Which of the following is NOT a reason that an animal's gut is a favorable habitat for mutualistic microorganisms?
a. Constant temperature
b. Ready supply of nutrients
c. Inhospitable conditions for many micro-competitors
d. Easy access to bloodstream
Ans: d. Easy access to bloodstream
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A climograph portrays the particular combination of temperature and rainfall conditions where each
terrestrial biome occurs.
Indicate whether the statement is true or false.How do silk moths attract mates?
A) The females flit around the males in an elaborate dance. B) They build elaborate nests. C) The females secrete pheromones to attract males. D) The males sing a high-pitched song to attract the females. E) The males turn bright red as a visual signal.
_______ structures are those that have no obvious function at the present time but are believed to be "leftovers" from an ancestor that did use that part.
a) vestigal b) adaptive c) analogous d) homologous
Enzymes that cleave DNA at specific sites are called ________. Cutting by some of these enzymes results in single-stranded, complementary tails called ________.
A. endonucleases; sticky B. peptidases; lagging C. vectors; blunt D. DNases; leading