By some estimates, how many species are undergoing premature extinction because of human actions?
a. 6 per day
b. 10 per day
c. 1 per hour
d. 6 per hour
e. 10 per hour
ANSWER: d
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The tertiary structure of a protein is the _____
A) bonding together of several polypeptide chains by weak bonds B) order in which amino acids are joined in a polypeptide chain C) unique three-dimensional shape of the fully folded polypeptide D) organization of a polypeptide chain into an ?-helix or ?-pleated sheet E) overall protein structure resulting from the aggregation of two or more polypeptide subunits
Tuberculoid Hansen's disease is caused by the pathogen
A) Listeria monocytogenes. B) Mycobacterium leprae. C) Mycobacterium tuberculosis. D) either Mycobacterium leprae or Mycobacterium tuberculosis.
The "pin" structure of a helicase:
A. serves as a spool for the DNA. B. holds the helicase dimers in the correct position. C. allows rewinding of the DNA after transcription. D. separates the complementary strands of DNA. E. prevents a translocation mechanism.
Rhythms that are repeated every 24 hours are
a. sleep movements. b. tropisms. c. physiological requirements. d. circadian rhythms. e. biological clocks.