Which one of the following statements about the methylation state of CpG islands is incorrect?
A. Cells can heavily methylate CpG islands of
viral DNA sequences in order to restrict their
expression.
B. Cancer cells often methylate CpG islands
in genes that could restrict cell growth.
C. The methylation state of CpG islands
provides a way to turn genes on or off.
D. The methylation state of CpG islands is
rigid and will not change over time.
E. The methylation state of CpG islands can
change in response to the environment.
D
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Oxytocin is stored until released in the posterior pituitary, but it is produced where?
a. thalamus b. pineal gland c. hypothalamus d. anterior pituitary
The smallest particle of an element that still retains the properties of that element is a(n)
A. atom. B. proton. C. electron. D. element.
One of your professors says that fleas jump so high because they have specially adapted leg structures and muscles. But your other professor says that fleas jump high because evolution selected for individuals with genes that helped them avoid being damaged by the scratching behavior of their host. So -- why do fleas jump high?
A. Because evolution selected for individuals with genes that helped them avoid being damaged by the scratching behavior of their host. B. The proximate cause is that they have specially adapted leg structures and muscles, and the ultimate cause is that evolution selected for individuals with genes that helped them avoid being damaged by the scratching behavior of their host. C. The ultimate cause is that they have specially adapted leg structures and muscles, and the proximate cause is that evolution selected for individuals with genes that helped them avoid being damaged by the scratching behavior of their host. D. Because they have specially adapted leg structures and muscles.
What do genes consist of?
A) carbohydrates B) lipids C) proteins D) nucleic acids