Which of the following is NOT a source for stem cells?
a) sperm and eggs
b) early embryos
c) certain adult tissues
d) umbilical cord blood
Ans: a) sperm and eggs
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A digestive cavity in which food enters an opening at one end and passes through the animal in one direction as it is digested is called the
A. gastrovascular cavity. B. stomach. C. alimentary canal. D. epithelial cavity. E. intestine.
Which of the following determines whether or not a wine is considered to be dry?
A. The percentage of alcohol after fermentation B. The amount of free sugar after fermentation C. The type of grape used as a starting material D. The amount of carbon dioxide after fermentation
Which of the following is NOT characteristic
of parasites?
a. They are specialists and usually are able to affect only one variety of hosts. b. They inflict serious injury and kill their hosts. c. Some reside inside their hosts, whereas others live outside their hosts. d. Their host may be a plant as well as an animal. e. They are dependent on hosts.
Which of the following are components of Chargaff's rules of bases?
A) % purines = % pyrimidines B) %C + %T = %A + %G C) %A = %T D) %G = %C E) All of these are true.