Based on modern molecular phylogeny, which of the following animal taxons does NOT have any
members with segmentation as a derived condition?
a. Deuterostomia
b. Ecdysozoa
c. Lophotrochozoa
d. Protostomia
e. Radiata
E
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Steroid hormones, such as testosterone and estrogen, are polar signaling molecules
a. True b. False
Cholesterol
a. has a rigid backbone of four carbon rings. b. is the most common sterol in animal tissue. c. is a lipid without a fatty-acid component. d. is needed to produce sexual development and maturity. e. is all of these.
Which portion of the plant life cycle is haploid?
A. zygote B. sporophyte C. gametophyte D. Both sporophyte and gametophyte are haploid.
Which refers to an organic, nonpolypeptide compound that binds to the apoenzyme and serves as a cofactor?
a. mineral b. catalyst c. substrate d. coenzyme e. allosteric regulator