A biologist discovers a new species of organism adapted to living in a deep underground cavern that provides no source of free water. The organism is eyeless and covered by fur, and it has a four chambered heart with a closed circulatory system. What excretory system adaptations to this extreme environment might the biologist expect to find?
A. very long malpighian tubules
B. very short malpighian tubules
C. metanephridia with a large number of nephridiopores
D. nephrons with long loops of Henle
E. nephrons with short loops of Henle
D. nephrons with long loops of Henle
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A human female with only one X chromosome is said to have a condition called
A. X chromosome inactivation. B. Angelman syndrome. C. Turner syndrome. D. Klinefelter syndrome. E. Down syndrome.
A recombinant DNA was constructed by inserting the DNA of interest into the AmpR gene of a pBR322 vector. The vector also contains a TetR gene that is not interrupted
After introducing the recombinant DNA into bacterial cells, the resulting transformants were tested on a variety of media. Which of the following results would be expected? A. growth on both ampicillin containing media and tetracycline containing media B. growth on ampicillin but not tetracycline containing media C. growth on tetracycline but not ampicillin containing media D. no growth on either ampicillin or tetracycline containing media E. growth only on media containing both antibiotics
Which period was unusually dry, giving seed plants an evolutionary advantage over previously dominant seedless plants?
a. Pennsylvanian b. Mississippian c. Permian d. Devonian
Which of the following relationships is FALSE?
A) Ribosomes-site of protein synthesis B) Cell wall-support and protection C) Mitochondria-formation of ATP D) Chloroplasts-chief site of lipid synthesis E) Nucleus-genetic information