A new drug interferes with the function of the dendrites of a neuron. What will happen to this neuron?
A) The neuron will continuously send signals.
B) The neuron cannot be stimulated to send a signal along its axon.
C) The neuron will die off.
D) The neuron will sometimes send signals and will sometimes not send signals.
B
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Sea spiders belong to the subphylum Crustacea
Indicate whether the statement is true or false
After a plasmid has been inserted into a section of DNA and hydrogen bonds have formed between complementary bases, what enzyme ensures the DNA fragments are permanently bonded together with covalent bonds?
a. plasmids b. helicase c. ligase d. restriction enzymes
Researchers applied radioactive phosphorus and radioactive calcium to a freshly cut tree stump. Eight days later, they came back to measure the distribution of the radioisotopes. They found that nineteen different species of shrubs and trees within a seven-meter radius had taken up the radioactive elements. No radioactivity was detected in the air. Radioactive isotopes were never detected in any samples containing just soil taken during the experiment. The finding implies that the
a. soil does not provide the ecosystem with minerals b. isotopes were undetectable in very small amounts c. isotopes were transported via vascular tissues d. plants quickly return minerals to the soil in which they grow e. soil speeds up radioactive decay
A pair of sex chromosomes found in a human male is most like
A) a pair of blue jeans. B) a bride and groom. C) a knife, fork, and spoon. D) identical twins.