with one another and not with water molecules. C. Because water molecules preferentially associate with one another, they force hydrophobic molecules to associate with one another and not with water molecules. D. None of the above
An avid gardener composts her wastes near the back of her property, away from her house. She moved the compost heap out there because it sometimes heats up enough to smoke. When asked why it heats up so much, she answers, simply, “Because the second law of thermodynamics says so!” How does the second law of thermodynamics explain her compost smoking?
a. Gardeners will often set their compost heaps on fire first to accelerate the rate of decomposition. According to second law of thermodynamics, ash and carbon form and smoke is given off. b. The second law of thermodynamics says that energy in a system is always increasing. This increase in energy includes the energy in compost heaps. As the energy increases, heat is produced. c. The breakdown of compost involves a transformation of energy from chemical bonds in the decomposing organic matter. The second law of thermodynamics says that there is no 100% energy transfer, so some of the energy is lost to the surroundings as heat. d. The gardener is incorrect and her garden compost heap has nothing to do with the second law of thermodynamics.
Four of the five answers listed below are macronutrients. Select the exception
a. phosphorus b. sulfur c. nitrogen d. copper e. magnesium
Which of the following is a nematode worm that has been used as a model organism in genetics?
A) Drosophila melanogaster B) Mus musculus C) Arabidopsis thaliana D) Caenorhabditis elegans E) Homo sapiens