Select the correct sequence of animal developmental events.
A. fertilization ? cleavage ? gastrula ? blastula
B. fertilization ? cleavage ? blastula ? gastrula
C. fertilization ? blastula ? cleavage ? gastrula
D. fertilization ? gastrula ? blastula ? cleavage
E. fertilization ? blastula ? gastrula ? cleavage
Answer: B
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Four of the five choices below are innate
immune responses. Select the EXCEPTION.
a. antibody production b. phagocytosis c. complement action d. inflammation e. fever
Birds have scaly feet and lay amniotic eggs. This supports the idea that:
a. reptiles evolved from amphibians. b. birds are the only creatures to ever have feathers. c. birds are endothermic. d. birds evolved from reptiles. e. None of the above.
One of the important inherited defects in the second line of immune defense is a condition called chronic granulomatous disease. What is this disease, and how is it caused?
What will be an ideal response?
The minimum number of mutations that is required before cancer is likely to develop is
_____.
a. one b. two c. three d. four