What is a ribozyme? a. an enzyme that uses rna as a substrate b. an rna with enzymatic activity c. an enzyme that catalyzes the association between the large and small ribosomal subunits d. an enzyme that synthesizes rna as part of the transcription process e. an enzyme that synthesizes rna primers during dna replication?

Match each description to the appropriate biome. tropical savanna desert tropical rain forest taiga tundra has sparse vegetation and very cold temperatures located near the equator and contains trees that form dense canopy layers is very hot and dry, and has plants that need little water has cold winters, heavy snowfall and is dominated by conifers has warm temperatures and is dominated by grasses

What causes darkening of the skin as melanin production increases

Read each description below and determine to which stage of sleep each pertains. then click and drag each box into the appropriate category below.