Scientists once thought that the pituitary gland was the regulatory center of the endocrine system. they now think that a structure in the brain, the hypothalamus, acts as this regulatory center. which of the following does not provide information supporting this new conclusion? the hypothalamus can send nerve signals to other parts of the brain. the hypothalamus produces and secretes hormones. hormones produced by the hypothalamus stimulate or inhibit the release of other hormones by the pituitary gland. blood vessels that connect the hypothalamus with the pituitary gland have been found.

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.