a student conducts an experience in which she drops objects ,each with a different mass, all from the same height. she uses a stopwatch and records the time it takes for each object to hit the ground. which of the following is the independent (test) variable in her experiment?

The trp operon in e.coli regulates genes that code for enzymes required for synthesis of the repressible operon. when tryptophan is not available amino acid tryptophan. the trp operon is a in the environment, the trp repressor protein activeinactiveregulated. therefore, rna polymerase can bind to the genes to begin transcription.

14. which of the following codons code for threonine? a. ucg b. ugu c. cga d. aca

Which of these is a provisioning service people get from the ocean