If a person uses Percocet, a morphine relative, to which of these drugs might that person develop cross-tolerance?
A) ecstasy
B) cocaine
C) heroin
D) marijuana
C
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What is a type of master gene that controls the formation of body parts during development?
a. control gene b. gradient gene c. differentiation gene d. developmental gene e. homeotic gene
A paleontologist estimates that when a particular rock formed, it contained 12 mg of the radioactive
isotope potassium-40, which has a half-life of 1.3 billion years. The rock now contains 3 mg of the isotope. About how old is the rock?
a. 2.6 billion years b. 5.2 billion years c. 1.3 billion years d. 0.3 billion years e. 0.4 billion years
Which organisms are responsible for the majority of photosynthesis?
A) Cyanobacteria B) Flowering plants C) Phytoplankton D) Conifers E) Ferns
Craniosynostosis is a condition in which one or more of the fontanelles are replaced with bone prematurely. Which of the following is not a possible consequence of this condition?
What will be an ideal response?