How do amino acids like hydroxylysine and thyroxine, which are not among the 20 amino acids that are inserted into proteins, get into proteins
A) Their atoms are altered by insertion into the polypeptide
B) There are more than the 20 amino acids that are said to be inserted into proteins
C) they are inserted directly
D) They are the result of the alteration of R groups of the 20 amino acids before their incorporation into the polypeptide
E) They are the result of the alteration of R groups of the 20 amino acids after their corporation into the polypeptide
Ans: E) They are the result of the alteration of R groups of the 20 amino acids after their corporation into the polypeptide
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Fill in the blank(s) with the appropriate word(s).
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A. Nucleosome location B. Histone activation C. DNA methylation D. Serine to leucine changes in the genetic code
Factors that can alter the level of expression of a gene include
_____ an increase in environmental temperature. _____ an increase in salinity. _____ exposure to UV radiation. _____ presence of a particular energy substrate.
The Earth's surface releases ________ that is absorbed by the atmosphere, stabilizing or raising atmospheric temperature.
A. gamma radiation B. near-ultraviolet radiation C. ultraviolet radiation D. long-wave infrared radiation E. x-rays