Biology Vocab

4. an organism consisting of a cell or cells in which the genetic material is DNA in the form of chromosomes contained within a distinct nucleus
5. the semipermeable membrane surrounding the cytoplasm of a cell
8. movement of ions and other atomic or molecular substances across cell membranes without need of energy input
9. a membrane allowing certain substances to pass through it but not others, especially allowing the passage of a solvent but not of certain solutes
10. molecules attracted to water
12. fats are made from this molecule
13. two solutions having the same osmotic pressure across a semipermeable membrane
15. solution that has a lower osmotic pressure than another solution
16. protein shell of a virus
17. infectious agent that replicates only inside the living cells of an organism

1. the movement of ions or molecules across a cell membrane into a region of higher concentration, assisted by enzymes and requiring energy.
2. is the process of spontaneous passive transport of molecules or ions across a biological membrane via specific transmembrane integral proteins.
3. a microscopic single-celled organism that has neither a distinct nucleus with a membrane nor other specialized organelles
6. property of a molecule that is seemingly repelled from a mass of water
7. having a higher osmotic pressure than a particular fluid, typically a body fluid or intracellular fluid
11. a thin polar membrane made of two layers of lipid molecules
14. when a substance crosses a semipermeable membrane in order to balance the concentrations of another substance