Our cells are continually moving things in and out. When this happens without the expenditure of cellular energy, with the concentration gradient, we call this passive transport. If the movement of molecules or ions requires a protein channel of some sort, it is called
facilitated transport, still requiring no energy.

Glucose o2 h20 ATP

Pls help

Name the plastid and pigment likely to be found in the cells of (a) petals of sunflower (b) ripe tomato.

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?

What substance is the most acidic. lemon juice. tomato juice. sodium hydroxide. water