In class switching in the secondary antibody response, the most common antibody switch is from
A) IgA to IgD.
B) IgD to IgE.
C) IgM to IgG.
D) None of the answers are correct.
Answer: C
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Transformation has been observed in only a limited number of species in nature, but we have found ways to force the process upon other species in the laboratory.
Answer the following statement true (T) or false (F)
Which of the following layers of the digestive tract is the only one that has direct contact with food
before it is digested? a. serosa b. longitudinal muscle c. mucosa d. submucosa e. circular muscle
Homologous structures, such as arms, wings, and fins, are constructed from the same basic bones and are adapted to locomotion in different environments. Which idea do such structures support?
a) inheritance of acquired traits b) descent with modification c) tendency toward perfection d) artificial selection
Some bacteria exhibit a primitive form of behavior in that they can sense the properties of their environments and use that ability to make adaptive responses. Which of the following are NOT capabilities of any known bacterium?
A. respond to light with the aid of flotation devices B. respond to other individual bacteria and transmit DNA via conjugation C. move to other bacteria and aggregate with them in response to chemical signals D. orientation with respect to the Earth's magnetic field E. none of the other options presented