How do radioactive isotopes differ from isotopes?
A) Radioactive isotopes have more neutrons than do isotopes.
B) Radioactive isotopes are stable; isotopes are unstable.
C) Radioactive isotopes have fewer neutrons than do isotopes.
D) Radioactive isotopes are unstable; isotopes are stable.
D
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DNA
a. is one of the adenosine phosphates. b. is one of the nucleotide coenzymes. c. contains protein-building instructions. d. translates protein building. e. is single-stranded.
The neurotransmitter _____________________ functions in the areas of the brain associated with mood, attention,
arousal and memory, and is associated with nicotine addiction. Fill in the blank(s) with the appropriate word(s).
ISO membranes are inside-out membrane vesicles used by researchers in membrane studies. As a molecule diffuses into the vesicle, it will encounter the layers of the membrane in the following order
A) tail-head-head-tail. B) head-tail-head-tail. C) tail-head-tail-head. D) head-tail-tail-head. E) head-head-tail-tail.
Where do transcription regulators usually bind on a DNA double helix?
A. 5' end B. minor groove C. major groove D. single-stranded regions E. 3' end