Which of the following is used by loggerhead turtles as a guide for navigation?
a. gravity
b. odors
c. magnetic fields
d. temperature
e. stars
c
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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.
Totipotent human stem cells can apparently be obtained only from:a
bone marrow. b. umbilical cords. c. cancer patients. d. zygotes. e. gametes
Underground water supplies within porous rock are called ________
A) chambers B) watersheds C) aquifers D) wasserlagen
The autoclave uses pressurized steam at high temperature for sterilization
a. true b. false