Nitrogen-fixing bacteria convert atmospheric N2 into
A. methane.
B. nitrates.
C. nitrites.
D. ammonium.
E. carbon dioxide.
D. ammonium.
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Answer the following statements true (T) or false (F)
1. r-selected species tend to have type III survivorship curves. 2. Drought and floods are considered to be density-dependent factors potentially affecting population size. 3. In a demographic transition, death rates decline before birth rates. 4. Worldwide human population growth has been exponential since the Industrial Revolution.
What is the difference between ADP and ATP?
a. ADP is located only in the nucleus. b. ADP has no high energy bonds. c. ADP has no gamma phosphate group. d. ADP is made during glycolysis only.
Cystic fibrosis is a genetic disorder that results in mucus build-up in the lungs and subsequent breathing difficulties;
therefore, ____________________ cells would be the target for somatic gene therapy to cure this condition. Fill in the blank(s) with the appropriate word(s).
Which tree species is suffering the largest current tree mortality?
A) trembing aspen B) jack pine C) black spruce D) white spruce