What effects do hypothyroidism and hyperthyroidism have on metabolism? What will be an ideal response?
Concepts to Consider: Hypothyroidism--when there is almost no secretion of thyroid hormones in an
adult, the person has a 40% reduction in basal metabolic rate. This slows down physical and mental
activities. The person may feel sleepy, low in energy, and confused. Hyperthyroidism--when there is
an over secretion of thyroid hormones, metabolic rate can increase by more than 60%. The person
often feels hungry due to a rapid use of nutrients, nervous, emotionally unstable, and irritable.
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Sometimes, the decline of one species threatens the survival of another species. Which scenario is an example of this?
a. declines in polar bears result in diminished prey populations b. the arrival of sailors on Mauritius island led to the extinction of dodo birds c. declines in eagle populations due to the accumulation of pollutants in their eggs d. decline in buffalo caused a drop in native buffalo clover e. pollution led to declines in the Texas blink salamander population
Approximately what fraction of flowering plants is polyploid?
a. 1% b. 10% c. 25% d. 50% e. 80%
Most cases of pharyngitis are caused by Group A ß-hemolytic streptococci
Indicate whether the statement is true or false
The fluid mosaic model of cell membranes was proposed by
a. Frye and Edidin. b. Singer and Nicolson. c. Gorter and Grendel. d. Avery and McLeod.