In a typical adult human about 180 L of fluid leaves the blood as filtrate each day. How much is reabsorbed?
a. about 50%
b. about 65%
c. about 90%
d. more than 99%
Ans: d. more than 99%
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Four of the following statements about snakes are true. Which statement is false?
a. All snakes are carnivores. b. All snakes use internal fertilization. c. All snakes are venomous. d. All snakes have flexible skull bones and hinged jaws. e. Some snakes retain skeletal remnants of hind limbs.
Four of the five answers listed below are caused by recessive genes. Select the exception
a. Huntington's disorder b. phenylketonuria c. color blindness d. hemophilia e. albinism
Taxonomy is the science of:
a. making new biological species. b. generating cladograms that represent evolutionary relationships between organisms. c. naming, describing, and classifying organisms. d. conserving biodiversity. e. comparing macromolecules to assess evolutionary relationships
A 30-year-old woman has a 1 in 3,000 chance of giving birth to a child with trisomy 21; however, a 48-year-old woman has a 1 in 9 chance. Which statement is the most likely explanation for why a woman has a higher probability of giving birth to a child with trisomy 21 as she ages?
a. Older women are more likely to mate with older men, and the older the man, the older the sperm. Older sperm are more likely to experience a non disjunction event during meiosis. B. Older women have older oocytes, and the older the oocytes, the greater the chance they will experience a nondisjunction event during meiosis. C. Older women have lived longer and have an increased percentage of toxins and oxidative damage in their bodies. Because these are the major causes of trisomy 21, the likelihood of giving birth to a child with trisomy 21 increases. D. Older women have older oocytes, and the older the oocytes, the greater the chance they will experience failure of cytokinesis during cell division.