High levels of which chemical in the sleep centers of the brain induce drowsiness and sleep?
a. norepinephrine
b. serotonin
c. adrenalin
d. encephalin
e. cyclic AMP
B
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How does RNA polymerase II get involved in transcription?
a. It binds directly to the eukaryotic promoter sequence. b. It binds directly to the TATA box. c. It binds to transcription factors in the nucleus, and the complex then binds to the promoter. d. Transcription factors bind to the promoter, and they in turn bind to RNA polymerase II. e. Some transcription factors bind to the promoter, others bind to RNA polymerase II, and then the two groups of proteins bind to each other.
What is haplodiploidy, and how is it related to altruism in honeybees?
What will be an ideal response?
Which group contains the organism Trypanosoma?
a. excavates b. chromalveolates c. unikonts d. archaeplastids e. rhizarians
Monocot leaves typically have:a
alternately palmate venation. b. netted venation. c. parallel venation. d. alternately pinnate venation. e. no venation.