Explain the techniques used in the cloning of "Dolly."
What will be an ideal response?
Mammary cells were removed from an udder of a sheep. An egg was obtained from another ewe and its nucleus was removed. The two cells were combined with an electrical shock. After six days the embryo was transplanted into a surrogate mother sheep. Five months later, Dolly was born.
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In humans and other mammals, inactivated X chromosomes:
A. exhibit no gene transcription. B. exhibit a low level of transcription of a few genes. C. exhibit a low level of transcription of many genes. D. exhibit a normal level of transcription of a few genes. E. exhibit a normal level of transcription of many genes.
Animals that swim about freely are
A. plankton. B. benthic. C. nekton. D. zooplankton.
Why are children often told that if they eat too much candy their teeth will fall out?
A. Sugar attacks tooth enamel. B. Bacteria use the sugar to make ATP. This fermentation process produces acids as a by-product. C. Sugars gradually replace the tooth enamel. D. Bacteria secrete acids in order to digest the sugar molecules.
What is the smallest distance two points can be separated and still resolved using light microscopy?
(a) 20 nm (b) 0.2 ?m (c) 2 ?m (d) 200 ?m