Match each term with its definition.

1) a DNA sequence located near the start of a gene that RNA polymerase binds to initiate transcription
2) a regulatory protein that blocks transcription by binding to the operator site
3) a transcriptional element that blocks the signal between enhancers and promoters
4) a gene that controls the expression of one or more genes by promoting or inhibiting transcription
5) a small molecule that activates transcription by inhibiting the action of a repressor protein
6) a short DNA sequence that can be recognized by a repressor protein

a) insulator
b) operator
c) repressor
d) inducer
e) regulatory gene
f) promoter

The collared lizard is a species found in the desert southwest. male collared lizards show considerable color variation, ranging from brightly colored to a very dull pattern. your goal is to determine the function, if any, of male color patterns in collared lizards, using the scientific method. your tentative explanation is that male color plays a role in attracting females for mating purposes. you predict that females will preferentially choose brightly colored males over dull-colored ones. to test this prediction, you observed the interactions of female collared lizards with their male counterparts. you selected males that were the same age and size, and that differed only in their coloration pattern. you placed equal numbers of the two types of male lizards, bright and dull, in aquariums, along with one female lizard per aquarium. out of 350 aquariums observed, the female chose to mate with the brightly colored male 277 times, and the dull-colored male 70 times. in 3 instances, the females did not mate with either type. create a bar graph of your data, plotting the type of male (dull or brightly colored) on the x-axis. on the y-axis, plot the frequency with which each type of male was chosen by females. using this graph, answer the following question(s). is it reasonable to conclude (i. e., is it supported by the data) that female collared lizards prefer more brightly colored male lizards over dull-colored males?

What is the term for the two sets of chromatids formed in the parent cell a. haploid b. diploid c. gamete d. tetrad

Multicellular organisms use cell division, mitosis, for growth and the maintenance and repair of cells and tissues. single-celled organisms may use cell division as their method of reproduction. regardless of the reason for mitosis, the process ensures genetic continuity. what is the step in the cell cycle that ensure genetic continuity?