Which of these statements is true?
a. The structure of the plasma membrane can be seen via light microscopy.
b. Cholesterol molecules form hydrogen bonds with fatty acids in phospholipids.
c. Viruses may change their glycocalyx to avoid triggering an immune response.
d. Carbohydrates may span between the inner and outer membrane surfaces.
c. Viruses may change their glycocalyx to avoid triggering an immune response.
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F+ X F- mating does not result in
a. plasmid genetic recombination. b. chromosomal genetic recombination. c. circularization of DNA. d. conjugation. e. cell-cell contact via a sex pilus.
A pine tree is called a sporophyte because it
a. develops from a germinated spore. b. produces spores by meiosis. c. is haploid. d. undergoes fertilization. e. reproduces by both sexual and asexual means.
A mutation that would change an amino acid coding codon into a termination codon is called a
_____________ mutation. Fill in the blank(s) with the appropriate word(s).
Prion (PrPc) is a (A)___________ protein that has a cytoprotective role. PrPsc has an ability to convert PrPc into PrPsc, and forms aggregation through stacking of its (B)____________.
a. (A) GPI anchored membrane, (B) B-sheet b. (A) seven-transmembrane, (B) B-sheet c. (A) GPI anchored membrane, (B) a-helix d. (A) seven-transmembrane, (B) A-helix