Which of the insects in the accompanying figure is a flea?
a. 1
b. 2
c. 3
d. 5
e. 6
d
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Someone suffering from anorexia nervosa may experience which of the following physical symptoms? [Select all correct responses]
A. esophageal damage B. teeth erasion C. cessation of mensturation D. decreased thermoregulation E. both C & D
Bayliss and Starling first demonstrated the existence
of hormones when they were studying which of the following? a. thymus b. islets of Langerhans c. bursa of fabricus d. pancreas e. none of the above
Grass flowers lack petals and sepals. Which of the following statements is TRUE?
A) They are incomplete flowers lacking one or more floral parts. B) They are pollinated by flies, which don't require showy, scented petals. C) They are imperfect flowers lacking stamen or carpals. D) These flowers are pollinated at night, so they don't benefit from showy petals or sepals.
Is the lac operon transcribed when lactose is present?
A. Yes, lactose is converted to another sugar that binds to the repressor, freeing the promoter region. B. Yes, lactose binds to RNA polymerase, allowing it to bind to the promoter and transcribe the operon. C. No, lactose is converted to another sugar that binds to the two operators preventing transcription. D. No, lactose has no effect on transcription of the lac operon. E. No, lactose binds to the second operator, blocking transcription by RNA polymerase.