Which of these describes antagonistic pleiotropy?
A. The later in life that a mutation affects fitness, the weaker the selection against that mutation.
B. Mating only once in life, then dying.
C. Genes that increase reproduction may decrease survival later in life.
D. Delaying reproduction until conditions are more favorable.
E. Cellular damage that lowers survival and reproduction with age.
Answer: C. Genes that increase reproduction may decrease survival later in life.
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Which membrane is referenced in the expression "my water broke"?
a. amnion b. chorion c. chorionic villi d. placenta e. yolk sac
All of the following statements are true about restriction enzymes EXCEPT
A. hundreds of different ones have been isolated and purified. B. they are made by bacteria and viruses. C. each enzyme cuts DNA at a different specific base sequence. D. they produce single-stranded complementary ends that can join to two different DNA strands by complementary base-pairing.
A farmer decides she wants to grow certified organic corn and sets out to meet all USDA standards to do so
Her crop grows well for the first 3 years; however, she notices during the 4th and 5th years that plants are getting smaller and producing much less corn. She has not altered farming practices and begins to wonder what is happening. She remembers someone mentioning planting peanuts every 3rd year in place of a corn crop, which leads to much healthier corn. Why would a farmer want to change to a different crop, especially something like peanuts? A) Planting a legume like peanuts increases water retention in the soil, allowing the following year's corn crop to thrive. B) Crop rotation with a legume like peanuts will increase nitrogen in the soil, reducing the need for chemical fertilizer. C) Planting a legume like peanuts increases the available carbon in the soil. D) Changing from corn to peanuts, a legume, allows the soil to "rest" for a year.
How are symptoms of an infection associated with the mode of transmission of the pathogen?
A) Lack of symptoms indicates that the infection is not transmissible to others. B) The worse the patient feels, the more likely the disease is transmissible to others. C) Bodily fluids produced during an illness are often rich in infectious organisms. D) There is no relationship between symptoms and mode of transmission. E) Bodily fluids are rarely a source of disease transmission during an infection.