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

Biology & Microbiology

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What is the name for molecules that provoke a specific immune response?  

A.  antigens B.  lymphocytes C.  antibodies D.  lysozymes

Biology & Microbiology

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

Biology & Microbiology

This muscular valve prevents gastric juices from flowing back out of the stomach and into the esophagus

What will be an ideal response?

Biology & Microbiology

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

Biology & Microbiology