Suppose you check the results of your PCR reaction by running the products on a DNA agarose gel (see an explanation of DNA electrophoresis on the next page). After doing so, you discover that there are no bands present (i. e. no products were produced from PCR). How could you explain this result?

Which statements correspond to cellular respiration? co2 diffuses passively into the cell. co2 diffuses passively out of the cell. co2 must be pumped out of the cell. o2 diffuses passively when produced inside the cell. o2 diffuses passively when converted to co2. o2 is pumped in and forces co2 out.

Which of the following is most important in making the typical seed more resistant to adverse conditions than the typical spore? a) a different type of sporopollenin b) an internal reservoir of liquid water c) integument(s) d) ability to be dispersed e) waxy cuticle

The third stage of cellular respiration is (2 points)