The image below shows the difference between a calcium atom and a calcium ion. Based on the ion structure, which of following elements would form a bond with calcium in a one to one ratio and why? (2b. / DOK 3) A.
One bromine ion would bond to one calcium ion because the balance of their charges would result in a full octet.

B.
One selenium ion would bond to one calcium ion because the balance of their charges would result in a full octet.

C.
One bromine ion would bond to one calcium ion because they are both located in period 4.

D.
One arsenic ion would bond to one calcium ion because they are both located in period 4.

Identify which gland in the endocrine system is involved in each dysfunction and explain the effect of hormonal imbalance that was observed. 1.dwarfism 2.gigantism 3.goiter

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.

Drag each tile to the correct box. arrange the phases of mitosis in the correct order. 1 (condensation of chromosomes) 2 (separation of chromosomes) 3 (formation of spindle fibers) 4 (alignment of chromosomes in the center of the cell) 5 (pinching of the cell membrane)