A friend tells you that her husband has been feeling
anxious for the past month. He has also felt fatigued
most of the time, and his face is puffy. Doctors have
already checked for ulcers, cancer, blood pressure
changes, and other blood irregularities, but have
found everything to be normal. You are an
endocrinologist, so you suggest that he be tested for
the most likely endocrine malfunction, which would
be __________ levels.
a. androgen/estrogen
b. glucocorticoid
c. calcitonin
d. melatonin
e. parathyroid
Answer: b
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Which one of the following is maintained during a chemical reaction?
A. the number of atoms present in the reactants B. the identity of the atoms present in the reactants C. the arrangement of chemical bonds present in the reactants D. the number and identity of the atoms present in the reactants E. the number and identity of the atoms, and the arrangement of chemical bonds present in the reactants.
What percentage of human DNA is devoted to coding exons?
a. 1% b. 1.5% c. 25% d. 50% e. 100%
In 1997, a gene called Le was discovered by two research groups led by David Martin and Diane Lester. Allelic variation in the Le gene, which controls elongation of the plant stem between branches, is responsible for which trait in peas?
A) inflated and constricted pod shape B) yellow and green pod color C) purple and white flowers D) tall and short plant height E) axial and terminal flower position
Glucose is converted into glucose 6-phosphate by hexokinase. Glucose 6-phosphate then serves as the substrate for the enzyme phosphoglucose isomerase, which converts this reactant into fructose 6-phosphate. Fructose 6-phosphate serves as the substrate for phosphofructokinase, which converts fructose 6-phosphate into fructose 1,6-bisphosphate. Based on the information provided, this is an example of
A. enzyme inhibition. B. a metabolic pathway. C. allosteric regulation. D. feedback inhibition.