The chorion and __________ become part of the

placenta, the organ that allows exchange of
substances between maternal and fetal
bloodstreams. Fill in the blank(s) with the appropriate word(s).


Answer: allantois

Biology & Microbiology

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IgM is the:

a. first antibody produced when an invading microorganism is initially encountered. b. antibody that is associated with various parasitic infections. c. antibody that is secreted in various body fluids and primarily protects those body surfaces lined with mucous membranes. d. second antibody produced when an in-vading microorganism is initially encoun-tered and the most abundant.

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The mode of transmission of B. pertussis can best be described as:

a. person-to-person contact. b. exposure to contaminated water. c. inhalation of contaminated air. d. close contact with animals.

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The Human Genome Project completed in 2003 focused on sequencing the genome(s) of _____

a. the mouse only b. humans only c. bacteria only d. humans and prokaryotes only e. humans and other model organisms

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Organisms that can grow with or without oxygen present are

A) obligate aerobes. B) facultative anaerobes. C) aerotolerant anaerobes. D) obligate anaerobes. E) either facultative anaerobes or aerotolerant anaerobes.

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