Catalase is an enzyme found in liver. It is used to break down hydrogen peroxide, a waste product produced by cells. Determine what characteristic of an enzyme is exhibited in the following scenarios when 5 drops of water are placed on a piece of liver, nothing happens. Later 5 drops of hydrogen peroxide are
placed on the liver, and it forms lots of bubbles.
A. optimum pH
B. Optimum temperature
C. Reusable
D. Specific substrate

Drag each label to the correct location on the image. each label can be used more than once. a scientist introduced mutations in a gene sequence isolated from bacteria. study the sequence, and identify the steps where the mutations may affect the formation of proteins. in the sequence, black letters stand for protein coding regions and red letters stand for noncoding regions. protein will not be changed. protein may be changed. attcgtgttc atcgtgttc atcgtattc attcgtattc

Next pretest: evolution select the correct answer in a laboratory population of flies, the female flies are gray and the males are yellowish gray. biologists observed that all the male flies had an equal chance for reproduction, but the male flies with the brightest colors were more likely to successfully reproduce. what phenomenon could explain such a change? a sexual selection b. disruptive selection c. stabilizing selection d. directional selection

Acceleration is a direct result of a.) balanced forces b.) unbalanced forces c.) gravity d.) velocity hurry!