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.
Answer: C) It lands in the mucociliary ladder and moves to the pharynx to be swallowed.
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When division of the zygote reaches the eight-cell stage and the planes of cleavage of the upper four cells line up with those of the bottom four cells so that two tiers of cells result, one directly above the other, the type of cleavage is called
A. direct cleavage. B. spiral cleavage. C. indirect cleavage. D. protostome cleavage. E. radial cleavage.
Transcription of the XIST gene results in ________
a. an active X chromosome b. carpel formation in Arabidopsis thaliana c. stamen formation in Arabidopsis thaliana d. a Barr body
The study of the worldwide distribution of plants and animals is called
a. paleontology. b. microevolution. c. comparative morphology. 637 d. biogeography. e. phylogeny.
Which of the following terms describes NO3- ? NO2- ? N2O ? N2?
A) ammonification B) denitrification C) nitrification D) nitrogen fixation E) anaerobic respiration