One of the lines of evidence supporting the theory that modern humans originated in Africa is that the modern-day human population of Africa contains the greatest diversity of genetic variants of any human population
Why is this consistent with the idea that humans first evolved in Africa?
The reasoning is that populations arising in and anciently occupying an area will have had more time to accumulate genetic variants. Derivative populations migrating elsewhere would experience a founder effect, which would lead to loss of some variation.
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The sinoatrial node is located in the ____
a. left atrium b. left ventricle c. pulmonary artery d. right atrium e. right ventricle
Who was the first person to apply antiseptic techniques during surgery?
A. Ignatz Semmelweis B. Louis Pasteur C. Robert Hook D. Joseph Lister E. Paul Ehrlich
Tannins are chemicals that help plants repel invaders by
A. over-stimulating the predator. B. binding to proteins and thereby disrupting the predator's digestion. C. injuring the external covering of the predator's body. D. causing the predator to grow so rapidly that it dies. E. sedating the predator.
Place the steps in the correct order to reflect how a lethal dose may be determined.1. Dilutions of virus are made to represent a range of concentrations.2. Dilutions are inoculated into susceptible tissue cultures (or susceptible host organisms).3. Inoculated host cells are observed and the number of dead cells are counted.4. The dilution which killed 50% of the tissue culture cells is identified.
Fill in the blank(s) with the appropriate word(s).