Ms. Timms explains to her class that stars look different in the sky depending on how close they are to Earth. She takes the class into the hallway. She gives a flashlight to Maurice and an identical flashlight to Jessica. Maurice shines his flashlight about one meter away, close to the class. Jessica walks far down the hallway and shines her flashlight about twenty meters from the class. What did the class notice about the two lights? A) The far light was wider. B) The closer light appeared (or looked) brighter C) The lights were the same size. D) The lights were different shapes.

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.

The green colored pigment in chloroplasts is? a. nitrogen b. chlorophyll c. chlorophorm d. chlorofloromethane

What is it called when part of a cell membrane closes around a molecule to allow the molecule to enter the cell? a. passive transport b.diffusion c. endocytosis d. exocytosisc. endocytosis