The region between two adjacent “Z lines” is known as a ____
a. muscle fiber
b. sarcomere
c. tendon
d. ligament
e. myofibril
ANSWER: b
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Which statements about acid precipitation are accurate? Check all that apply.
_____ Acid rain is intermediate between point-source and diffuse pollution. _____ Mercury is a pollutant that often accompanies acid precipitation. _____ Acid precipitation is a severe problem in areas with soils having high buffering capacity. _____ Acid precipitation can affect aquatic ecosystems. _____ Acid precipitation can affect forests, weakening the trees and making them more susceptible to disease.
In both lichens and mycorrhizae, what does the fungal partner provide to its photosynthetic partner?
A) carbohydrates B) fixed nitrogen C) antibiotics D) water and minerals E) protection from harmful ultraviolet light
An amino acid contains a structural "backbone" chain of
A. nitrogens. B. phosphorus atoms. C. carbons. D. carbon and phosphorus atoms. E. nitrogens and carbons.
An extra copy of chromosome 21, a condition called ________ syndrome, occurs in about 1 of every 700 births, although this rate varies tremendously with the age of the parents
Fill in the blank(s) with correct word