Members of the ____ flatworm lineage are vertebrate endoparasites;some, called blood flukes, cause an often deadly
disease in humans called schistosomiasis.
a. Trematoda
b. Turbellaria
c. Polychaeta
d. Cestoda
e. Hirudinea
ANSWER: a
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After a human being draws in outside air through the nasal cavity, in what order does the air flow before reaching the alveoli?
a. Larynx, trachea, bronchi, bronchioles b. Trachea, larynx, bronchi, bronchioles c. Larynx, trachea, bronchioles, bronchi d. Trachea, larynx, bronchioles, bronchi
In order for macromolecules to form, smaller molecules must be concentrated. All of the following have been proposed as ways for concentrating organic molecules EXCEPT?
A. Organic molecules could have collected on the surface of clay particles. B. Organic molecules could have been concentrated when they were trapped in small basins and the water evaporated. C. Organic molecules could have made copies of themselves and this resulted in concentrations of molecules. D. Organic molecules could have been concentrated when water froze.
In which direction does DNA polymerase synthesize the new DNA strand?
a. 5' to 3' b. 3' to 5' c. Both 5' to 3' and 3' to 5'
The difference in sizes between male and female gametes results from two unequal divisions of __________________ in female gamete development.
A) cytoplasm B) nuclei C) mitosis D) chromosomes E) DNA