The gene of an operon that codes for a protein repressor is called the
A) Operator
B) Regulator
C) Promoter
D) Structural locus
B) Regulator
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What is the composition of the tunic that covers the outer body of urochordates?
a. protein b. calcium c. carbohydrate d. cholesterol
The most widely accepted model for the evolution of modern humans is pictured here. What is this model called? 
A. Out-of-Africa and Replacement Model B. Hardy-Weinberg C. Multiregional continuity D. Replacement Model E. Out-of-Africa
Which of the following is the major sign or symptom of mumps?
A) diarrhea B) nausea and vomiting C) deafness D) parotitis E) difficulty in breathing
You are conducting a genetic screen using Caenorhabditis elegans embryos to isolate mutations affecting anaphase (A). Therefore, you need to look for embryos in which
A. the centromeres do not move toward the poles. B. the poles do not move apart. C. the spindle apparatus does not disassemble. D. sister chromatids are mismatched and therefore fail to separate.