Which of the following statements best describes the power stroke of muscle contraction?
A) The myosin head bends, pulling the thick filament toward the center of the sarcomere.
B) The myosin head bends, pulling the thin filament toward the center of the sarcomere.
C) The actin head bends, pulling the thin filament toward the center of the sarcomere.
D) The actin head bends, pulling the thick filament toward the center of the sarcomere.
Answer: B
You might also like to view...
Phylogenetic stains, such as those used in FISH, hybridize with
A) ribosomal RNA. B) mitochondrial DNA. C) nuclear DNA. D) RNA polymerase.
The rusts of grain crops are good examples of ________.
A. basidiomycetes B. zygomycetes C. ascomycetes D. Rusts fall in several different fungal groupings.
Which of the following is NOT true concerning
sensory neurons? a. They detect changing conditions inside or outside the body. b. They lie in the pathway between the interneurons and motor neurons. c. They respond to stimuli such as light or odor. d. They relay information to integrators. e. They are one of three types of neurons.
The common ancestor of sponges and other animals was probably
A) multicellular with tissues but without organ systems. B) multicellular with tissues and many organ systems. C) unicellular. D) multicellular without tissues. E) multicellular with tissues and a few organ systems.