In the lock-and-key model of enzyme action, the fits into the of the enzyme. a. product; substrate. b. active site; product. c. substrate; active site. d. active site; substrate.

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion

Environmental science are unconsidered with methods to preserve natural resourcesa.trueb.false

16. which of the following accurately describes a step within transcription? a. dna polymerase uses one strand of rna as a template to put together nucleotides. b. the dna strand is used as a template for which a complementary rna strand can be produced. c. the rna strand forms a template by which dna can be built. d. the rna strand is produced within the cytoplasm.