Chromatin remodeling refers to the process by which:
A. nucleosomes are repositioned to expose
different stretches of DNA to the nuclear
environment.
B. DNA strands are "straightened out" to
allow access to the proteins that carry out
transcription.
C. DNA strands are "unzipped" to allow
access to the proteins that carry out
transcription.
D. methylation occurs in CpG islands.
E. mutations change DNA structure and
therefore chromatin structure.
A
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Compare the flow of energy and the flow of nutrients in ecosystems.
A. Both function in the same way, as both energy and nutrients get recycled in ecosystems. B. Both function in the same way, as both energy and nutrients come in and out of ecosystems. C. Energy is recycled within ecosystems, while nutrients come in and out of ecosystems. D. Energy comes in and out of ecosystems, while nutrients are recycled within ecosystems.
Someone who steps on a sharp nail will quickly lift their foot away. This quick reaction is known as a(n)
_____________________. Fill in the blank(s) with the appropriate word(s).
Why is saltatory conduction faster than continuous conduction? What will be an ideal response?
At which stage of mitosis are chromosomes photographed in the preparation of a karyotype?
A) prophase B) metaphase C) anaphase D) telophase E) interphase