Bats, birds and dragonflies can all fly. Which of the following groups of animals have some members capable of flights?
A. reptiles, amphibians, and arthropods
B. reptiles and mammals only
C. mammals and arthropods only
D. amphibians and arthropods only
E. reptiles, arthropods, and mammals
Answer: E. reptiles, arthropods, and mammals
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The dinosaurs and many other animals became extinct at the end of the
A) Cambrian period. B) Permian period. C) Cretaceous period. D) Pleistocene epoch.
Which of the following is not a mechanism of differentiation?
A) induction B) inhibition C) apoptosis D) positional information
Which structure of the male reproductive system is also part of the urinary system?
A. testes B. urethra C. bulbourethral gland D. vas deferens E. prostate gland
Cytotoxic T cells eliminate pathogens by
A) releasing chemicals which are toxic to cellular pathogens. B) ingesting and digesting infected or cancerous cells. C) coordinating the activities of other immune cells. D) releasing chemicals which cause infected or cancerous cells to undergo apoptosis. E) ingesting and digesting cellular pathogens.