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a DNA base sequence is A T G C C G. the sequence of bases in a strand of mRNA transcribed from this sequence of bases in DNA would be
U A C G G C
if a toxic drug inhibited mRNA synthesis, which of the following would be most directly affected?
the movement of substances from areas of high concentration to areas of less concentration
certain cells in the liver ingest bacteria and debris from damaged cells by a process called
the sodium-potassium exchange pump located in the plasma membrane
actively transports potassium into cells
solution A contains 5 grams of sugar per liter while solution B contains 2 grams of sugar per liter. The solutions are separated by a selectively permeable membrane. if the solvent in both solutions is water, predict in which direction most of the water molecules will move
move by osmosis from solution B to solution A
a group of cells was treated with a proteolytic(protein-digesting)enzyme. which of the following processes would be least affected by this treatment
diffusion of lipid-soluble molecules through the plasma membrane
the plasma membrane is selectively permeable. this means
only certain substances can pass through it
what type of membrane proteins have an exposed site on the outer cell surface that can attach to a ligand
fatty acid A has double covalent bonds scattered throughout its carbon chain while fatty acid B has only single covalent bonds between the carbons in its chain
fatty acid B is saturated
solution A has a pH of 10 and solution B has a solution of 2. which of the following statements about these solutions is true
solution B has a higher hydrogen ion concentration than solution A
the presence of water in or bodies allows us to
all of these are correct (cool the body with sweat, maintain a fairly constant body temperature, provide an environment for chemical reactions, and keep tissues moist and reduce friction
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