In Drosophila, a developmental mutation called ssa (spineless aristapedia) results in flies with mini leg parts on the antennae. What kind of gene is this mutation?
A) gap gene
B) pair-rule gene
C) homeotic gene
D) segment polarity gene
E) maternal effect gene
C
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The highest level of the hierarchy of life is the ____
a. population b. biosphere c. ecosystem d. multicellular organism e. cell
The mechanism of prokaryotic growth, DNA replication, and cell division resulting in two identical
daughter cells is called ____.
a. mitosis b. meiosis c. binary fission d. budding e. zygote formation
One of the most common causes of intellectual disability in the United States is ____
a. congenital rubella syndrome b. cocaine addiction c. fetal alcohol syndrome d. the use of thalidomide by pregnant women e. the use of tetracycline by pregnant women
Which one of the following ions outside the neuron would make it very difficult for a depolarization to occur?
A) potassium B) sodium C) chloride D) manganese