Which of the following statements concerning enzymes is false? a) they are usually, but not always, proteins. b) they function best at 37°c. c) they can be denatured if the ph of their environment is too high or too low. d) they form a temporary intermediate compound with a substrate. e) they can be used to catalyze a chemical reaction over and over again.

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his 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

Under the soviet system, the government a. controlled all forms of communication. b. allowed newspapers to print whatever they wanted. c. controlled editorials but not the reporting of news. d. encouraged access to a wide variety of news sources. select the best answer from the choices provided a b c d

Aquaternary consumer species would be expected to have a smaller population than a secondary consumer species. select the best answer from the choices provided t f