A heritable change in nucleotide sequence information that does NOT change the cell's phenotype compared to wild type is NOT technically a mutation
a. True
b. False
Ans: False
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Is cytokinesis the same in plant and animal cells?
a. Yes b. No
What new information was conclusively demonstrated by the Hershey and Chase experiment pictured on the previous slide?
1.DNA contains phosphorous but not sulfur.
2.Prophage DNA was injected into the bacterial cells while prophage protein remained outside.
3.DNA is the genetic material.
4.Protein contains sulfur but not phosphorous.
5.Prophage protein was injected into the bacterial cells while prophage DNA remained outside.
Exposure to which of the following chemicals is correlated with low birth weight and premature birth?
A) the plasticizer di(2-ethylhexyl)phthalate (DEHP) B) bisphenol A (BPA) C) the synthetic estrogen diethylstilbestrol (DES) D) polychlorinated biphenols (PCBs)
Why are action potentials usually conducted in one direction?
A) The nodes of Ranvier conduct potentials in one direction. B) The brief refractory period prevents reopening of voltage-gated Na+ channels. C) The axon hillock has a higher membrane potential than the terminals of the axon. D) Voltage-gated channels for both Na+ and K+ open in only one direction.