A motor neuron and all the muscles under its control are called what kind of unit?
a. end
b. movement
c. muscle
d. motor
e. coordination
d
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Transgenic mice are useful to human researchers because they _____
A) can be valuable animal models of human disease B) are essential for mapping human genes C) are now used in place of bacteria for cloning human genes D) were instrumental in pinpointing the location of the huntingtin gene
All of the following characteristics are shared between plant and animal development except that in animals, but not plants, _____
A) gene expression in developing embryonic tissues is closely regulated B) orientation of cells and tissues is critical for proper development C) differentiation of cells is directed and maintained by cascades of molecular signals D) once animal cells are differentiated, they cannot de-differentiate and redifferentiate
Which nucleotide is added to the end of a completed messenger RNA transcript?
a. adenine b. thymine c. cytosine d. guanine e. alternating adenine and thymine
In the mechanics of conjugation, exclusive of gene transfer, Hfr and F+ strains behave the same.
Answer the following statement true (T) or false (F)