A toxin interferes with the opening of Na+ channels in the postsynaptic membrane so they open more slowly when
bound to a neurotransmitter. What effect would there be on action potential formation in the postsynaptic membrane?
What will be an ideal response?
ANSWER: This would cause a postsynaptic membrane action potential to form more slowly (if at all),
as well as slow action potential propagation speed.
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A sample of muscle tissue shows large-diameter fibers that are white in color. Which of the following characteristics would also be associated with this tissue?
A. high rates of ATP hydrolysis B. greater resistance to fatigue C. aerobic respiration D. abundant mitochondria E. All of the answer options are correct.
The receptors for many of the hormones involved in the menstrual cycle are found in the cytoplasm
A. true B. false
Which of the following is not part of the mismatch repair (MMR) mechanism?
A. MutS and MutL form a complex at the site of the mismatch and while scanning in both directions along the DNA form a loop. B. Mismatched bases are recognized by MutS. C. When the MutS/MutL complex finds a GATC site, MutH binds to the complex and cleaves the methylated strand. D. Helicase and exonuclease activities unwind and degrade the strand containing the mismatched base. E. Pol III fills the gap and ligase seals the DNA strand.
Paired excretory organs found in most body segments of segmented worms are called ____
a. metanephridia b. parapodia c. septa d. clitella e. setae