Photosynthesis in the ocean takes place mostly in the mesopelagic zone
Indicate whether the statement is true or false
FALSE
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When a gene is transcribed, what is produced?
a. more DNA b. protein or polypeptide sequences c. messenger RNA d. enzymes e. genetic defects
Leeches belong to the phylum
a. Arthropoda. b. Mollusca. c. Annelida. d. Cnidaria.
Which animal has a closed circulatory system?
a. clam b. dog c. spider d. snail e. insect
Calcium moves into bones as new bone cells are formed, and moves out of bones as special cells break the bones down. Hormones that are produced by the thyroid and parathyroid glands help regulate this process. As bone cancer causes bones to break down, what might be observed in a patient's body chemistry?
A. Calcium would be released into the blood stream, causing high calcium levels. B. Calcium levels would always remain constant, as the thyroid and parathyroid glands would compensate. C. Calcium would be absorbed into the bones, causing low blood calcium levels.