The presence of AB blood type illustrates the principle of
A) incomplete dominance.
B) codominance.
C) pleiotropy.
D) polygenic inheritance.
Answer: B
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Laboratory strains of E. coli are desirable hosts because
A. it is easy to grow. B. its genetics is well known. C. it is especially able to express foreign genes. D. it has known phenotypic characteristics. E. All of the choices are correct.
In humans, where is the tympanic membrane?
a. in the outer ear, adjacent to the pinna b. deep within the middle ear c. between the outer ear and the middle ear's cavity d. adjacent to the stapes e. between the middle ear and inner ear
An enzyme that catalyzes the movement of DNA transposons
Match the description with the appropriate term.
Redi concluded from his experiment that
A. maggots arise from decaying meat. B. air is a "vital element" necessary for spontaneous generation. C. living things arise from other living things. D. microorganisms are present in the air.