"The attenuation mechanism that helps block expression of the tryptophan" operon would include all of the following, except A. mRNA transcript of the trp leader sequence B. a ribosome stalled at the stop codon of the trp leader transcript C. formation of an attenuator loop D. high intracellular levels of charged tryptophan transfer RNA molecules E. No exceptions; all are required

The table below shows the number of foot bones in some horse fossils.horse fossil recordhorse fossil number of foot bonesp 19q 17r 24s 13ancient horses had more bones in their foot then present-day horses. the present-day horse has 11 foot bones. what is the correct order of evolution of the horse starting from the youngest fossil? a. q p r s b. s r p q c. s q p r d. r p q s

Acar company is testing seatbelts using crash test dummies. the company finds that when cars come to a sudden stop, the crash test dummies' bodies continue to move forward. the seat belt keeps the crash test dummies from hitting the back of the seat in front of them. why do the crash test dummies' bodies continue to move forward even though the car stopped? a. the friction opposing their bodies' movement keeps them in motion. b. the inertia of their bodies keeps them in motion. c. the forward acceleration of the car keeps them in motion. d. the gravity pulling on the car keeps them in motion.

Compare the composition of the moon's surface with the composition of the earth's surface.