In the United States, purple loosestrife, Japanese and Amur honeysuckle, Australian Melaleuca, and Brazilian pepper are all:
A) native flowering plants nearly brought to extinction by consumption by exotic insects.
B) native flowering plants nearly brought to extinction by competition from exotic plants.
C) exotic flowering plants that have caused relatively few problems for native species.
D) exotic flowering plants that have caused significant problems for native species.
Ans: D) exotic flowering plants that have caused significant problems for native species.
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Steroid hormones bind to receptors inside the cell and alter their conformation. The hormone-receptor complex is then transported into the nucleus, where it can directly affect gene expression. To get from the location where the receptor binds the hormone to its site of action, the hormone-receptor complex must _____.
A) undergo another conformational change B) become water soluble by binding to a carrier molecule C) be transported through the nuclear pore complex D) enter the smooth endoplasmic reticulum
Most epidermal cells are ___
a. melanocytes b. keratinocytes c. collagenocytes d. phagocytes e. erythrocytes
Binding of a protein hormone may lead to formation
of a __________, which relays a signal into the cell. Fill in the blank(s) with the appropriate word(s).
Bacterial gene transfer is also used in the lab to introduce genes into organisms of different species, genera, phyla, or even kingdoms or domains
A major example is the use of a Ti plasmid of the soil bacterium Agrobacterium tumefaciens to transfer genes into dicotyledonous plants. The bacterium infects the plant root in the soil and transfers some of the Ti plasmid genes (T DNA) into the plant nucleus. Recombination may occur, and T DNA expression is controlled by plant compounds generated in response to wounding and infection. Assuming you have appropriately engineered the Ti plasmid to carry the gene in question, how could you best and most safely test whether your potatoes are now working as a vaccine? A) Feed the engineered potato to a population at high risk for cholera. B) Cook the potatoes to denature the toxin and feed them to mice susceptible to cholera. C) Feed pieces of raw potato to susceptible mice and test them for antibodies. D) Emulsify the potatoes in a liquid that can be injected into experimental animals.