Ulcerative lesions are characteristic of which stage of syphilis?
A) primary stage
B) secondary stage
C) tertiary stage
D) secondary and tertiary stages
E) primary and tertiary stages
Answer: E
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Four of the following maintain genetic equilibrium and allele frequencies. Which one is the exception?
a. lack of gene flow b. large population interbreeding freely c. differential survival and reproduction d. random mating e. absence of mutations
A ________ is a DNA molecule used in hybridization reactions to detect the presence of a particular gene in separated DNA fragments.
A. plasmid B. probe C. blot D. vector
What is the selective advantage for a male to participate in a polyandrous mating system?
A. He is more likely to obtain more mates than if he did not cooperate. B. He cannot outcompete other males for female attention. C. His offspring are unlikely to survive without his parental care. D. He cannot provide any parental care.
Replication
What will be an ideal response?