Which lipid forms cell membranes?
a. unsaturated fats
b. steroids
c. waxes
d. phospholipids
e. saturated fats
d
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DNA replication can stall as a consequence of the replication machinery encountering hairpin DNA structures that can form due to inverted repeats and palindromic sequences
When DNA replication stalls, double-strand breaks in the DNA can occur, causing severe genetic and cellular consequences. Both Werner syndrome (premature onset of age-related phenotypes and cancer) and Bloom syndrome (cancer) are the result of mutations in helicase, an enzyme that unwinds hairpin structures. Helicase most likely breaks which type of bonds in a hairpin? A. glycosidic B. phosphodiester C. hydrogen D. peptide E. covalent
A dense, irregularly shaped region within the nucleus in which subunits of ribosomes are synthesized is called the:
a. plastid b. vacuole c. microvillus d. nucleolus e. basal body
Which cellular protein is found in tight junctions?
A) occludins B) tubulin C) connexons D) cadherins E) dynein
What characteristic is unlikely to be associated with arctic tundra?
A. A perpetually waterlogged soil B. Rapid nutrient recycling C. One of the world’s greatest store of carbon D. Permafrost E. Cool, anaerobic conditions