How does the skeletal system of an arachnid differ from that of a cephalopod?
What will be an ideal response?
Arachnids have an exoskeleton composed of protein and chitin that surrounds the entire body. A cephalopod has a cartilage skeleton around its brains only.
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Which organism is often isolated in the sputum of patients with cystic fibrosis?
a. Acinetobacter spp. b. B. trematum c. Burkholderia gladioli d. S. maltophilia
The granules of neutrophils contain ________.
A. histamine B. antigens C. digestive enzymes D. peroxidase E. antibodies
Mendel observed that some genetic traits seemed to mask others in the pea plants, and used the term ___ to describe these traits.
a. dominant b. homologous c. heterozygous d. recessive e. homozygous
Action potentials in contractile cardiac muscle cells
A. are much faster than action potentials in skeletal muscle. B. have no plateau phase. C. involve voltage-gated calcium ion channels. D. have sodium ion channels that open and cause repolarization. E. have all of these characteristics.