Laboratory diagnosis of HIV infection is usually made by which of the following?
A) electron microscopy
B) growth of HIV in cell culture
C) growth of HIV in embryonated chicken eggs
D) immunodiagnostic procedures for the detection of antigen and antibodies
D) immunodiagnostic procedures for the detection of antigen and antibodies
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When the first example of a duckbilled platypus was presented for identification, the scientists that received the specimen tried to remove all of its pieces and parts to prove it had been contrived. Indeed, it is an odd creature seemingly made up of spare parts from various classes of animals. The bill of the platypus is not related to the bill of a duck though they seem so similar and evolved to solve a similar environmental pressure (accessing food while in the water). What do we call structures like these bills?
a. homologous b. vestigial c. analogous d. phylogenetic
If our bodies are capable of secondary responses, how do people contract influenza more than once?
a. Memory cells lose their ability to recognize antigens after six months. b. The affinity of antibodies diminishes in the secondary response. c. New varieties of flu virus continuously evolve. d. Our bodies cannot launch a strong enough immune response against the flu virus. e. There are no effective vaccinations for the flu.
Discuss why it is difficult to trace the origins of viruses and why they are important.
What will be an ideal response?
Which of the following would be a function of the sympathetic division?
A) accelerate heart rate B) stimulate the stomach C) stimulate the gallbladder D) constrict the pupils