While examining a rock surface, you have discovered an interesting new organism. Which of the following criteria will allow you to classify the organism as belonging to Bacteria but not Archaea or Eukarya?
A) Cell walls are made primarily of peptidoglycan.
B) The organism does not have nucleus.
C) The lipids in its plasma membrane consist of glycerol bonded to straight-chain fatty acids.
D) It can survive at a temperature over 100°C.
A
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The MONOPTEROUS gene in Arabidopsis encodes a protein that is similar in its function to which animal protein?
A) MyoD in frog embryos B) Bicoid in fruit-fly embryos C) keratin in human embryos
One of the most common causes of mental retardation in the United States is
a. congenital rubella syndrome. b. cocaine addiction. c. fetal alcohol syndrome. d. use of thalidomide by pregnant women. e. use of tetracycline by pregnant women.
Only charged atoms can form ionic bonds.
Answer the following statement true (T) or false (F)
A researcher inserted DNA fragments from an organism into expression vector plasmids and introduced the modified plasmids into bacterial cells. Which of the following methods would be an effective means of identifying which clones contain a specific gene of interest?
A. Sequence the DNA of the plasmids from each isolate. B. Prepare and analyze restriction fragments of the plasmids. C. Isolate clones that still have the vector's genetic marker. D. Use a DNA probe to detect colonies with the inserted DNA. E. Use reverse transcriptase to prepare cDNA copies.