The Centers for Disease Control and Prevention assigns the most virulent microbes known to cause human disease to biosafety level 4.
Answer the following statement true (T) or false (F)
True
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Hybridization between different species is rare because it ____
a. requires the breakdown of a barrier preventing interbreeding b. causes lethal mutations in hybrid offspring c. leads to the exchange of genes between closely related species
d. leads to gene flow between species e. contradicts the species concept
Cerebrospinal fluid ____
a. bathes the peripheral nervous system b. is continuous with the lymph system c. is formed from water and solutes that have left capillaries in the brain d. is the solvent that comprises the cytosol of neurons e. is stored in the ventricles
The diagram below shows a cell with three different membrane transport proteins. The Na+/K+ Pump is a primary active transporter and the Na+/Waste Co-transporter is a secondary active transporter. Arrows show the direction of net movement of molecules through the Pump and Co-transporter. The Na+ Channel can exist in either a closed state (no Na+ can pass through) or an open state (Na+ can pass through). Use this diagram to answer the questions below. What will happen to the net movement of Waste molecules if the Na+/K+ Pump stops working?
a) Net movement of Waste out of the cell will continue indefinitely (nothing will change) b) Net movement of Waste out of the cell will continue for some time and then Waste will be transported into the cell c) All net movement of Waste in or out of the cell will stop immediately d) Net movement of Waste out of the cell will stop immediately and then Waste will be transported into the cell e) Net movement of Waste out of the cell will continue for some time and then all net movement of Waste in or out of the cell will stop
If a person were to receive such a high dose of radiation that all of the cells were to die in this area, anemia would develop. This place is the ________
A) lymph nodes B) red bone marrow C) thymus D) yellow bone marrow