Among animals, viviparity may be found in (select all correct choices):
A. mammals.
B. reptiles.
C. sharks.
D. insects.
E. birds.
A,B,C
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What early evidence of continental drift was capable of being analyzed to determine ages of crusts?
a. Earthquakes b. Ridge temperatures c. Hydrothermal vents d. Core samples
Rous sarcoma virus was identified when a scientist discovered that a virus passing between chickens was causing their tumors. The genome of this retrovirus includes the src gene, which encodes a tyrosine kinase that functions in signaling pathways leading to proliferation. The src gene is a
A) cyclin. B) proto-oncogene. C) reverse transcriptase. D) tumor-suppressor gene.
What is the principal substance that mediates phototropism in stems?
a. auxin b. gibberellin c. abscisic acid d. ethylene e. cytokinin
Which kingdom is correctly described?
A. Protists: unicellular and heterotrophic only B. Plants: multicellular and photosynthetic C. Animals: multicellular and saprotrophic D. Fungi: unicellular and photosynthetic