Which of the following structures directly controls the pituitary?
What will be an ideal response?
hypothalamus
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The hemoglobin molecule ____
a. transports oxygen from the lungs to the cells of the body b. prevents sickle cell anemia when present in high enough concentrations in the blood c. is involved in amino acid metabolism d. acts as a cell surface receptor e. is controlled by a single gene
In mammals and some reptiles, the coelom is divided into smaller cavities that enclose the lungs, heart, and gut. What are these cavities called?
A. pleural, pericardial, and peritoneal cavities B. thoracic, pleural, and pericardial cavities C. pleural, pericardial, and cardial cavities D. perithoracic, peritoneal, and pericardial cavities
The mode of natural selection in which extreme phenotypes are less fit than the optimal intermediate phenotype is
A. convergent selection. B. disruptive selection. C. artificial selection. D. directive selection. E. stabilizing selection.
In a double-blind experiment, ________
A) the participants are unaware of whether they are in the experimental or control groups because of the use of placebos B) the researchers are unaware of which participants are in the experimental and control groups C) participants are randomly assigned to a control or experimental group D) All of the above are true.