The cell is protected from the outside environment by the

cell membrane
cytoplasm
shell
vacuole

question 9 (multiple choice worth 2 points)

which organelle is responsible for controlling the cell's activities?

mitochondria
ribosome
nucleus
endoplasmic reticulum

question 10 (multiple choice worth 2 points)

the ribosomes are responsible for what?

digestion
storage
manufacturing proteins
transportation within the cell

What is the difference between bacterial infections and viral infections?

Aboy with an extra x chromosome probably has which of the following syndromes?

Which is an advantage of having memory cells when a pathogen is encountered for a second time. a) the memory cells are what proliferate into clones of cells in response to the binding of an antigen. b) memory cells are vital to the primary immune response in that they immediately recognize pathogens even at the first encounter. c) memory cells are essentially effector cells that are short lived and attack antigens even without having a receptor specific to that antigen. d) it ensures that more lymphocytes with a receptor specific to a particular antigen will be present than in a host that had never encountered that pathogen.