Some protists, like the paramecium pictured, live in freshwater. paramecium have contractile vacuoles, which act to pump water out of the cell. why? a. there is a lower solute concentration inside so water is moving into the cell constantly b. there is a higher solute concentration inside so water is moving into the cell constantly c. there is a lower solute concentration inside so water is moving out of the cell constantly d. there is a higher solute concentration inside so water is moving out of the cell constantly

1. environmental factors, such as ph and temperature, can affect the function of an enzyme. a. true b. false 2. which of the following is an organic molecules (ex. vitamins) that an enzyme? a. coenzyme b. product c. active site d. substrate 3. how do enzymes effect the speed of a chemical reaction? a. they speed it up b. they slow it down c. they have no effect on the speed of a reaction 4. during a chemical reaction, an enzyme is used up so that it can only be used one time. a. true b. false 5. which of the following results from a chemical reaction that is catalyzed by an enzymes? a. active site b. product c. substrate d. coenzyme

Models are non-visual ways of coummincating how someone thinks about something in the natural world

Johnny rode his bike 4 blicks down the street to his friend's house once he got to his friend house and realized he could not cone out to play he turned aroubd and went back home. what is displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point