Fins composed of a web of skin covering thin, bony spines are characteristic of
A) hagfishes.
B) ray-finned fishes.
C) lampreys.
D) lobe-finned fishes.
E) cartilaginous fishes.
B
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Answer the following questions true (T) or false (F)
1. If an Rh-positive woman marries an Rh-negative man, their children are at risk for hemolytic disease of the newborn. 2. Infection with certain viruses may lead to the development of type I diabetes. 3. Depletion of the helper T cell population by HIV results in the development of AIDS.
The atomic number is determined by the number of ____.?
a. protons b. neutrons c. electrons d. protons plus neutrons e. protons plus electrons
Which type of molecular assay has been developed to identify P. jirovecii?
a. Nucleic acid sequence-based amplification (NASBA) b. Strand displacement amplification (SDA) c. Transcription-mediated amplification (TMA) d. Real-time polymerase chain reaction (PCR)
Damage to its flagellum would prevent a choanocyte from
A. circulating water through the sponge. B. stinging and capturing prey. C. secreting spongin to form the sponge body. D. producing the supportive spicules.