I am bored .need someone to talk . I prefer girls being friend

Which way do the nitrogenous bases in dna pair up? a. a and g; t and c b. a and c; t and g c. a and t; g and c d. a and a; t and t; g and g; c and c

Which of the following describes the difference in stimuli required to detect a difference between the stimuli? a. just noticeableb. signal detectionc. subliminald. top down

14. which of the following codons code for threonine? a. ucg b. ugu c. cga d. aca