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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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.
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