Vesicles are important membrane-bound organelles that serve many roles in the cell. Which sequence represents a correct pathway that vesicles would follow in helping to deliver a protein for export from the cell? A. chloroplast → Golgi apparatus → mitochondrion
B. ribosome → Golgi apparatus → cell membrane
C. rough ER → smooth ER → cell wall
D. smooth ER → mitochondrion → vacuole

Why is excretion necessary to maintain homeostasis?

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.

An ecologist studied the same species of deer during the summer and the winter. she noticed that during the summer, when there was plenty of food, the deer were energetic and playful. however, during winter when food was scarce, the deer moved more slowly and did not run unless they needed to escape a predator. which scientific fact is best supported by her observations?