Which of the following types of contractions generate the greatest force?
A. lengthening contractions
B. shortening contractions
C. isometric contractions
D. contractions with rapid shortening
velocities
E. contractions with shortening velocities
equal to zero
A
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One theory of human evolution suggests that Homo erectus evolved directly into Homo sapiens (humans), after which point Homo erectus became extinct. If this is true, humans arose by ______
A. cladogenesis B. anagenesis C. allopatric speciation D. parapatric speciation
Spontaneous mutation occurs when
A) a DNA base is in an unstable tautomeric form as the replication fork arrives and a mismatched base is inserted. B) a person smokes cigarettes or is exposed to a teratogen for many years. C) the sugars and phosphates in the DNA double helix exchange places. D) thymine temporarily becomes uracil.
A cell or cell component that changes in response to specific stimuli is a(n) ________
a. feedback mechanism b. effector c. receptor d. integrator
Separation of the sister chromatids is a characteristic of which stage of mitosis?
a) anaphase b) telophase c) metaphase d) prometaphase