What do we call a lymphocyte that has never encountered an antigen?
A. T cell
B. B cell
C. foreign lymphocyte
D. stem leukocyte
E. naïve lymphocyte
E. naïve lymphocyte
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What is the name for molecules that provoke a specific immune response?
A. antigens B. lymphocytes C. antibodies D. lysozymes
Which of the following is NOT a free-floating photosynthetic organism found in a lake?
A. phytoplankton B. green algae C. zooplankton D. cyanobacteria E. diatom
This muscular valve prevents gastric juices from flowing back out of the stomach and into the esophagus
What will be an ideal response?
In which situation can a mixture always be called a solution?
A. when one of its components is a gas B. when there is no solvent in the mixture C. when its components are made up of different types of particles D. when the mixture is homogeneous