Each of the following is true about botulinum toxin (Botox) except
A) The toxin is one of the most potent toxins known.
B) Botox is a SNARE protein.
C) It can be used therapeutically to stop muscle spasms.
D) It has been used to remove wrinkles caused by muscle contractions.
E) It has potential use as a migraine headache treatment.
Answer: B
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All cells have a plasma membrane, cytoplasm, and ribosomes.
A. True B. False
If pregnancy does not occur, ____
a. LH levels rapidly rise b. the corpus luteum degenerates c. estrogen and progesterone levels rise d. the endometrium thickens e. the luteal phase begins
Bristle worms are found primarily in marine environments and characteristically have parapodia. Which class do they belong to?
a. Cestoda b. Oligochaeta c. Hirudinea d. Polychaeta
You are shown a micrograph from a light microscope in which the specimens appear sharply focused and nearly three-dimensional. The micrograph is probably from a(n) ________ microscope.
A. dark-field B. phase-contrast C. Nomarski (differential interference contrast) D. bright-field E. atomic force