Is PSA screening still recommended for healthy men? Why or why not?
What will be an ideal response?
No because screening does not reduce the risk of death from prostate cancer.
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When an action potential begins and sodium channels open, why does sodium rush into the cell? (Check all that apply.)
_____ The inside of the cell is negatively charged. _____ The inside of the cell is positively charged. _____ Chloride ions are waiting to bind to the sodium inside the cell. _____ The diffusion gradient drives sodium into the cell. _____ Channels use energy to move ions across the membrane whenever they are open.
Facilitated diffusion and active transport require a carrier protein to mediate the movement across the plasma membrane.
Answer the following statement true (T) or false (F)
The ultimate source of carbon from which life is constructed is derived from
A) atmospheric carbon dioxide. B) respiration. C) decomposition. D) the consumption of other organisms.
In humans, straight thumbs are caused by the dominant allele T, while individuals who are tt have thumbs that curve backward ("hitchhiker's thumb")
Consider a family in which the father has straight thumbs, and both the mother and their only child have curved thumbs. What is the chance that their next child will have curved thumbs? A) 25% B) 50% C) 75% D) 100%