The diagram provides a useful model to illustrate which of these statements about gene expression? A. Transcription factors control gene expression by binding to regulatory sites of DNA.
B. Transcription factors control gene expression by altering the nucleotide sequence of DNA.
C. Cells use epigenetic mechanisms to control gene expression without changing DNA.
D. The histones of chromatin, instead of DNA, may be transcribed during gene expression.

In 1992, hurricane andrew left a wake of destruction through florida. one victim of the storm was a reptile-breeding facility. over 900 burmese pythons were set free, and today thousands of pythons live in florida. these pythons are an invasive species, or a harmful species not native to the region. 1. what impacts do you think the burmese pythons might have on local ecosystems

In which of the following relationships is one organism always benefited while the other organism is always harmed

Aspecies has evolved an asexual mode of reproduction by having offspring develop from unfertilized eggs. which of the following will be true of this species' response to natural selection? there will be more deaths from natural selection because there is no mutation. there will be less genetic variation from recombination and a risk of not adapting quickly to environmental change. the species will increase in numbers because genetic variation is increased. the species will compensate for loss of genetic variation by hybridizing with other species. there will be fewer deaths from natural selection because sexual recombination always leads to extinction.