If plants are grown in the light with CO2 containing heavy oxygen (18O), subsequent analysis will show that 18O incorporated in organic molecules first appears in If plants are grown in the light with CO2 containing heavy oxygen (18O), subsequent analysis will show that 18O incorporated in organic molecules first appears in photosystem II the thylakoid membranes. the stroma. the chloroplast intermembrane space. the thylakoid space.

9. wind power creates pollution. water air soil noise

Keeping in mind the life cycle of bacteriophages, consider the following problem: during the reproductive cycle of a temperate bacteriophage, the viral dna inserts into the bacterial chromosome where the resultant prophage behaves much like a trojan horse. it can remain quiescent, or it can become lytic and initiate a burst of progeny viruses. several operons maintain the prophage state by interacting with a repressor that keeps the lytic cycle in check. insults (ultraviolet light, for example) to the bacterial cell lead to a partial breakdown of the repressor, which in turn causes the production of enzymes involved in the lytic cycle. as stated in this simple form, would you consider this system of regulation to be operating under positive or negative control?

Describe your dna model. which part do the straws represent? the pushpins? the paper clips and the black dots you made with the marker?