Viruses are sometimes classified by the organisms they infect. In fact, the first virus discovered only infects a particular plant. What was this first known virus?
a. leaf curl virus
b. potato gall virus
c. tobacco mosaic virus
d. Dutch elm disease
c. tobacco mosaic virus
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In negative control of transcription, how does the presence of an inducer affect transcription?
A) The inducer binds to the operator. B) The inducer does not bind to the operator. C) The inducer causes the repressor to bind to the operator. D) The inducer prevents the repressor from binding to the operator.
In the disease myasthenia gravis, there is a deficiency of acetylcholine receptors at the neuromuscular junction. This blocks contraction by preventing muscle activation at which point?
A. generation of action potentials in the motor neuron B. opening of the T-tubule system C. release of Ca2+ from the sarcoplasmic reticulum D. altering the interaction of troponin with tropomyosin E. generation of action potentials in the muscle fiber
Allosteric inhibition is generally a result of:
a. excess substrates b. binding regulatory molecules at a site other than the active site c. a change in the temperature of the system d. binding of the regulatory molecule at the active site e. pH inhibition
The neural tube will develop into the ________
a. brain and spinal cord b. vertebral column c. somites d. legs