Suppose you are going to draw models of the four main biomolecules. which statement describes how the models will be similar? a. they will be formed around carbon chains and rings b. they will all include a chain of amino acids c. they will all have hydrocarbon chains connected only by double bonds d. they will all include a sugar a phosphate group and a base

Ascientist separates a population of mice into two groups. what would most likely increase the rate of speciation in this population. a. teach the two groups different tricks b. allow the two groups to breed with each other c. put the two groups in different environment d. have the two groups live in identical ecosystems

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 activity of the modern sample is 1.10 bq . how long does that measurement take?