Two species of spiny anteaters (echidnas) and the duck-billed platypus are the only known living members of the ____ mammalian lineage.
a. Strepsirhini
b. monotremes
c. Rodentia
d. Haplorhini
e. marsupials
ANSWER: b
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Low sperm count may result in an insufficient amount of enzyme to clear a path through the ____to the egg plasma membrane.
Fill in the blank(s) with the appropriate word(s).
The overwhelming majority of animals are:
A) vertebrates. B) invertebrates. C) mammals. D) sessile. E) unicellular.
Cilia and flagella (select all correct choices):
A. are specialized cells that move by rotary motion. B. are specialized organelles that move by rotary motion. C. are specialized organelles that propel some plant, algae, and animal cells. D. contain microfilaments arranged in nine pairs around the periphery and two microfilaments in the center. E. contain microtubules arranged in nine pairs around the periphery and two microfilaments in the center.
The natural loss of dead cells from the surface of your skin is a result of:
A. loss of adherens junctions between epithelial cells. B. breakdown of desomsomes. C. loss of microvilli. D. Answers a and b are both correct.