Deficiency of iodine in the diet results in _____________ caused by ________________
A. a goiter; increased production of thyroid-stimulating hormone (TSH) and increased thyroid hormone levels
B. atrophy of the thyroid gland; loss of negative feedback by thyroid hormones and increased thyroid-stimulating hormone (TSH) levels
C. a goiter; loss of negative feedback by thyroid hormones and increased thyroid-stimulating hormone (TSH) levels
D. atrophy of the thyroid gland; decreased sensitivity of receptors for thyroid-stimulating hormone (TSH)
E. atrophy of the anterior pituitary gland; loss of negative feedback by thyroid hormones
C
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In a fetus, blood from the right atrium can flow freely to the left atrium through the ________, thus bypassing the pulmonary circuit.
A) foramen ovale B) ductus arteriosus C) fossa ovalis D) ductus venosus E) ligamentum arteriosum
Which of the following is required for erythropoiesis?
A. Vitamin K B. Vitamin B12 C. Folate D. Iron E. All of the choices are correct.
The primary structure of a protein is
A. the number of polypeptide chains in the molecule. B. the hydrogen bonds between amino acids. C. the folded, helical nature of the molecule. D. represented by multiple polypeptide chains. E. the sequence of amino acids in the polypeptide chain.
All amino acids have both a carboxyl group and an amino group attached to a central carbon
Indicate whether the statement is true or false