Which of the following occurs to transmit signals from one neuron to another?
a. Electrical signals cross the synapse.
b. An action potential jumps the synapse.
c. ATP starts an action potential in the postsynaptic cell.
d. The presynaptic cell releases a neurotransmitter
D
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Which of the following is used to produce vaccines and antibiotics?
a. recombinant DNA technology b. gel electrophoresis c. genetic testing d. gene therapy
Imaginal discs are:a
found in mammalian cells and control gene activation in mature somatic cells. b. paired groups of undifferentiated cells that are precursors of adult structures in Drosophila. c. found in plant cells and assist in the development of the flower. d. part of the salivary gland of Drosophila. e. found in Drosophila ovary cells and represent inactivated X chromosomes.
Which of the following sex-linked disorders was common among the royal families of Europe, and all of the affected males could trace their ancestry to Queen Victoria of England?
A) fragile X syndrome B) hemophilia C) color-blindness D) Duchenne muscular dystrophy E) None of the answer choices is true.
One strategy used by the petroleum industry to control souring is
a. adding nitrate to stimulate growth of nitrate reducers to outcompete sulfate reducers. b. adding sulfur-oxidizing bacteria to remove the H2S. c. adding O2 to inhibit sulfate reducers. d. both a and b