In a hypothetical population of 1,000 people, tests of blood-type genes show that 160 have the genotype AA, 480 have the genotype AB, and 360 have the genotype BB. What is the frequency of the B allele?
a. 0.001
b. 0.002
c. 0.100
d. 0.400
e. 0.600
Ans: e. 0.600
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A. elongation B. growth C. division D. wall expansion E. turgor pressure
As the result of exposure to a mutagen, cytosine is substituted for thymine in one strand of DNA. Upon subsequent DNA replication, one of the daughter cells will have a GC pair in this position instead of an AT pair. This is called a(n) ________ mutation.
A. transversion B. frameshift C. insertion D. transition
You try to start your car, but it does not start. Which of these is a prediction?
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Which type of secretion system is commonly used by pathogenic bacteria to inject toxic proteins directly into eukaryotic cells?
a. Sec system b. Type I secretion system c. Type II secretion system d. Type III secretion system