Consider the observations that a label on one head of a myosin V dimer moves in steps of 72 nm, but a label much nearer the myosin tail moves in steps of 36 nm
Discuss how these observations support a hand-over-hand mechanism rather than an inchworm mechanism of myosin V motility on an actin filament.
What will be an ideal response?
Answer: In the inchworm model, each myosin head would move in steps of 36 nm, as the trailing head moves 36 nm up to the position just behind the leading head and the leading head then steps forward 36 nm. In the hand-over-hand model, the trailing head steps a total of 76 nm as it pivots past the leading head to become the new leading head, whereas the tail region moves only 36 nm forward (see Fig. 14A-2).
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A. all the bacteria present in that sample. B. a very small number of bacteria present in that sample. C. all the metabolically active bacteria. D. all the metabolically inactive bacteria.
Gametes produced by inversion heterozygotes can produce no viable recombinant chromosomes due to what phenomenon?
What will be an ideal response?
A solution is a mixture of
a. polar and nonpolar substances. b. protons and neutrons. c. unevenly distributed substances. d. evenly distributed substances.
A cross between two individuals with different phenotypes that resulted in approximately 50% of each type of offspring would indicate the cross was ________
A) true dominant to a heterozygous dominant B) a homozygous recessive crossed to a heterozygous recessive C) a heterozygous dominant crossed to a homozygous recessive D) true breeding dominant to recessive E) a heterozygous dominant crossed to a heterozygous recessive