Help A double-stranded DNA molecule was found to have 13 % of all its bases being A (adenine) • Deduce the percentages of T, C, and G in this double strand of DNA, using the known percentage of A • Justify each calculation, by providing information from the previous page or from a textbook

Construct at least two possible hypotheses for the student’s experiment.

Imagine a self-reactive t cell that has not undergone clonal deletion in the thymus (that is to say, it has escaped central tolerance). if it encounters self antigen in the absence of an infection or inflammation, what will happen to this self-reactive t cell? (select two answers) (a) the t cell undergoes clonal expansion. (b) the t cell gains effector functions. (c) the t cell undergoes apoptosis. (d) the t cell becomes activated. (e) the t cell becomes anergic.

Introducing minvasive species to an ecosystem results in an increase in biodiversity is it true or false