Genes that have DNA sequences similar to functional genes but that do not appear to produce any functional product are ________.
Fill in the blank(s) with the appropriate word(s).
pseudogenes
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Thick- skinned rhinoceroses and elephants were once classified together as pachyderms (meaning "thick skin"). They actually descended from different ancestors that in turn evolved from a thin-skinned common ancestor that was not included in the pachyderms. Pachyderms were therefore, as a taxon,
A. monophyletic. B. polyphyletic. C. paraphyletic. D. a supergroup. E. a kingdom.
Decreases in CO2 concentration result in ____
a. faster breathing b. deeper breathing c. faster and deeper breathing d. slower and more shallow breathing e. slower breathing
Arthropod success cannot be attributed to which adaptation?
a. modified segments b. jointed appendages c. closed circulatory system d. sensory specialization e. specialized developmental stages
Which of the following statements is true?
a. Although hormones are carried to all parts of the body, they produce effects only in cells with proper receptors. b. Hormones are limited to steroid compounds. c. Hormones are secreted by specialized exocrine glands. d. Most hormones are controlled by positive feedback mechanisms involving the pituitary gland. e. Target cell response to the secretion of a hormone is as rapid as an effector response in the nervous system.