What are fimbriae, and what is their function?
A. They are long, thin appendages that allow bacteria to be motile (move).
B. They are a thick, gelatinous substance surrounding some bacterial cells that allow them to stick to surfaces and protect them from phagocytic white blood cells.
C. They are elongated, hollow appendages that allow for the transfer of DNA.
D. They are small, circular pieces of DNA that frequently contain genes for antibiotic resistance.
E. They are stiff fibers that allow bacteria to adhere to surfaces.
Answer: E
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Examine Figure 44.1 in your text. According to this phylogeny, bilaterians (animals with bilateral symmetry) are most closely related to:
A. cnidarians. B. sponges. C. the group containing sponges and cnidarians. D. the group containing choanoflagellates, sponges, and cnidarians. E. None of the answer options are correct.
Science is subdivided into specific areas of study termed disciplines. These divisions are artificial but are helpful to narrow the massive scope of scientific knowledge to a manageable amount. Given what you know about each, which scientific division is likely to present the best answer to a question about how fluid dynamics affect blood pressure in mammals?
A. Bioinformatics – use of technology to study and store biological data B. Biochemistry – study of chemical reactions needed for life function, usually at the cellular level. C. Biology – study of life D. Biophysics – study of biological processes through physics
The recent reassessment of animal classification is the result of
A. new data from Carl Linnaeus. B. comparisons of DNA and rRNA among different taxa. C. new, genetically engineered species. D. developing resistance to antibiotics. E. new morphological data.
What do the letters D-N-A stand for?
A) Dioxyribonucleic acid B) Dioxyribonuclear acid C) Deoxyribonucleic acid D) Deoxyrobonuclear acid