What is the independent variable, the one manipulated by the experimenters, in this figure?
A. partial pressure of oxygen in the tracheae
B. number of times the spiracles are open
C. number of moth pupae
D. external concentration of oxygen
E. size of each moth pupa
D. external concentration of oxygen
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A bacterial ________ is the nontranscribed region of the DNA to which RNA polymerase binds in order to initiate transcription.
A. promoter B. initiator C. operon D. operator
Answer the following statements true (T) or false (F)
1. The North American Mohave desert is located on the downwind side of the Sierra Nevada mountain range, which creates a rain shadow. 2. The abyssal zone has the highest productivity and biodiversity in the ocean, partially because it is well-oxygenated and stable in temperature. 3. Humans were largely unaware of the medicinal use of many plants until the advent of modern pharmaceutical science. 4. Scientists have already observed significant range shifts as a result of climate change. 5. Political and economic pressures typically make habitat preserves larger, making it easier to set aside areas large enough to maintain biodiversity.
Edema is a result of increased interstitial fluid in various tissues of the body. All of the following are causes of edema EXCEPT
A. injury to a limb. B. liver disease. C. abnormally low blood pressure. D. pregnancy. E. protein malnutrition.
Which process is similar to binary fission?
A. genetic variation B. crossing over C. meiosis D. mitosis