Antigen-presenting cells are ________________, and they display antigens to both ________________ and ______________.

Defensin and lysozyme are both part of ________ immunity and function as ___________.

In the classical pathway of complement activation,

Complete each sentence with the appropriate form of the verb IR to show an immediate future action. Josué y sus amigos guatemaltecos ______ a jugar al fútbol en el estadio o en el parque en Antigua.

When light strikes rhodopsin, the retinal is converted

Olfactory glomeruli are located in the

Hace mucho viento en Chicago, Illinois.

MHC class II molecules are loaded with exogenous antigen after the antigen has been digested into fragments within a phagolysosome. 

The retina is composed of two layers: an inner pigmented layer and an outer neural layer.

Choose the correct form of these irregular present tense verbs. Felipe casi nunca dice la verdad, pero yo siempre ________________ la verdad.