In a cell in which 2n = 6, the independent assortment of chromosomes during meiosis can by itself give rise to ________ genetically different gametes.
A) two
B) four
C) five
D) six
E) eight
Ans: E) eight
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Syphilis was once treated by intentionally infecting the patient with the parasite that causes malaria, a disease characterized by repeated bouts of fever, shaking, and chills
Why might this treatment cure syphilis? A. Malaria parasites produce strong antibacterial compounds (since they're eukaryotic in nature-they are trying to eliminate their competition for resources). This helps to eliminate ALL bacteria in and on the human body for a short period of time. B. Malaria parasites track down and feed upon ALL bacterial cells in the human body as a part of their life cycle. This makes them a "natural antibiotic" of sorts, and highly effective at clearing the bacterial infection of syphilis. C. One of the side effects of malarial infection is a massive overproduction of macrophages-so many that they become the dominant cell type in the blood (even over red blood cells!). This drives up the ability to ingest and destroy any microbe, including the bacterium that causes syphilis. D. The effect of driving up the body temperature for periods of time can shut down the temperature-sensitive replication of the bacterium that causes syphilis. This gives the immune system time to eliminate it properly.
Darwin's theory of evolution is supported by many modern pieces of evidence. Check all that apply.
_____ New measurements of the age of the earth. _____ An understanding of the mechanism of heredity. _____ Human population growth. _____ Comparative studies of animal structures. _____ Similarities in DNA of related species.
Foraging bees communicate with other bees in a waggle dance to give information about the food. The important cue in the dance that conveys information about the required flight direction to the food source relative to the hive-sun direction is the
A. angle between the food source and the hive in reference to the sun. B. angle between the waggle run and the vertical axis within the hive. C. angle between the waggle run in reference to the hive-sun angle. D. angle between the waggle run in reference to the direction north from the hive. E. speed of the waggle dance.
Ethanol is an inhibitor of ADH. Therefore, a
person consuming a mixed drink excretes a. less water because ADH promotes reabsorption. b. the alcohol because ADH cannot degrade it. c. ketone bodies formed from the alcohol. d. more water because ADH normally promotes reabsorption. e. more water plus the alcohol due to the ADH inhibition.