The spiracle in conjunction with a ventral gill in skates and rays is an adaptation that allows them to:
a. be nekton.
b. have a bottom existence.
c. position their mouth ventrally.
d. avoid detection by predators.
e. filter feed on plankton.
B
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During the contraction of a vertebrate skeletal muscle fiber, calcium ions _____
A) break cross-bridges by acting as a cofactor in the hydrolysis of ATP B) bind with troponin, changing its shape so that the myosin-binding sites on actin are exposed C) transmit action potentials from the motor neuron to the muscle fiber D) spread action potentials through the T tubules E) re-establish the polarization of the plasma membrane following an action potential
The mature sporophyte body form of a typical ____ has fronds growing from a rhizome, with sori on the lower surface
or margins of some of the fronds.
a. moss b. whisk fern c. fern d. club moss e. horsetail
____________________ is the branch of genetics that is used to map genes and study chromosome structure and
abnormalities in chromosome number and organization. Fill in the blank(s) with the appropriate word(s).
The surgeon who advocated using disinfectants on hands and in the air prior to surgery was
A. Louis Pasteur. B. Joseph Lister. C. Antonie van Leeuwenhoek. D. Robert Koch. E. Ignaz Semmelweis.