In the prokaryotic lac operon system, a repressor remains bound to the ____ unless lactose is present
a. operators
b. promoter
c. enhancer
d. operon
e. gene
a
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Larval development of helminths occurs in which host?
A. Larval development takes place in all hosts. B. Definitive host C. Primary host D. Transport host E. Intermediate host
Creating transgenic animal models for human disease research allows scientists to study new drugs and treatments in animals such as mice, before giving these drugs to humans
a. True b. False Indicate whether the statement is true or false
Ivan Pavlov rang a bell whenever he fed a dog, and later the dog salivated at the sound of the bell. What term best describes this experiment?
a. classical conditioning b. habituation c. operant conditioning d. imprinting e. social learning
Which phase of mitosis is a "preparatory" step involving the development of spindle microtubules?
A) Anaphase B) Prophase C) Metaphase D) Telophase