Schizophrenia and bipolar disorder are caused by _____
a. one gene, plus environmental triggers
b. the same gene
c. many genes, plus environmental triggers
d. copy number variants, without environmental triggers
e. the same mutations that cause autism spectrum disorders
c
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Hormone X activates the cAMP second messenger system in its target cells. The greatest response by a cell would come from _____
A) applying a molecule of hormone X to the extracellular fluid surrounding the cell B) injecting a molecule of hormone X into the cytoplasm of the cell C) applying a molecule of cAMP to the extracellular fluid surrounding the cell D) injecting a molecule of cAMP into the cytoplasm of the cell E) injecting a molecule of activated, cAMP-dependent protein kinase into the cytoplasm of the cell
Introduced species become invasive when they
A. expand their range and outcompete native species. B. lead to a cost for humans. C. compete with native species without expanding their range. D. move from temperate to tropical settings. E. fill an empty ecological niche.
The kind of vegetation in a tropical rain forest is generally determined by the amount of
A) rainfall. B) organic material in the soil. C) minerals in the soil. D) light.
A __________ is a type of __________ that exactly regenerates the original nucleotide sequence
a. second-site reversion; forward mutation b. second-site reversion; back mutation c. true reversion; forward mutation d. true reversion; back mutation e. substitution; point mutation