Which is not an innate protection of the female reproductive tract?
A) Normal microbiome members generate products which prevent pathogen growth.
B) Mucous secretions trap microbes.
C) The vaginal lining sheds its cells every few hours.
D) Lysozyme and antimicrobial peptides are present in vaginal secretions.
E) The vaginal lining contains ciliate cells which trap and expel bacteria from the tract.
Answer: E
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PCR is particularly useful in
A. detecting viable yet non-culturable organisms. B. assessing impure (multiple types of bacteria present) samples. C. dealing with very small numbers of bacteria. D. relatively quickly producing results. E. All of the choices are correct.
Respiration includes breathing in, called ________, and breathing out, called __________.
Fill in the blank(s) with the appropriate word(s)
Which pair of structures, found in different organisms, both serve to increase the absorptive surfaces of the intestines?
a. choanocytes and gastric ceca b. proventriculus and villi c. choanocytes and proventriculus d. typhlosoles and villi
Which theory was helpful to Darwin in the formulation of his theory of evolution?
A. Catastrophism B. Inheritance of acquired characteristics C. Uniformitarianism D. Continental drift E. Special creationism