A scolex is
a. the anterior attachment organ of a tapeworm.
b. the feeding organ of a fluke.
c. an appendage of a sandworm.
d. the egg of a sea star.
e. the larva of an aquatic insect.
Answer: a
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Bacterial and eukaryotic replication have many similarities. Which of the following is not a true comparison?
A. Both form loops with the lagging strand template to accommodate the antiparallel nature of DNA. B. Both incorporate a sliding clamp mechanism in their replication polymerase. C. Both the primase of bacteria and Pol ? of eukaryotes are responsible for primer synthesis and only incorporate ribonucleotides. D. Eukaryotic replication rates are slower than bacterial rates. E. The Okazaki fragments generated in eukaryotes are shorter than those in bacteria.
A hermaphrodite is described by all of the following, except which statement?
A. An animal that can produce both eggs and sperm B. An animal that develops from unfertilized eggs C. An animal that can self-fertilize D. An animal that switches from one sex to another over the course of its lifetime E. An animal that produces both eggs and sperm but may require a partner for reproduction
In a conjugation experiment not all of the cells receiving two genes will demonstrate an altered phenotype for both genes. What is the most likely explanation of this phenomenon?
A. One gene is toxic to the cell B. Transferred genes must undergo recombination for genotypic conversion of the recipient cell and there is a possibility that only one gene will be recombined into the recipients chromosome C. The transferred DNA is rapidly degraded by the recipient cell and one gene can be degraded before it is recombined into the host chromosome D. It is not physically possible to recombine more than one gene into a single host genome per conjugation event
What phyla of animals has the greatest number of species?
A. Arthropoda. B. Chordata. C. Mollusca. D. Annelida. E. Nematoda.