In prokaryotic genes, some repressor proteins block transcription. a repressor can block transcription by binding to which of the following?

19. a cell is viewed under a microscope and is found to have two nuclear envelopes and spindles that appear to be breaking apart. which phase of mitosis is the cell most likely in? a. metaphase b. prophase c. telophase d. anaphase

What factors contribute to the effect an environmental toxin has on the human body?

Based on the diagram, which of the following best describes ways in which the physical appearance of h. neandertalensis and h. sapiens differ?