Which of the following substances is made of lipids?
A) DNA
B) cellulose
C) steroids
D) enzymes
Answer: C
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Members of the lineage ____ have a pair of shells that are hinged together. They close the shells
together by contraction of one or two adductor muscles.
a. Cephalopoda b. Polyplacophora c. Bivalvia d. Gastropoda e. Scaphopoda
Sieve tubes are different from vessel elements because they ____
a. do not have nuclei b. are not connected to each other c. are alive at maturity d. conduct minerals e. transport water
The first line of defense against foreign invaders is ____
a. adaptive immunity b. the immune system c. B and T cell activity d. physical and chemical barriers e. antibody production
Which of the following is characteristic of hypothyroidism?
a. Grave’s disease b. elevated heart rate c. thyroid stimulating antibodies d. intolerant to cold temperatures e. heavy sweating