Which of the following could alter the level of expression of a gene?
A. an increase in environmental temperature
B. an increase in salinity
C. exposure to UV radiation
D. presence of a particular energy substrate
E. All of the choices are correct.
E. All of the choices are correct.
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Heat shock proteins are produced at high numbers to minimize damaging effects during high heat conditions as well as other stress signals unrelated to heat such as ultraviolet radiation
Indicate whether the statement is true or false.
How are processed mRNAs exported from the nucleus to the cytoplasm?
a. Eukaryotic transcription mechanically ejects mRNA from the nucleus. b. After the 5’ cap is added, it migrates to the cytoplasm by diffusion. c. After the poly-A tail is added, it binds to a protein for transport. d. mRNA is released into the cytoplasm when the nuclear envelope dissolves.
In a fruit fly embryo, a homeotic gene Antp determines where legs grow. When the promoter of Antp is mutated, a fly ends up with legs growing out of its head in place of antennae. In this mutation
A. antennae grow where the legs would normally be found. B. Antp must be turned off in all of the fly cells. C. Antp must be turned on in the head. D. the Antp gene, and its transcription factor, and enhancer sequence are turned on in the head. E. the Antp enhancer sequence, or transcription factor, is not functional.
Leaves falling on the ground initially become a part
of soil horizon __________, but will later be a component of soil horizon __________. a. A; B b. A; O c. O; A d. B; A e. B; C