1. A participant in a cognitive psychology experiment is given 50 words to remember and later asked to recall as many words as she can. She recalls 17 words. What is the (a) variable, (b) possible values, and (c) score?

Why do rna viruses appear to have higher rates of mutation? a) rna nucleotides are more unstable than dna nucleotides. b) replication of their genomes does not involve proofreading. c) rna viruses can incorporate a variety of nonstandard bases. d) rna viruses are more sensitive to mutagens.