The property of a test to detect only a certain antibody or antigen, and not to react with any others, is
A) Specificity
B) Sensitivity
C) Precipitation
D) Cross-reactions
E) Agglutination
A) Specificity
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A researcher in a lab finds a microscopic organism that has no nucleus, but has distinctive structural
molecules and mechanisms of photosynthesis. The organisms are abundant in virtually every habitat on Earth. The researcher has identified an organism belonging to the domain ____.
a. Bacteria b. “Protist” c. Eukarya d. Animalia e. Amoeba
When you are upright, what is the primary mechanism that propels blood in your feet back to your inferior vena cava?
A. recoil of elastic fibers in the walls of the leg veins B. contraction of the left ventricle of the heart C. contraction of smooth muscle in the walls of the leg veins D. contraction of skeletal muscles in your legs E. the valves in the leg veins alternating between open and closed
Which one of the following is NOT directly involved in the production of a typical spinal reflex?
A) brain B) sensory neuron C) motor neuron D) interneuron E) stimulus
Which process occurs during photosynthesis?
A) The light reactions produce NADP from sunlight energy. B) Carbon dioxide reacts with 5-carbon molecules during the Calvin cycle. C) ATP is released at the end of the Calvin cycle. D) Water captures the electrons released from excited chlorophyll pigments.