Although the membrane of a "resting" neuron is highly permeable to potassium ions, its membrane potential does not exactly match the equilibrium potential for potassium because the neuronal membrane is also _____
A) slightly permeable to sodium ions
B) fully permeable to calcium ions
C) impermeable to sodium ions
D) highly permeable to chloride ions
A
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The results of an experiment
(a) don’t have to be repeatable. (b) should be repeatable by the investigator. (c) should be repeatable by other investigators. (d) must be both b and c.
Why did the authors choose to look specifically for vertebrate mitochondrial genes in their core samples?
A. Only vertebrates eat plants. B. Animal cells do not have chloroplasts. C. Animal cells do not have a nucleus. D. Animals would have been present in Beringia before plants. E. They wanted to distinguish animal mitochondria from plant mitochondria.
Which of the following characteristics do SNPs have?
A) variable numbers of tandem repeats, highly uniform in the population B) small noteworthy transcribed regions, lethal genes C) various nucleotides transcribed repeatedly, homogeneous D) variable amino acid substitutions, highly heterogeneous E) variable base sequences, variable in the population
Which of the following is the part of a flower that contains the female reproductive structures?
A) carpel B) stamen C) sepal D) petal