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

Biology & Microbiology

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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.

Biology & Microbiology

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).

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology