Explain why a person will develop a simple goiter if he or she has an insufficient amount of salt in the diet.
What will be an ideal response?
Most salt used today contains iodine. Iodine is needed by the thyroid gland in order to produce T3 and T4. If iodine levels are too low, the individual cannot produce the necessary amount of T3 and T4. This will result in constant stimulation of the thyroid by TSH, which is released by the anterior pituitary gland. Constant stimulation of the thyroid causes it to enlarge resulting in a simple goiter.
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Which of the following is a good example of two genes that are orthologous?
A) the promoter and the repressor genes of the lac operon in E. coli B) the genes for the first two enzymes in the glycolytic pathway C) the gene for the photosynthetic enzyme RuBisCO in a fern and in an oak D) the human gene for the cell surface protein Siglec-12, and the human pseudogene Siglec-13 E) None of these pairs are orthologous.
How did you figure out which prey would provide the optimal amount of energy for each lion?
What will be an ideal response?
A cell that contains a nucleus is called a(n) (prokaryotic/archaeal/eukaryotic) cell
What will be an ideal response?
Which cell type ranges in size from about 10-100 µm, has 80s ribosomes, and has internal compartments bounded by membranes?
A. Bacteria B. Archaea C. Eukarya