Dexamethasone is a drug used to suppress the secretion of adrenocorticotropic hormone (acth) from the anterior pituitary. two patients with hypersecretion of cortisol are given dexamethasone. patient a‘s cortisol secretion falls to a normal level, but patient b's cortisol levels remain high. what is wrong with patient b's endocrine signaling system? relate this human condition to the insect hormone system we discussed in lecture. is patient b's condition similar to the insect system in any way?

Which of the following is true of photosynthesis? a)carbon dioxide is a reactant b)water is a product c)most reactions within this process are exothermic d)oxygen is a reactant

Which is a function of vascular tissue? a. to perform photosynthesis b. to transport water and nutrients c. to absorb minerals and sugar d. to interact with soil fungi

Read this summary of a scientific theory: "cells are the most basic structural and functional units of life. all living organisms are made up of one or more cells. all cells that are alive in the world today came from pre-existing cells." which of the following would require this theory to be modified? -a.) a survey finds that a majority of people believe viruses carry out the basic processes of life. -b.) a prominent scientist says she feels strongly that one day the theory will be challenged by life on other planets. -c.) the dna of unicellular and multi-cellular organisms is shown to have many fundamental similarities. -d.) scientific observations show that microscopic organisms living in the deep ocean are not made up of cells.