Which of the following are bones of the middle
ear?
a. hammer, anvil, stirrup
b. cochlea, pinna, anvil
c. anvil, pinna, stirrup
d. pinna, cochlea, hammer
e. anvil, hammer, cochlea
A
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Which of the following was observed by Erwin Chargaff?
A. Base composition of DNA does not vary from one species to another. B. The DNA isolated from different tissues of the same species all have the same base composition. C. Base composition changes as the organism ages. D. In all species, the number of adenines equals the number of guanines. E. In all species, A + T = G + C.
Which of the following group is most closely related to mammals?
A. Reptiles B. Amphibians C. Lancelets D. Cartilaginous fishes
Respond to the following statements with reference to the five plant micronutrients listed below.
A. This nutrient is a component of chlorophyll and many enzymes. B. This nutrient plays an important role in cell wall formation. C. This nutrient is a cofactor in photosystem II and also functions in signaling. D. This nutrient is a component of many proteins, and serves as cofactor for many enzymes. E. This nutrient is involved as cofactor in electron transfer chains.
An axenic environment is one
A) in which microorganisms remain with the person throughout life. B) that is free of microbes. C) that is a source of contamination. D) in which microorganisms remain present only for a short time. E) contaminated by microbial toxins.