The metal atom bound to the heme group of hemoglobin is
A. sodium.
B. copper.
C. zinc.
D. iron.
E. manganese.
Answer: D
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Chromosomal aberrations:
A. are caused by errors during meiosis. B. are typically only seen in the elderly. C. are usually fixed by DNA polymerase. D. can be caused by methylation. E. are not described by any of the answer
The nitrogen-limitation hypothesis states that organisms select food in terms of the nitrogen content of the tissue. Why might this be true?
A. Animal tissue contains about 10 times as much nitrogen as plant tissue. B. Animals are able to "fix" nitrogen much more effectively than plants. C. Herbivores prefer plants with lower nitrogen content. D. High nitrogen levels are a key part of plant chemical defenses. E. Plant tissue contains about 10 times as much nitrogen as animal tissue.
Ciprofloxacin is used to treat viral respiratory infections.
Answer the following statement true (T) or false (F)
Consider the statement “biological systems interact.” What does this mean?
a. Systems combine to reproduce. b. Biological organisms are interdependent. c. Structure and function are not interrelated. d. Biological organisms are not interdependent. e. Every organism is in conflict with other organisms