Regulatory proteins bind to the ____ of a gene operon
a. transcription unit only
b. promoter only
c. operator only
d. transcription unit and promoter
e. operator and promoter
ANSWER: c
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The structure labeled as 2 in the accompanying figure is the:a
endoderm layer. b. mesoderm layer. c. blastopore. d. blastocoel. e. archenteron.
A response an animal develops to a stimulus as a result of pleasant experiences occurring each time the stimulus is received is a kind of learning called
A. insight. B. instrumental learning. C. habituation. D. classical conditioning.
Which germ layer gives rise to the muscle layer of the uterus?
A) Endoderm B) Ectoderm C) Mesoderm
The movement of oxygen through the aquatic plant may depend on
A. aerenchyma tissue. B. differences in the water potential of different tissues. C. negative pressures created by transpiration. D. aquaporins. E. osmotic absorption by the roots.