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

Biology & Microbiology

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Indicate whether the statement is true or false.

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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.

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_______ 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

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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

Biology & Microbiology