What is the name of the thick, membranous sac that surrounds and protects the heart?
A. epicardium
B. mesothelium
C. myocardium
D. endothelium
E. pericardium
Answer: E
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A cell that has a diploid number of 6 chromosomes has 3 chromosomes lined up in the center of the cell, each chromosome containing two joined sister chromatids. What phase of the cell cycle is this cell in?
A) Metaphase I of meiosis B) Metaphase II of meiosis C) Metaphase of mitosis D) Telophase I of meiosis
Ecological efficiency, the percentage of energy at one trophic level that ends up in tissue in the next level, is about:
a. 1 to 5 percent b. 1 to 20 percent c. 5 to 30 percent d. 10 to 40 percent e. 50 to 60 percent
Four of the five answers listed below are
conditions caused by chromosomal nondisjunction. Select the EXCEPTION.
a. Down syndrome b. Huntington's disease c. Turner syndrome d. Klinefelter's syndrome e. trisomy 18
Common signs of bleeding in the upper gastrointestinal tract include all of the following, EXCEPT:
A) melena. B) hematochezia. C) hematemesis. D) dark, tarry stools.