When a muscle fiber is relaxed, myosin cannot bind to actin because ____
a. ATP is not present
b. the myosin binding site on actin is blocked
c. the myosin head is in the wrong shape for binding
d. the actin is in the wrong orientation for myosin binding
e. the myosin head is 180 degrees from its attachment configuration
ANSWER: b
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The repressor is bound to the lac operon unless this is present:
a. lactose. b. lactase. c. transcription factor. d. RNA polymerase. e. promoter.
The scientist(s) given credit for formulating the "cell theory" is/are
A. Rudolf Virchow. B. Mathias Schleiden and Theodore Schwann. C. Robert Hooke. D. Louis Pasteur. E. Antony van Leeuwenhoek.
The ability to stand upright and walk on two legs is termed ________
Fill in the blank(s) with correct word
Present a detailed description of the actions of the regulatory proteins in inducible and repressible enzyme systems
What will be an ideal response?