The number of molecules with which an enzyme reacts is the 

A. end product.
B. optimum.
C. substrate.
D. turnover number.


D. turnover number.

Biology & Microbiology

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What is the first step during transcription initiation in prokaryotes?  

A.  the transcription bubble is formed B.  RNA polymerase binds to the promoter C.  the DNA double helix is unwound D.  RNA polymerase synthesizes a short primer E.  transcription factors bind to the TATA box sequence

Biology & Microbiology

The entire set of chemical reactions that sustain life is called ______________

A. metabolism B. catabolism C. anabolism D. hydrolysis E. plasmolysis

Biology & Microbiology

Molecular barcodes are

A. barcodes stamped on vegetables in the supermarket to indicate freshness. B. DNA sequences used to identify and catalog biodiversity. C. radioactively labeled genes used to detect horizontal transfer of genes. D. genetic inversions used to detect crossovers.

Biology & Microbiology

Diffusion of water through a semipermeable membrane is called ________.

A. endocytosis B. active transport C. osmosis D. facilitated diffusion E. diffusion

Biology & Microbiology