Why are donkeys and horses considered different species?
A. Their offspring cannot produce offspring.
B. There are differences in their RNA.
C. They look different.
D. They have different life spans.
E. There are differences in their DNA.
Answer: A
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Genes whose expression (or abnormal expression) causes cancer are called
A. carcinogens. B. oncogenes. C. cancer genes. D. progenes.
Nitrogen supplies to atoll coral reefs are thought to come from all except
a. nitrogen fixing bacteria. b. planktonic cyanobacteria wind-driven to the reefs. c. re-cycling by fish fecal material. d. runoff from land.
The cell junction labeled “B” in the figure
a. prevents movement of materials between cells. b. allows passage of a signal to contract heart muscles. c. allows the free passage of materials between cells. d. is found mostly in stomach tissue. e. is found in most tissues except heart muscle.
A piece of petrified wood was once part of a living organism that has had its tissues replaced by minerals. Which property of life will still be present in the wood?
a) response to stimuli b) organization c) growth and reproduction d) metabolism e) homeostasis