Enzymes function as catalysts by
A. bringing the substrates together at the active site correctly oriented for the reaction.
B. bringing the substrates together at the active site, in effect concentrating them.
C. bringing the substrates together at the active site, in effect concentrating them and bringing the substrates together at the active site correctly oriented for the reaction.
D. None of the choices are correct.
Answer: C
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Most mutations that affect developmental regulatory genes are ________________.
Fill in the blank(s) with the appropriate word(s).
Procedures such as grinding, mincing, vortexing, and preparing smears:
a. are hazardous and should be performed while wearing gloves and gown protec-tion. b. create aerosol droplets and should be per-formed only in an approved biosafety cabinet. c. should be avoided with specimens known to contain infectious agents. d. produce a spill hazard and should be per-formed over an absorptive mat.
How does a cell typically know when to divide?
A) Cells have an internal clock and divide only when they reach a certain age. B) Tumor suppressor genes code for growth factor proteins that initiate cell division. C) Proto-oncogenes code for growth factor proteins that initiate cell division. D) Oncogenes code for growth factor proteins that initiate cell division.
A measure of the ability of a population to grow under ideal circumstances (maximum birth rate and minimum death rate) is its ________
Fill in the blank(s) with correct word