Explain the presence and function of the IgA class of antibodies.
What will be an ideal response?
IgA antibodies are found in body secretions such as saliva and milk. Their function is to prevent pathogens from attaching to epithelial cells in the digestive and respiratory tract.
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The Lac repressor:
A. binds to the Lac promoter. B. only binds specifically to DNA. C. functions as a dimer. D. functions as a tetramer. E. prevents bending of DNA.
Habituation is a form of learning in which the subject:
a. continuously produces a certain kind of behavior in the presence of sign stimulus b. fails to make a response when the sign stimulus is presented for the first time c. produces fewer responses to a stimulus that is repeated several times in succession. d. strongly reacts to a stimulus when it is presented after a long period of time has passed
Coevolution is
a. where each species is a selective agent that shifts the range of variation in the other b. random association between two individuals that allows similarity patterns to emerge. c. resource partitioning between two related species. d. mutualistic associations and commensalism. e. none of these.
Which of the following statements regarding transcription is FALSE?
a. Transcription starts at the DNA template corresponding to the 5? end of the mRNA. b. Transcription starts at the DNA template corresponding to the 3? end of the mRNA. c. Transcription starts at the 3? end of the template DNA. d. Transcription happens in the 3? to 5? direction of the template DNA e. Transcription occurs in the 5? to 3? direction of the RNA.