The basic unit of structure and function in the nervous system is the neuron. a. true b. false 17 The endocrine system produces chemical messengers called enzymes. a. true b. false 18 The thyroid is a link between the nervous and endocrine systems. a. true b. false 19 Axons connect sensory neurons to motor neurons. a. true b. false 20 The parathyroids regulate the level of calcium in the blood. a. true b. 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.