Which statement is true of enzymes? choose 1 (choice a, checked)
a
enzymes work independent of substrate concentration.

(choice b)
b
the activity of an enzyme might change as ph changes.

(choice c)
c
changes in temperature do not affect enzymes.

(choice d)
d
enzymes are non-specific.

The answer is B. Enzymes have optimum temperatures, and are very specific. If substrate concentration is 0, enzymes will not work.

micro/nanoscale topography surface exhibits many prominent properties and is extensively employed in biomedical device, microfluidic device and energy device fabrication. additionally, the clinical applications of biomaterials can be largely expanded with of nanostructured surfaces.

your answer is "the 1950's"