What molecules are released by activated helper T cells?
A. antigens
B. immunoglobulins
C. cytokines
D. antibodies
C. cytokines
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Birds and mammals share which of the
following characteristics?
a. ectothermy b. air pocketed bones c. bladders d. four-chambered heart e. more than one of these
Cephalization is
a. the division of the trunk into a scolex, neck, and body. b. the presence of a head with sense organs. c. sexual reproduction involving self-fertilization. d. the ability to replace lost body parts.
Within the vestibular system of vertebrates, hair cells help detect movement when their cilia are bent by
A. the tectorial membrane. B. gravity. C. the basilar membrane. D. otoliths. E. statoliths.
Which of the following statements about nutrition and digestion is true?
a. Feeding and digestion are synonyms. b. Chemical digestion typically precedes mechanical digestion in carnivores. c. During absorption, small molecules such as amino acids and simple sugars enter cells. d. Elimination rids the body of excessive nutrients e. Small sugars are joined by enzymatic hydrolysis to form large carbohydrates.