What is the force that drives continental drift?
a. Subduction zones
b. Seafloor spreading
c. Fraction zones
d. Magma convection
b
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Which one of the following statements about horizontal gene transfer is false?
A. Horizontal gene transfer is also called lateral gene transfer. B. Horizontal gene transfer involves hitchhiking genes from other species. C. Horizontal gene transfer was common early in life, but is absent today. D. Gene swapping is evident in the human genome. E. The products of horizontal gene transfer often exist as transposons.
Oral infections with herpes simplex virus 1 can lie dormant in nerve cells for years, and when a patient becomes stressed, the virus is released, forming cold sores on the lips. Where will the virus be while dormant in the nerve cell?
a. Floating in the nerve cell cytoplasm b. Integrated in the nerve cell chromosomes c. In the nerve cell membrane d. Floating outside of the nerve cell, waiting to reinfect it e. In the blood
In plant roots, the Casparian strip is correctly described by which of the following?
a) It ensures that all minerals are absorbed from the soil in equal amounts. b) It provides energy for the active transport of minerals into the stele from the cortex. c) It provides increased surface area for the absorption of mineral nutrients. d) It ensures that all water and dissolved substances must pass through a cell membrane before entering the stele. e) It is located in the walls between endodermal cells and cortex cells.
You are the owner of Jurassic Park, and you want to set about populating your park with extinct animals. The first animal you want to have in your park is a wooly mammoth, and you have a remarkably well-preserved specimen that was frozen in the Arctic
ice 20,000 years ago. Design a method for populating your park with many living wooly mammoths. What will be an ideal response?