What best characterizes Crohn's diesease?
A) an ulcerated digestive tract
B) inflamed blood vessels
C) hard, accumulating feces
D) a cramping muscularis muscle
E) accumlating food in mucosa
Ans: A) an ulcerated digestive tract
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If you placed a red blood cell in a hypotonic solution, you would predict that its volume would ____ while the solute concentration in its cytoplasm would _____.
A. increase, increase B. increase, decrease C. decrease, increase D. decrease, decrease E. decrease, not change
A plasmid is a
a. small segment of DNA that is often isolated from virus chromosomes for cloning purposes. b. large linear segment of DNA that is often isolated from bacterial chromosomes for cloning purposes. c. small circular segment of DNA in bacteria that is linked by hydrogen bonds to the main bacterial chromosome. d. large circular segment of DNA in bacteria that is completely separated with the chromosome. e. small circular segment of DNA in bacteria that is completely separated from the chromosome.
Which of the following would be an accurate comparison of mitosis and meiosis?
1.Mitosis takes place in animals; meiosis takes place in plants. 2.Mitosis gives rise to cells that are genetically identical; meiosis gives rise to cells that have half the amount of genetic information as the original cell. 3.Mitosis takes place for producing eggs and sperm; meiosis takes place for growth and repair of damaged tissue. 4.Abnormal cell growth would be due to errors in meiosis.
How many natural elements exist on Earth?
a. 100 b. 112 c. 88 d. 96 e. 110