In the life cycle of the pinworm Enterobius, a common pediatric infection, the child carries the adult worm in his/her intestine.  The adult worm releases eggs, which are transmitted out of the body in the feces.  The child will scratch the itching anal region, picking up the worm eggs and re-inserting them into his/her mouth.  For this helminth life cycle, the human is the ________ host.

A. primary
B. intermediate and definitive
C. definitive
D. intermediate


Answer: B

Biology & Microbiology

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Sexual reproduction has an advantage over asexual reproduction by ____

a. requiring an interaction between two individuals b. creating more genetic diversity c. ensuring a greater number of progeny d. keeping the number of chromosomes constant more effectively e. allowing for the production and use of gametes

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Why is the absence of bone in Chondrichthyes considered a derived trait?

What will be an ideal response?

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The use of ____________________ is banned or restricted in more than 23 countries due to its toxicity. Fill in the blank(s) with the appropriate word(s)

Biology & Microbiology

A(n) ________ inversion includes the centromere

A) concentric B) pericentric C) paracentric D) epicentric E) chromocentric

Biology & Microbiology