Good luck. challenge your self

How can you keep track of variables in a science experiment?

The current thought on the structure of the cell membrane is: a. a static phosphate sandwich of lipids b. a fluid-mosaic of phospholipids and proteins c. a bilayer of proteins with static lipid molecules d. an impermeable bilayer of protein molecules e. a static and permeable phospholipid single layer

14. which of the following codons code for threonine? a. ucg b. ugu c. cga d. aca