Approximately how many capillary beds contain flowing blood?
a. 85%
b. 50%
c. 1%
d. 10%
d. 10%
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Folding domains typically range in length from ____________ amino acids
A. 1,000 to 1,5000 B. 10 to 20 C. 200 to 275 D. 50 to 80 E. 25 to 100 or more
Vessel elements must be thinner and shorter than tracheids because they lack the structural integrity to support large angiosperm trees
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.
How do prions enter a host and cause disease?
a. Prions are carried by parasites that transmit the infectious prion particle through bites. b. Pathogenic prions promote the conversion of native prion proteins to cause disease. c. The host organism contains a gene that encodes for the same protein as the prion. d. Both b and c are correct.