Isotopes are commonly used in medicine to determine if organs or organ systems are functioning properly. Physicians use radioactive iodine rather than elemental iodine to determine if the thyroid gland is functioning properly because:
1.Isotopes of iodine are radioactive, so they can be detected by imagery, and they act the same as elemental iodine.
2.Elemental iodine cannot be used by the human thyroid gland.
3.The isotope is more efficient than elemental iodine and would be processed by the thyroid gland at a higher rate.
4.Elemental iodine is in short supply.
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Answer the following statements true (T) or false (F)
1. Genes that are expressed only when needed are called constitutive genes. 2. Polysaccharides, polypeptides, and nucleic acids are all examples of polymers. 3. During translation, amino acids are “activated” by attaching to an appropriate rRNA molecule. 4. The peptide bonds that hold amino acids together in protein molecules are examples of covalent bonds. 5. In double-stranded DNA molecules, the two strands are held together by hydrogen bonds.
A layer of membrane outside the protein coat of some viruses is called a(n)
A. capsomere. B. capsid. C. protein coat. D. envelope. E. plasmid.
With absolutely no exception, all organisms use the same genetic code for the production of proteins
Indicate whether the statement is true or false
Which is correct regarding the rate of microbial death?
A. Cells become metabolically inactive but are never killed. B. Cells die at increasingly greater rates. C. Upon contact with the control agent, all cells die at one time. D. Cells in a culture die at a constant rate. E. Only older cells die in a culture.