In E. coli cells, maltose, a type of sugar, is needed to turn on the genes that are regulated by the mal operon. This type of regulation is called (1 point) positive control

negative control

operon control

repressor control

What material did the moon come from?

Cladistics is a way of classifying organisms by examining the characteristics of their ancestors and descendants and depicting the relationships in a cladogram. which of the following best describes a challenge in classifying organisms this way? a. there are millions of species on earth, and a cladogram is not a practical means for classifying all of them. b. it is impossible to tell which organisms are most closely related to each other using a cladogram. c. cladograms are detail-oriented and do not provide a useful understanding of evolutionary relationships. d. there is a limited number of ways to organize the information, so most cladograms end up looking very similar.

Vessels draining the myocardium of the heart, open primarily ,into which chamber?