Which of these early terrestrial organisms is believed to have evolved vascular tissue?
A. gymnosperms
B. conifers
C. bryophytes
D. ferns
D. ferns
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Which of the following is the most common systemic fungal disease in the United States?
A) cryptococcosis B) coccidioidomycosis C) histoplasmosis D) Pneumocystis pneumonia
Mendel's law of segregation states that
A) members of a pair of alleles on homologous chromosomes move away from each other during gamete formation. B) genes end up in their respective gametes by chance. C) each gamete receives a full complement of chromosomes. D) genes in the same chromosome must stay together. E) there may be alternative forms of the same gene.
All of the following are functions of the lymphatic system EXCEPT
A) returning dissolved materials to the circulation. B) returning fluid to the circulatory system. C) transporting fats to the circulatory system. D) defending the body. E) transporting oxygen to the lungs.
How is the HIV provirus different from a lambda-phage prophage?
A. the HIV provirus is integrated permanently into the host cell's DNA. B. all subsequent generations of HIV-infected cells carry the provirus. C. all the offspring of a cell infected with a prophage will contain the virus. D. the HIV provirus is inactive inside the host cell. E. lambda phage-infected cells produce virus slowly over time.