The power stroke describes:
A. the pivoting of the myosin head, which
causes actin and myosin to slide relative to
each other.
B. the binding of the myosin head to actin.
C. the cocking of the myosin head by
hydrolysis of ATP.
D. the cycle of events involved in muscle
contraction.
E. All of the answer options are correct.
A
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Bacteria that live attached to surfaces are described as ________, whereas bacteria that are free-living, floating with a fluid environment are described as ________.
Fill in the blank(s) with the appropriate word(s).
Why is speciation by polyploidy more likely in plants than in animals?
A) Plant gametes can be produced by meiosis from somatic cells that have undergone many rounds of mitosis. B) Plant gametes lack postzygotic isolating mechanisms. C) Plants are sessile and, therefore, are never prezygotically isolated to ensure reproduction. D) Plants are sessile and cannot speciate via dispersal. E) Plants lack the DNA repair enzymes that animals have.
Regions of a specimen with higher electron density scatter ________ electrons and, therefore, appear ________ in the image projected onto the screen of a transmission electron microscope.
A. fewer; lighter B. more; lighter C. fewer; darker D. more; darker
Which of the following statements about the two paired nucleotide strands of the DNA double helix are correct?
A: The nucleotides that make up one strand of the molecule are joined by hydrogen bonds. B: A-T basepairs have the same width as G-C basepairs. C: The G on one strand forms 3 hydrogen bonds with the C on the complementary strand. D: It is thermodynamically easier to break the bonds between A-T base pairs than between the G-C base pairs. E: A, B and C. F: B, C and D G: C and D