What is (are) the role(s) of complement proteins in the immune response?
I. They attract white blood cells to the site of infection.
II. They help other cells avoid infection.
III. They cause pathogens to clump together, making the pathogens easier to identify and destroy.
IV. They form a pore in the plasma membrane of a pathogen, causing it to rupture.
I only
II and IV only
II and III only
I and IV only
I, II, and IV only

Which of the following structures is not found in both plant and animal cells? a) chloroplast b) cytoskeleton c) ribosomes d) mitochondria

Apatient has an open displaced fracture of the second cervical vertebra. this is her fifth visit and the fracture is healing normally. what icd-10-cm code is reported?

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 8 options: the cold balloon expands and rises. the warm balloon shrinks and sinks. the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the warm balloon expands and rises. the cold balloon shrinks and sinks.