Hydrogen bonds can only occur between certain bases. a always pairs with c always pairs with a- adenine g- guanine c- cytosine t- thymine

Which of the following choices is not an effective solution to the energy waste related to inefficient lighting? a. using low-pressure sodium lighting sources b. pointing lights on billboards and street signs upward c. placing light sources on time controls d. shielding light to direct it downward

Which of the following is a common response to cell signaling?

Which level of taxonomy has the fewest organisms?