Do the results shown in figure 19.5 prove conclusively that histone modifications are causing reduced hnf4a gene transcription? why or why not?
do the results shown in figure 19.5 prove conclusively that histone modifications are causing reduced hnf4a gene transcription? why or why not?
no, because histone modifications do not affect transcription
no, because the results demonstrate only a correlation between altered histone modifications and reduced transcription
yes, because the observed changes in histone modifications are consistent with reduced transcription.
yes, because histone modification is the only regulatory mechanism that could affect transcription

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.

answer-

the statement that f(x) = |x+a| + b has exactly one x-intercept is sometimes correct.

solution-

it solely depends on b, whether the function will have one or two or zero x intercept.

this plot of the given function, f(x) = |x+a| + b will be the basic absolute value graph i.e v shape, with vertex translated to (-a, b), instead of origin.

1-   if b is zero, the graph will have exactly one x-intercept, at x= -a

2- if b is positive, the whole graph will be above the x-axis, hence it will have no x-intercepts.

3- if b is negative, the graph will be below the x-axis, hence it will have two x-intercepts.

∴ the statement is sometimes true.