Which region of a structural gene contains the information that specifies an amino acid sequence?
A. promoter region
B. transcribed region
C. terminator
D. regulatory sequence
E. enhancer region
B. transcribed region
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This is a nucleotide containing molecule that is commonly used to carry electrons in the cell.
A. ADP B. ATP C. NAD+ D. pyruvic acid
What happens during depolarization?
A. Potassium ions flow out of the cell. B. Sodium ions flow into the cell. C. The sodium/potassium pump protein reverses itself. D. Potassium ions flow out of the cell AND sodium ions flow into the cell.
The tough outer covering of the eye is referred to as the
A. pupil. B. retina. C. sclera. D. fovea. E. iris.
What role did cyanobacteria play in shaping Earth’s environment?
a. They are single-celled organisms that are detritivores. b. They produced oxygen, which led to changes in Earth’s atmosphere. c. They evolved into the first plants that colonized land. d. They are the ancestral form of all life on Earth