A respiratory system is needed if an organism is too __________ to rely on the diffusion of gases
through the body's tissues.
a. small
b. long
c. thick
d. thin
e. round
C
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Which of the following is NOT found in an arteriole?
a. elastic layer b. basement membrane c. smooth muscle d. valve e. endothelium
What happens to a dust particle that is too large to stay airborne and land in the alveoli?
A) It lands in the respiratory bronchiole, where it is coughed out. B) It lands in the mucociliary ladder, where it is moved to the trachea to be exhaled. C) It lands in the mucociliary ladder and moves to the pharynx to be swallowed. D) It lands in the bronchi, where it is absorbed. E) It lands in the mucociliary ladder, where type II macrophages phagocytize them.
You read that the frequency of a particular disease-associated recessive allele in a population is 12%. What does that mean?
A) 12% of the population has the disease caused by that allele. B) 12% of the population is a carrier for that disease. C) For every 100 people, there are 12 copies of the allele. D) The allele is present in 12% of the cells in your body.
Animals of the phylum ____ are likely to have an exoskeleton.
A. Mollusca B. Arthropoda C. Nematoda D. Chordata E. Annelida