Differentiated cells in a developing embryo derive from
What will be an ideal response?
ectoderm, mesoderm, and endoderm
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What additional affects will a vagotomy (severing the vagus nerve) have on a patient, besides lowering stomach acid secretion?
a) A vagotomy will inhibit the secretion of somatostatin, which will decrease the acid in the stomach too much. b) Stomach acids are needed to activate pepsinogen so lower acid secretion will affect protein digestion in the stomach. c) If there is a decrease in acid, then there will be an increase in the production of chyme to enter the small intestine. d) Stomach acids are necessary to keep the mucous membrane proliferating. If there is a decrease in stomach acids, the epithelial lining will no longer go through mitosis.
The hand is made up of _____ regions.
Fill in the blank(s) with the appropriate word(s).
Which of the following formed elements do not have chromosomes?
A. erythrocytes B. reticulocytes C. erythroblasts D. erythrocytes and reticulocytes E. erythrocytes, reticulocytes and erythroblasts
Which term refers to the process of copying the information encoded in DNA into RNA?
a) transcription b) replication c) translation d) initiation