Iron response elements form:
A. RNA hairpin structures.
B. DNA stem loop structures.
C. poly(A) binding sites.
D. iron reducing clusters.
A
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What has caused this strange result?
A scientist has been growing a bacteria strain for some time in culture media containing very few nutrients. The cells are growing slowly, so she enriches the media with amino acids and carbohydrates. To her dismay, instead of growing faster and to higher densities, the bacteria begin to die. A. A prophage switched from the lysogenic cycle to the lytic cyle. B. A prophage switched from the lytic cycle to the lysogenic cycle. C. The bacteria is infected with a temperate phage. D. The bacteria is infected with a virulent phage, and has switched from the lysogenic cycle to the lytic cycle. E. The bacteria is infected with a temperate phage, and has switched from the lysogenic cycle to the lytic cycle.
The amino acid glycine (C3NO2H6 ) is a(an):
A. element B. organic molecule C. inorganic molecule D. vitamin
An active continental margin is found: a. where the leading edge of a continental crust always subducts
b. within a tectonic plate and on a wide continental margin. c. where the leading edge of a continental crust collides with ocean crust. d. in an area of active erosion and weathering.
Severe neural tube defects in the embryo can
be mostly avoided if the mother takes vitamin
a. D. b. Bs. c. C. d. E. e. K.