The major function of the protonephridia in the flatworm is to:
a. conserve water.
b. conserve salts.
c. eliminate waste materials such as ammonia and urea.
d. eliminate excess water.
e. regulate the pH of the gastrovascular cavity.
D
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What is true according to the adaptor hypothesis?
A. The anticodon and amino acid have no relationship. B. A given tRNA can carry any of the twenty amino acids. C. The position of an amino acid within a polypeptide is determined by the binding of mRNA with a tRNA carrying a specific amino acid D. An amino acid recognizes the codon in mRNA.
Progesterone is produced in the pituitary and acts directly on the uterus
Indicate whether the statement is true or false.
The anatomical structure identified with the
letter "D" in the figure above is the a. myocardium. b. pulmonary veins. c. inferior vena cava. d. right atrium. e. heart apex
The oversecretion of ________ by the thyroid gland can result in ________.
A. T3; hyperthyroidism B. parathyroid hormone; Graves disease C. T3; hypothyroidism D. calcitonin; hyperthyroidism E. T4; hypothyroidism