Which of the following is sometimes useful against viral infections?
A. Zidovudine
B. Rifampin
C. Trimethoprim
D. Streptomycin
Answer: A
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Which of the following statements is FALSE regarding CO2 storage in a CAM plant?
A. CO2 is stored as a 4-carbon organic acid. B. CO2 is stored as a result of the activity of PEP carboxylase. C. The storage form is converted to CO2 when sunlight is available. D. CO2 storage allows stomata to be open at night. E. The storage form enters the Calvin cycle as phosphoenol pyruvate.
In comparing the development of the unwebbed foot of the chicken and webbed foot of a duck
A. BMP4 is expressed in the foot of a chicken and gremlin in the foot of a duck. B. BMP4 and gremlin are expressed in both chickens and ducks, but gremlin is expressed throughout the duck leg and not expressed between the toes of chickens. C. BMP4 is expressed in the foot of a duck and gremlin in the foot of a chicken. D. BMP4 is expressed between the toes of a chicken and gremlin between the toes of a duck. E. BMP4 is not expressed in the chicken but is in the duck.
In humans, which receptor is used to primarily detect heat?
A. photoreceptor B. proprioceptor C. thermoreceptor D. mechanoreceptor E. chemoreceptor
The hierarchical system of nomenclature
a. allows diversity to be catalogued. b. organizes knowledge about species relationships. c. permits organisms to be identified. d. sorts organisms into groups. e. all of these.