This disease most commonly occurs because
an enzyme that crosslinks fibrin strands into a
stable mesh is defective. This disease is
a. sickle-cell anemia.
b. hemophilia.
c. atherosclerosis.
d. hypertension.
e. emphysema
B
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Upon close inspection of movement in annelids and nematodes, you would notice an obvious difference. Nematodes tend to wriggle back and forth, while annelids tend to contract along their length as their girth swells and then thin out as they stretch
What anatomical feature explains this type of movement? A) The annelids possess longitudinal muscle fibers that the nematodes lack. B) The nematodes lack circular muscle fibers. C) Nematodes lack a coelom. D) Annelids have a highly specialized nervous system capable of more complex movements.
A tiny loop of double-stranded DNA describes a
a. bacterium. b. DNA ligase. c. plasmid. d. antibiotic.
Which feature(s) DID NOT contribute to the ability of humans to maintain an upright body position?
a. curvature of the spine b. size and position of the pelvis c. position of the foramen magnum d. alignment of the toes e. smaller canines
The key point in Darwin's proposal is that the ________ imposes the conditions that determine the direction of selection.
A. gene B. parent C. environment D. individual