Ib biology duh
| Front | How did the Hershey chase experiment prove DNA was the genetic materiel? |
| Back | a. experiment is meant to determine whether DNA or protein is the genetic material b. viruses/bacteriophages grown in radioactive S/S35 which enters the protein coat c. viruses/bacteriophages grown in radioactive P/P32 which enters the DNA d. «radioactive» viral DNA entered the bacterial cell during infectionOR«radioactive» viral protein did not enter the bacterial cell during infectionRemember the pellet and supernatant stuff |
| Front | Why do plant's need root pressure? |
| Back | When transpirationis insufficent due to high humidity or in spring when leaves of deciduous plants haven't opened so water can't escape through stomata not generating the negative potential |
| Front | Why is it easier for small organisms to exhange gas than bigger organisms? |
| Back | Small organisms have a large SA to V ratio therefore more cells are directly in contact with the environment so they can exchange gas easilyBigger organism have a small SA to V ratio So cells are mostly far from the environment so they cannot exchange gases easily with the environment so they can't exchange enough gas from the environment to respiring cells (Oxygen and CO2) so it needs a gas exhange system |