A mutation that changes an amino acid-coding codon to a stop codon is classified as what kind of codon?
A) silent B) missense C) nonsense D) neutral E) conditional
Answer: C
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Describe the problem a marine fish has with water balance
What will be an ideal response?
During an action potential, the membrane potential ____
a. becomes more negative as sodium enters the cell b. becomes more negative as potassium leaves the cell c. becomes more positive as sodium enters the cell d. becomes more positive as sodium leaves the cell e. remains at -70 mV until threshold is reached
In an area with nitrogen-poor soil, legumes often dominate over other plants because they
A) have long taproots that can extract nitrogen from deeper down in the soil. B) inhibit the growth of denitrifying bacteria around their roots, thus keeping more nitrate in the soil. C) have unique access to the large atmospheric pool of nitrogen thanks to their symbiotic bacteria. D) obtain supplemental nitrogen by trapping insects and other prey. E) do not need nitrogen at all.
A graduate student is studying the feeding behavior of a small octopus that must be laboriously collected from the shores of a remote island. Her intern wishes to do experiments to look at the octopus's mating behavior. Why might the graduate student veto this idea?
A. The octopus has iteroparous reproduction, and will eat its mate. B. The octopus has semelparous reproduction, and will die after laying one batch of eggs. C. The octopus has semelparous reproduction, and will eat its mate. D. The octopus has iteroparous reproduction, and will die after laying one batch of eggs.