What would happen if activation energy barriers didn't exist?
A) Substrates would not bind properly to enzymes.
B) Chemical reactions in the body would never occur.
C) Coenzymes would not work, but enzyme function would not be affected.
D) All chemical reactions in the body would proceed whether they were needed or not.
D
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A gene that is knocked out is _____
a. deleted b. inactivated c. expressed d. deleted or inactivated
Which one of the following is found directly beneath the cells of an epithelial tissue?
A) fibrous connective tissue B) basement membrane C) collagen and elastic fibers D) bi or multipolar extensions E) muscle tissue
Which of the following control measures is NOT used to prevent healthcare-associated infections?
A) aseptic technique B) frequent handwashing C) increased use of antibiotics D) education of staff
The chromatin is
A) a liquid filling the nucleus. B) the entry and exit point for material into and out of the nucleus. C) a collection of DNA and protein. D) the site where ribosomal subunits begin their development. E) an organelle which is continuous with the nuclear envelope.