What feature of tumor-causing Rous Sarcoma Virus (RSV) distinguishes it from ancestral Avian Leukosis Virus (ALV)?
a) RSV genome has lost the viral replication genes that ALV has
b) RSV has an oncogene that ALV does not
c) RSV infection is limited to mammals whereas ALV infects birds
d) RSV causes cancer whereas ALV only induces benign tumors
Answer: b) RSV has an oncogene that ALV does not
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Which of the following gives the correct rank order for relative toxicity (most to least) of the primary nitrogenous wastes used by different animals?
A. ammonia ? urea ? uric acid B. uric acid ? ammonia ? urea C. urea ? uric acid ? ammonia D. ammonia ? uric acid ? urea E. urea ? ammonia ? uric acid
Countries with the lowest GDP per capita have work forces engaged for the most part in
A) primary activities. B) secondary activities. C) tertiary activities. D) quaternary activities.
In bacteria, the small, circular pieces of DNA that are located outside the chromosome are called
A) sex pili. B) plasmids. C) bacteriophages. D) flagella. E) endospores.
Lipids are characterized primarily on the basis of their insolubility in _________
Fill in the blank(s) with correct word