Adult T-cell leukemia is thought to be caused by ________.

A. herpesviruses
B. picornaviruses
C. retroviruses
D. parvoviruses


Answer: C

Biology & Microbiology

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Which form(s) of nitrogen is(are) unusable by plants?

a. ammonium b. nitrates c. nitrogen gas d. More than one of these answers is correct.

Biology & Microbiology

Methane is produced in manure piles and many other

environments. Which of the following statements is TRUE concerning this alternative fuel? a. High concentrations are collected from pig farms annually. b. It is found in large geological deposits. c. It does not burn with enough energy to be useful. d. It needs an effective collection technique. e. All of these are true.

Biology & Microbiology

Antibiotic resistance genes are often included on plasmid vectors because

A) antibiotic resistance is used to select for bacteria cells containing the vector. B) antibiotic resistance can be used to control the growth of the genetically modified organism. C) antibiotics are often present in humans being treated for disease. D) only bacteria are affected by antibiotics. E) antibiotic resistance genes can be used as transcriptional reporters.

Biology & Microbiology

Of the following, which would be predicted to grow at the slowest rate?

a. yeasts b. lichens c. sac fungi d. mushrooms e. bread molds

Biology & Microbiology