How do prions, which are misfolded proteins, infect organisms?
a) Prions only arise through spontaneous mutation. They are not transmissible.
b) Prions recruit ribosomes to make more copies of the wrong form of the protein.
c) Prions enter brain cells and cause normal forms of the protein to refold into the prion form.
d) Prions enter brain cells through the lymphatic system and make copies of themselves.
e) None of the above.
Ans: c) Prions enter brain cells and cause normal forms of the protein to refold into the prion form.
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A. lipids B. carbohydrates C. inorganic compounds D. methane gas and alcohols
Iatrogenic CJD has been transmitted by all of the following EXCEPT
A. grafts of dura mater. B. human growth hormone. C. corneal grafts. D. liver transplants.
The type of system depicted in Figure 44-1 is:
a. an open circulatory system.
b. a vertebrate circulatory system.
c. a closed circulatory system.
d. a lymph system.
e. an open digestive system.
Which two alleles a person has for a particular trait is their _______
Fill in the blank(s) with the appropriate word(s)