Of the chemicals that fall under the toxic substances control act, % have been thoroughly tested for toxicity and have been tested for endocrine, nervous, or immune system damage.

Which of these is not an example of molecular homology? 1. use of dna and rna as genetic material 2.use of glycolysis as the first step in cellular respiration in both plants and animals 3. the lack of an igf-1 gene in prokaryotes 4. the use of aldolase b to break down fructose in bacteria, plants and animals

Thyroid-stimulating hormone stimulates the thyroid gland to secrete sex hormones. true or false

Which one of the following is true of trnas? a) trnas are double-stranded. b) each trna binds a particular amino acid. c) there are four types of trna. d) trnas carry special sequences known as codons. e) all of the above