When a 22s rule is violated, is it caused by systematic or random error? 

How are antigens most likely presented to naive helper T-cells?

With reference to the tree, which of the following is an accurate statement of relationships?

True or False (circle one). Bacteria and archaea have peptidoglycan in their cell walls, while eukaryotes do not have a cell wall.   Briefly justify your answer

Which of the following statements about T-cells is FALSE?

What is the last thing you should do before you leave lab

The patient below presented with an illness and complained of pain when swallowing. You performed a throat swab and sequenced the bacterium growing in the child’s throat.  1) Which drug would you administer?   2) explain why.

Human immune response to pathogens

What is the major function of flagella? Where would the flagella be located on a amphitrichous cell?

Which cellular structures could a bacterium use for attachment/to secure itself in a particular environment. (select all that apply)