which of the following statements about enzymes is NOT true?
A. enzymes work best at a specified pH
B. all enzymes have the same shape as their substrates.
C. enzymes are proteins
D. the shape of an enzyme allows it to do its job.
im pretty sure its A. Am i right?
http://www.jiskha.com/display.cgi?id=1494610993
Which of the following statements about enzymes is NOT true?
a
Enzymes work best at a specified pH.
b
All enzymes are reusable.
c
All enzymes have the same shape as their substrates.
d
Enzymes are proteins.
Yes, you are correct. Statement A is NOT true. Enzymes do have an optimal pH at which they work best, but it is not true that they only work at a specified pH. Enzymes can still function at pH values that are outside their optimal range, although their activity may be reduced.
To determine which statement about enzymes is NOT true, let's analyze each option:
A. enzymes work best at a specified pH: Enzymes indeed work best at a specific pH range. This statement is true, so it is not the incorrect statement.
B. All enzymes have the same shape as their substrates: This statement is incorrect. Enzymes have a specific three-dimensional shape, but it is not necessarily the same shape as their substrates. The enzyme's shape allows it to bind to the substrate and carry out its function, but they may have different structural characteristics.
C. Enzymes are proteins: This statement is true. Enzymes are a type of protein that acts as a biological catalyst, facilitating chemical reactions in living organisms.
D. The shape of an enzyme allows it to do its job: This statement is true. Enzymes have a specific shape that enables them to bind to specific substrates and catalyze chemical reactions.
Therefore, the answer to your question is B. All enzymes have the same shape as their substrates. This statement is not true.