Which statement best describes the function that results from the selectively permeable nature of a plasma membrane?
a.
instructions given by a cell nucleus can move throughout the cell more easily.
b.
all substances can easily travel across the membrane, so the cell does not need to expend energy transporting them.
c.
the cell is hard and durable because the membrane does not allow any outside substances to enter the cell.
d.
some substances are permitted to move into and out of the cell, while other substances are not.

What is a traditional chinese touch therapy involving finger pressure applied to specific areas of the body to restore the flow of qi.

In this experiment, the was intentionally manipulated. it is the independent variable. the dependent variables that were measured were the

Aresearcher designed an investigation to test what effect eating different types of food would have on blood insulin levels. she selected 10 male subjects who were all 25 years of age and in good health. the experiment took place over 3 days. at 8: 00 a.m. on each day, the subjects ate a meal consisting of only 1 type of food. they had their blood insulin levels measured after consuming the meal. on day 1 they ate a high fat diet, on day 2 they ate a high protein diet, and on day 3 they ate a high sugar diel what is the independent variable in this experiment? a the age of the subjects b the blood insulin level c the type of food consumed d the time of day the meal was consumed