Which of the following is a disease caused by a pleiotropic gene?
a. sickle-cell anemia
b. pernicious anemia
c. aplastic anemia
d. iron deficiency anemia
e. hemolytic anemia
A
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The study of fungi is called ____
a. ecology b. botany c. mycology d. microbiology e. parasitology
A woman is diagnosed to have a gene for the genetic
disorder known as Huntington disease. It is a rare defect caused by an autosomal dominant allele. The chance for any one of her children to inherit the gene is a. dependent on the sex of the child. b. 1/3. c. 1/2. d. 3/4. e. 1.00 (or 100 percent).
Which of the following statements about El Niño are true?
A. Occurrence of El Niño is irregular and unpredictable. B. El Niño events in the Pacific can influence weather as far away as Africa. C. The immediate effect of El Niño is a weakening in the east-to-west trade winds D. Weakening in the trade winds results in more upwelling along the Peru-Ecuador coast. E. El Niño results in the movement of weather systems from the western Pacific eastward.
Which of the following events will occur in response to gravitropism?
A. The guard cells will swell with water due to an increase in sodium ions which will cause the plant to grow upright. B. Because of the change in the plant's position, it will have sediments of statoliths (amyloplasts containing starch granules) settle towards the lower side of the stems and roots and come into contact with the cytoskeletal elements. C. The stems on the shady side of the plant will elongate due to the presence of auxin. D. The tendril of the plant will coil around any type of substrate that it comes into contact with.