Members of the ___ Echinoderm lineage include sessile sea lilies and feather stars, which can swim or crawl as adults
a. Echinoidea
b. Ophiuroidea
c. Crinoidea
d. Holothuroidea
e. Asteroidea
ANSWER: c
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Which of the following is an advantage of the
three-chambered heart over the two-chambered heart?
a. blood flow is faster when there are two circuits instead of one circuit b. blood pressure is independently controlled in each vascular circuit c. oxygen-rich and oxygen-poor blood do not mix d. capillary beds are possible with a threechambered heart but not a two-chambered heart e. more than one of these is an advantage of the three-chambered heart over the twochambered heart
Steroid hormones are derived from
a. free fatty acids. b. cortisol. c. tyrosine. d. cholesterol. e. alanine.
Which autosomal dominant condition can be controlled by dietary means?
a. cystic fibrosis b. PKU c. Tay-Sachs disease d. Marfan syndrome e. achondroplasia
Which type of plant hormone generally acts as a growth inhibitor?
A) auxins B) gibberellins C) cytokinins D) abscisic acid (ABA)