The difference between normal and sickle-cell
hemoglobin is based upon
a. the number of amino acids in the molecule.
b. the substitution of one amino acid for
another.
c. the number and orientation of the amino
acid chain attached to the heme portion of
the molecule.
d. the number of oxygen molecules that can
be carried.
e. the types of bone marrow that produce it.
B
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A new species of tubeworm is discovered on a coral reef. The worm has a specialized ring of tentacles that acts as a sieve to capture small shrimp and plankton from the surrounding water. This worm would best be described as:
A. a suspension filter feeder. B. a suction feeder. C. an active predator. D. an herbivore. E. The feeding type of this worm cannot be determined from the information given.
This animal has tentacles, beaklike mouth
parts, and a radula. This animal is ___.
a. a squid b. a nautilus c. a clam d. an earthworm e. more than one of these
Which of the following pathogens would our innate immunity help protect us against?
A. fungi B. bacteria C. viruses D. Innate immunity would defend us against all of these pathogens.
Which microbial test tube culture will be a representation of an obligate anaerobe?