What is the correct sequence of structures through which air passes through on the way into the mammalian lung?
A. larynx ? pharynx ? trachea ? bronchi ? bronchioles ? alveoli
B. alveoli ? bronchioles ? bronchi ? trachea ? larynx ? pharynx
C. pharynx ? larynx ? trachea ? bronchi ? bronchioles ? alveoli
D. pharynx ? trachea ? larynx ? bronchi ? bronchioles ?alveoli
E. bronchi ? bronchioles ? pharynx ? larynx ? trachea ? alveoli
Answer: C
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By examining the phylogenetic tree diagrammed in the figure above, what conclusion can you draw about the species G. microti?
A) It evolved before G. intestinalis. B) It is more closely related to G. muris than to G. intestinalis. C) It should not be labeled a species distinct from G. intestinalis. D) It is part of a monophyletic group that also includes G. intestinalis.
As you recall, a single enzyme molecule may catalyze a reaction many times. In signal transduction
pathways, which may utilize several enzymes, the result is _________.
a. amplification of the final product b. denaturation of non-essential proteins c. hydrolysis of signal molecules d. transformational modification of the receptor e. change in cell membrane permeability
Heat will cause an enzyme to do which of the following?
a. Keep its shape b. Catalyze slower c. Denature d. Bind together with other enzymes
Which of the examples below are polymorphic traits? Select all that apply.
A. Lactose tolerance and intolerance in humans. B. A population of lilies that contains equal proportions of both blue and white flowering individuals. C. The A, B, and O blood types found in humans. D. Hair loss in malnourished, captive chimpanzees. E. The change from white coat in winter to brown coat in summer in Arctic fox populations.