Amphibians have
a. a two-chambered heart.
b. a three-chambered heart.
c. a four-chambered heart.
d. none of the above.
b
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Which of the following statements best describes the structure of a hemoglobin molecule?
A. Hemoglobin is comprised of three globin molecules and one heme group per hemoglobin molecule. B. Hemoglobin is comprised of four globin molecules, each with their own heme group that binds to and carries oxygen. C. Hemoglobin is comprised of four globin molecules, each of which contain millions of heme groups. D. Hemoglobin is comprised of two globin molecules, both with their own heme group that binds to and carries oxygen.
Which lineage includes living members that are sharks, skates, and rays?
a. Sarcopterygii b. Actinopterygii c. Petromyzontoidea d. Chondrichthyes
Plasmodium spp.
A. Belongs to the phylum Apicomplexa; intracellular; located in the blood; sexual and asexual reproduction; indirect life cycle B. Belongs to the phylum Euglenozoa; extracellular; located in the small intestine; asexual reproduction; direct life cycle C. Belongs to the phylum Euglenozoa; intracellular; located in different body tissues; asexual reproduction; indirect life cycle D. Belongs to the phylum Apicomplexa; intracellular; located in the small intestine; sexual and asexual reproduction; direct life cycle
Which of the following is an ongoing trend in the evolution of land plants?
A) decrease in the size of the leaf B) reduction of the gametophyte phase of the life cycle C) elimination of sperm cells or sperm nuclei D) increasing reliance on water to bring sperm and egg together E) replacement of roots by rhizoids