The fatty acid tails of a phospholipid are _____ because they _____.
A. hydrophobic ... dissolve easily in water
B. hydrophobic ... have no charges to which water molecules can adhere
C. hydrophilic ... consist of units assembled by dehydration reactions
D. hydrophilic ... are easily hydrolyzed into their monomers
E. hydrophobic ... consist of units assembled by dehydration reactions
Ans: B. hydrophobic ... have no charges to which water molecules can adhere
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The very first level of packaging eukaryotic DNA is the:
A. 30-nm chromatin fiber. B. nucleosome. C. beads on a string. D. both the 30-nm chromatin fiber and beads on a string. E. None of the answer options is correct.
Which of the following is nota feature of the DNA helix proposed by Watson and Crick?
A. double-stranded B. right-handed C. antiparallel D. complementary base pairing E. two grooves of equal dimensions
Cytogenetic is
A. A photographic representation of chromosome. B. The field of genetics that involves the microscopic examination of the chromosomes and cell division. C. The sorting process to divide one cell nucleus into two nuclei. D. The process in which the two nuclei are segregated into separate daughter cells' E. The process by which the haploid cells are produced from a cell that was originally diploid.
Which of the following statements about atherosclerosis is false? a. Both high-fat diets and genetics influence the development of the disease
b. A heart attack occurs when a cardiac artery is completely blocked. c. High HDL levels in blood increase risk of atherosclerosis. d. Buildup of lipids in the arterial wall narrows the lumen.