Prader-Willi (PW) and Angelman syndromes (AS) are imprinting disorders of the same region on chromosome 15. Normally, the genes associated with PW are ________ imprinted (silenced), and the one gene associated with AS is ________ imprinted (silenced)
A) paternally; paternally
B) paternally; maternally
C) maternally; paternally
D) randomly; paternally
E) maternally; randomly
Answer: C
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The molten globule model of protein folding suggests:
A. hydrogen bonding of secondary structures drives folding. B. translation of the polypeptide is complete before folding begins. C. each domain of a polypeptide folds independently. D. intermediates of increasing free energy are created. E. hydrophobic residues coalesce to form intermediate structures.
Histamine ____
a. causes blood vessels to contract b. causes capillaries to lose their permeability c. causes an outward flow of fluids from the capillaries d. reduces tissue swelling e. causes cells to release interferons
Which of the following is a test cross? (a “dash” means the allele's identity is unknown)
a. R-MM ? R-mm b. RRMM ? rrmm c. R-M- ? R-Md. rrMM ? RRmm e. R-M- ? rrmm
Which microbiologists contributed to the germ theory of disease?
A) Warren and Marshall B) Pasteur and Koch C) Watson and Crick D) Jacob and Monod