Which of the following describes movement of molecules into a cell though active transport? 1. Hydrocarbons dissolve in the lipid bilayer and travel down a concentration gradient
2. Molecules move through passages in the cell membrane that are created by channel proteins
3. Pockets in the cell membrane form vesicles around extracellular material during endocytosis
4. Vesicles carrying large molecules fuse with the cell membrane during exocytosis

As the pea seeds respire, the level of coloured liquid in the left hand part of the capillary tube rises. by referring to what is happening in the apparatus, explain why the level of liquid changes

The process of meiosis produces only gametes, eggs or sperm. according to the diagram, how many sperm are formed from each cell that undergoes meiosis?

What is a difference between systemic and pulmonary circulation? a. systemic circulation carries oxygenated blood to the lungs and pulmonary circulation carries deoxygenated blood to the body. b. systemic circulation carries deoxygenated blood to the lungs and pulmonary circulation carries oxygenated blood to the body. c. systemic circulation carries deoxygenated blood to the body and pulmonary circulation carries oxygenated blood to the lungs. d. systemic circulation carries oxygenated blood to the body and pulmonary circulation carries deoxygenated blood to the lungs.