The movement of a molecule (other than water) across the plasma membrane from a region of high concentration to one of low concentration is called

Which of the following is a major force that moves water through the xylem tissues of a plant? a. pressure-flow b. transpiration pull c. capillary action d. both b and c

Which type of pyramid shows the amount of living tissue at each trophic level in an ecosystem

What is an organism that lives on or in another organism and derives its nutrition from that organism?

Three species of North American warblers are found to feed in different parts of the same spruce tree. This particular behavior of warblers displays which ecological characteristic?

Why is carbon so important in these molecules

The specialized functions of different membranes are largely determined by the blank they contain. Membrane lipids are blank molecules, composed of a hydrophilic portion and a hydrophobic portion.

Which of the following aren't eukaryotes? plants bacteria animals fungi

In pea plants, smooth pea shape is dominant to wrinkled pea shape. If a pea plant that is true-breeding for smooth pea shape is crossed with a pea plant that is true-breeding for wrinkled pea shape, what will be true of the offspring?

Are atoms completely lost or gain in a chemical re

Epinephrine and norepinephrine that are released from the adrenal glands affect target tissue for a longer period of time than the same substances released from neurons at their peripheral receptors. why?