In this section, you have learned how enzymes act as catalysts for a chemical reaction. enzymes allow chemical reactions to occur a. stronger b. faster c. more often d. slower

Describe your dna model. which part do the straws represent? the pushpins? the paper clips and the black dots you made with the marker?

The hershey and chase experiments involved the preparation of two different types of radioactively labeled phage. which of the following best explains why two preparations were required? a. the bacteriophage used in the experiments was a t2 phage. b. it was necessary that each of the two phage components, dna and protein, be identifiable upon recovery at the end of the experiment. c. each scientist had his own method for labeling phage, so each conducted the same experiment using a different isotope. d. establishing the identity of the genetic material required observation of two phage generations.

The effect of a hormone on a target cell may be decreased by the presence of