Botulinum toxin- A toxin produced by the bacterium Clostridium botulinum.Known for sometimes lethal poisoning from infected meat products. In modern controlled medical or cosmetic use, the very same toxin is known as Botox.Tetanus toxin- Another very potent neurotoxin produced by Clostridium tetani.Strichnine- A highly poisonous alkaloid produced by the Strychnos nux-vomica tree,historically used to kill rats and other pests.Another toxin that also blocks neurotransmitter release is tetanus toxin; however, it primarily affects inhibitory interneurons of the spinal cord that negatively regulate motor neurons. Which would be symptoms of tetanus toxin poisoning?
A. Slowed action potential conduction
B. Flaccid paralysis
C. Pupil dilation
D. Spastic paralysis
Answer: D
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Packaged food in the United States must have a nutrition label, but there is not a requirement that genetically modified food be labeled as such. Should food producers and distributers be required to identify products made from genetically modified plants or livestock?
1.Yes. I do not want to purchase or eat food that is not natural, and should be given all the information I need to make that choice for myself. 2.No. There is no scientific evidence that genetically modified organisms are harmful to humans. The technology allows us to better produce foods without the use of pesticides and herbicides, which can be harmful to human health. Therefore, it is not worth the added cost of requiring new labeling
What is one difference between DNA replication in bacteria versus eukaryotes?
A) Eukaryotic chromosomes are replicated bidirectionally, while bacterial chromosomes are replicated in one direction. B) Eukaryotic chromosomes have many origins of replication and replicate bidirectionally, while bacteria have only one origin of replication and replicate unidirectionally. C) Bacterial chromosomes are replicated bidirectionally, while eukaryotic chromosomes are replicated in one direction. D) Eukaryotic chromosomes have many origins of replication, while bacteria have only one origin of replication. E) The process is identical in bacterial and eukaryotic DNA replication.
Answer the following statements true (T) or false (F)
1. One outcome of gastrulation is the establishment of primordial germ cells, which represent the cell types that form gametes. 2. The differentiation of cells into distinct body parts is induced by morphogens. 3. Human embryos are called morula when compaction occurs. 4. Human eggs undergo holoblastic cleavage and compaction during development.
When you prune the tips off of branches, the
plant tends to become more shrubby, this is due to
a. apical dominance release. b. removal of auxin. c. increased levels of cytokinin. d. the development of lateral shoots. e. a combination of all of these factors.