Which of the following is NOT true of enzyme
behavior?
a. Enzyme shape may change during catalysis.
b. The active site of an enzyme orients its substrate
molecules, thereby promoting interaction of
their reactive parts.
c. All enzymes have an active site where
substrates are temporarily bound.
d. Each enzyme can catalyze a wide variety of
different reactions.
e. Enzyme activity is affected by pH and
temperature.
Answer: d
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Fill in the blank(s) with correct word
The embryo is recognizable as human and is called a
fetus at the end of which week of pregnancy? a. ninth b. twelfth c. sixteenth d. twentieth e. twenty-fourth
Transcription factor proteins contain regions called ______ that have specific functions
Fill in the blank(s) with the appropriate word(s).
What is the main problem that results in autoimmune diseases?
A. Macrophages are not working. B. The body fails to distinguish between self and nonself antigens. C. Helper T cells are not functioning correctly. D. There is too much IgD in the blood. E. The memory T cells fail to respond for subsequent exposures to antigen.