An explanation for the evolution of insect wings suggests that wings began as lateral extensions of the body that were used as heat dissipaters for thermoregulation. When they had become sufficiently large, these extensions became useful for gliding through the air, and selection later refined them as flight-producing wings. If this hypothesis is correct, insect wings could best be described as
A) adaptations.
B) mutations.
C) exaptations.
D) isolating mechanisms.
E) examples of natural
Answer: C) exaptations.
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Riboswitches regulate transcription, rather than translation, in cells.
Answer the following statement true (T) or false (F)
An oncogene is
A. always seen in human cancer cells. B. a mutated form of a proto-oncogene. C. a viral gene with no relation to the host cell's genes. D. a gene that turns off cellular reproduction. E. a bacterial gene that causes cancer in the host.
As stem cell research rapidly developed, it became a political and ethical issue. Describe how the ethical and political approach toward stem cell research has changed in the past decade
What will be an ideal response?
You have been given vials of H2, Na, H2O, Hg, and CH4. What are the majority of your vials filled with?
A. molecules B. carboxyls C. gases D. liquids at room temperature