Which of the following substances is mismatched with its role?
a. Most B vitamins - coenzymes
b. Vitamin A - incorporated into visual pigments
c. Iron - component of thyroid hormones
d. Vitamin D - aids in calcium absorption
e. Phosphorus - bone formation, nucleotide synthesis
Answer: c. Iron - component of thyroid hormones
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Activation of the IFN-? globin promoter is an example of a histone code. Of the steps listed, which would be the last step?
A. exposure of the TATA box in promoter B. acetylation of nucleosomes C. transport of the nucleosome D. methylation of nucleosomes E. phosphorylation of nucleosomes
Mutagenic chemicals that ____ and are incorporated into DNA or RNA during synthesis are called base analogs
a. resemble nucleotides b. resemble genes c. resemble amino acids d. cause deletion mutations e. cause frameshift mutations
Human saliva contains ____ enzymes
a. aminopeptidase b. amylase c. chymotrypsin d. pepsin e. trypsin
Introns in pre-mRNA:a
code for specific protein domains. b. are spliced out of the message. c. move within the mRNA, giving rise to new exon combinations. d. protect pre-mRNA from enzyme degradation
e. code for important amino acid sequences