What type of selection occurs when a lizard can be small enough to avoid being spotted by a predator or can be large enough to fend off predators?
A. Directional selection
B. Stabilizing selection
C. Disruptive selection
D. Balancing selection
Ans: C. Disruptive selection
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The study of diseases associated with excesses and deficiencies of the immune system is ________.
A. epidemiology B. immunopathology C. humoralpathology D. histopathology E. hemopathology
Which of the following with regard to cancer cells is false ?
A) Growth is not regulated by growth factors. B) The cell cycle is disrupted. C) Most cancer cells die in G1 phase. D) Growth is not stopped by high levels of DNA damage. E) The apoptosis pathway is blocked.
Which of the following statements about Chlamydia is incorrect?
A. Reticulate bodies differentiate into elementary bodies. B. It is an obligate parasite that needs host cells for growth. C. It is gram-negative. D. Elementary bodies are the infectious form. E. Elementary bodies lack enzyme systems for making ATP.
Turbinates were found in therapsids, extinct reptiles thought to be ancestors of mammals. What could the researchers conclude from this observation?
A. Ectothermy arose before fur. B. Ectothermy arose after fur. C. Endothermy arose before fur. D. Endothermy arose after fur. E. Birds did not descend from reptiles.