A new drug interferes with the function of the dendrites of a neuron. What will happen to this neuron?
A) The neuron will die off.
B) The neuron will continuously send signals.
C) The neuron will sometimes send signals and will sometimes not send signals.
D) The neuron cannot be stimulated to send a signal along its axon.
Answer: D
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Which of the following combinations is/are required for the secretion of testosterone?
a. GnRH only b. LH only c. Sertoli cells only d. GnRH and LH only e. GnRH, LH, and Sertoli cells
If an organism's chromosomal DNA is like an instruction manual, what instructions do cells receive from genes?
A) continue growing until the cell can reproduce B) convert carbohydrates into enzymes C) make specific proteins from amino acids D) modify the cell shape for a changing environment
Which of the following is the most plausible explanation for these findings?
(A) A cell surface protein on cell 4 signals cell 3 to induce formation of the worm's intestine. (B) The plasma membrane of cell 4 interacts with the plasma membrane of the posterior portion of cell 3, causing invaginations that become microvilli. (C) Cell 3 passes an electrical signal to cell 4, which induces differentiation in cell 4. (D) Cell 4 transfers genetic material to cell 3, which directs the development of intestinal cells.
The light reactions occur in the ________, while the Calvin cycle occurs in the ________
A) stroma; thylakoid membranes B) stroma; nucleus C) cytoplasm; thylakoid membrane D) thylakoid membranes; stroma